diff --git a/changelog.d/mo-ssp.added.md b/changelog.d/mo-ssp.added.md
new file mode 100644
index 00000000000..1a5b2b6f0ab
--- /dev/null
+++ b/changelog.d/mo-ssp.added.md
@@ -0,0 +1 @@
+Implement Missouri State Supplementary Payment (SAB and SNC components) under DSS Family Support Division.
diff --git a/policyengine_us/parameters/gov/household/household_state_benefits.yaml b/policyengine_us/parameters/gov/household/household_state_benefits.yaml
index b74241a36b5..a3b239baca6 100644
--- a/policyengine_us/parameters/gov/household/household_state_benefits.yaml
+++ b/policyengine_us/parameters/gov/household/household_state_benefits.yaml
@@ -12,6 +12,8 @@ values:
     - ga_ssp
     # Maine benefits
     - me_ssp
+    # Missouri benefits
+    - mo_ssp
     # Massachusetts benefits
     - ma_state_supplement
     # Michigan benefits
@@ -79,6 +81,8 @@ values:
     - ga_ssp
     # Maine benefits
     - me_ssp
+    # Missouri benefits
+    - mo_ssp
     # Massachusetts benefits
     - ma_state_supplement
     # Michigan benefits
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/age_threshold/sab.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/age_threshold/sab.yaml
new file mode 100644
index 00000000000..d06f98ce569
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/age_threshold/sab.yaml
@@ -0,0 +1,12 @@
+description: Missouri sets this age as the minimum age for eligibility under the Supplemental Aid to the Blind program.
+values:
+  1900-01-01: 18
+metadata:
+  unit: year
+  period: year
+  label: Missouri SAB minimum age
+  reference:
+    - title: RSMo § 209.030 — Aid to the blind eligibility (age 18+)
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=209.030
+    - title: RSMo § 208.030(4) — Aid to the blind supplemental payments
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/age_threshold/snc.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/age_threshold/snc.yaml
new file mode 100644
index 00000000000..dd856ace73e
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/age_threshold/snc.yaml
@@ -0,0 +1,10 @@
+description: Missouri sets this age as the minimum age for eligibility under the Supplemental Nursing Care program.
+values:
+  1900-01-01: 21
+metadata:
+  unit: year
+  period: year
+  label: Missouri SNC minimum age
+  reference:
+    - title: RSMo § 208.030(5) — Supplemental Nursing Care eligibility
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/sab/consolidated_standard.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/sab/consolidated_standard.yaml
new file mode 100644
index 00000000000..37815206b89
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/sab/consolidated_standard.yaml
@@ -0,0 +1,20 @@
+description: Missouri provides this amount as the consolidated standard under the Supplemental Aid to the Blind program.
+values:
+  2011-01-01: 510
+  2023-07-01: 789
+  2024-07-01: 828
+  2025-07-01: 917
+  2026-01-01: 1_073
+metadata:
+  unit: currency-USD
+  period: month
+  label: Missouri SAB consolidated standard
+  reference:
+    - title: 13 CSR 40-2.120(3) — Methods Used to Determine the Amount of Cash Payments
+      href: https://www.law.cornell.edu/regulations/missouri/13-CSR-40-2-120
+    - title: RSMo § 208.030(4) — Aid to the blind supplemental payments
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
+    - title: MO DSS MHABD Appendix J — SAB consolidated standard
+      href: https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=2
+    - title: SSA State Assistance Programs for SSI Recipients, January 2011 — Missouri
+      href: https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/sab/maximum_payment.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/sab/maximum_payment.yaml
new file mode 100644
index 00000000000..dfc3cc2a9a6
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/sab/maximum_payment.yaml
@@ -0,0 +1,23 @@
+description: Missouri provides this amount as the maximum payment under the Supplemental Aid to the Blind program.
+values:
+  2011-01-01: 510
+  2023-07-01: 789
+  2024-07-01: 828
+  2025-07-01: 917
+metadata:
+  unit: currency-USD
+  period: month
+  label: Missouri SAB maximum payment
+  reference:
+    - title: RSMo § 208.030(4) — Aid to the blind supplemental payments
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
+    - title: RSMo § 209.040 — Blind Pension grant amount
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=209.040
+    - title: 13 CSR 40-2.130(2) — Maximum Supplemental Aid to the Blind Payments
+      href: https://www.law.cornell.edu/regulations/missouri/13-CSR-40-2-130
+    - title: MO DSS Family Support Manual § 0415.005.00 — Maximum and Minimum Payments
+      href: https://dssmanuals.mo.gov/supplemental-aid-to-the-blind/0415-000-00/0415-005-00/
+    - title: MO DSS MHABD Appendix K — Supplemental Aid to the Blind grant amount
+      href: https://dssmanuals.mo.gov/wp-content/uploads/2018/10/appendix_k.pdf#page=5
+    - title: SSA State Assistance Programs for SSI Recipients, January 2011 — Missouri
+      href: https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/rcf_level_i.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/rcf_level_i.yaml
new file mode 100644
index 00000000000..7b248f9be2b
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/rcf_level_i.yaml
@@ -0,0 +1,12 @@
+description: Missouri provides this amount as the maximum monthly grant for a recipient residing in a Residential Care Facility Level I under the Supplemental Nursing Care program.
+values:
+  2000-07-01: 156
+metadata:
+  unit: currency-USD
+  period: month
+  label: Missouri SNC RCF Level I maximum grant
+  reference:
+    - title: MO DSS MHABD Appendix J — SNC maximum grants
+      href: https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4
+    - title: RSMo § 208.030(5) — Supplemental Nursing Care
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/rcf_level_ii_or_alf.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/rcf_level_ii_or_alf.yaml
new file mode 100644
index 00000000000..103ecf6f2aa
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/rcf_level_ii_or_alf.yaml
@@ -0,0 +1,12 @@
+description: Missouri provides this amount as the maximum monthly grant for a recipient residing in a Residential Care Facility Level II or Assisted Living Facility under the Supplemental Nursing Care program.
+values:
+  2000-07-01: 292
+metadata:
+  unit: currency-USD
+  period: month
+  label: Missouri SNC RCF Level II or ALF maximum grant
+  reference:
+    - title: MO DSS MHABD Appendix J — SNC maximum grants
+      href: https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4
+    - title: RSMo § 208.030(5) — Supplemental Nursing Care
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/snf_or_icf_non_medicaid.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/snf_or_icf_non_medicaid.yaml
new file mode 100644
index 00000000000..0f40c3e5a1f
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/max_grant/snf_or_icf_non_medicaid.yaml
@@ -0,0 +1,12 @@
+description: Missouri provides this amount as the maximum monthly grant for a recipient residing in a non-Medicaid Skilled Nursing Facility or Intermediate Care Facility under the Supplemental Nursing Care program.
+values:
+  2000-07-01: 390
+metadata:
+  unit: currency-USD
+  period: month
+  label: Missouri SNC SNF or ICF non-Medicaid maximum grant
+  reference:
+    - title: MO DSS MHABD Appendix J — SNC maximum grants
+      href: https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4
+    - title: RSMo § 208.030(5) — Supplemental Nursing Care
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
diff --git a/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/personal_needs_allowance.yaml b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/personal_needs_allowance.yaml
new file mode 100644
index 00000000000..924e1d0c8df
--- /dev/null
+++ b/policyengine_us/parameters/gov/states/mo/dss/ssp/snc/personal_needs_allowance.yaml
@@ -0,0 +1,13 @@
+description: Missouri provides this amount as the additional monthly Personal Needs Allowance for recipients of the Supplemental Nursing Care program.
+values:
+  2000-07-01: 0
+  2015-01-01: 50
+metadata:
+  unit: currency-USD
+  period: month
+  label: Missouri SNC personal needs allowance
+  reference:
+    - title: MO DSS MHABD Appendix J — Personal Needs Allowance
+      href: https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4
+    - title: RSMo § 208.030(5) — Supplemental Nursing Care personal needs allowance
+      href: https://revisor.mo.gov/main/OneSection.aspx?section=208.030
diff --git a/policyengine_us/programs.yaml b/policyengine_us/programs.yaml
index 76b5377b5f3..1d54e0b156f 100644
--- a/policyengine_us/programs.yaml
+++ b/policyengine_us/programs.yaml
@@ -712,6 +712,13 @@ programs:
         name: Maine SSP
         full_name: Maine State Supplemental Income Program
         variable: me_ssp
+      - state: MO
+        status: complete
+        name: Missouri SSP
+        full_name: Missouri State Supplementary Payment
+        variable: mo_ssp
+        parameter_prefix: gov.states.mo.dss.ssp
+        verified_years: "2023-2026"
       - state: KS
         status: complete
         name: Kansas SSPP
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/integration.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/integration.yaml
new file mode 100644
index 00000000000..2b7b5b6e8f6
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/integration.yaml
@@ -0,0 +1,262 @@
+- name: Case 1, blind Missouri adult with low SSI receives SAB grant.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        is_ssi_disabled: true
+        ssi: 2_400  # $200/month annualized
+        mo_ssp_living_arrangement: SAB
+    tax_units:
+      tax_unit:
+        members: [person1]
+    marital_units:
+      marital_unit:
+        members: [person1]
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 maximum SAB payment $917 - $200 SSI = $717.
+    mo_ssp_eligible: true
+    mo_ssp: 717
+    # SAB pathway: no PNA add-on.
+    mo_ssp_personal_needs_allowance: 0
+    # spm_unit and household aggregation passes mo_ssp through.
+    household_state_benefits: 717
+
+- name: Case 2, aged Missouri resident in SNF non-Medicaid receives SNC plus PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 75
+        is_ssi_aged: true
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    tax_units:
+      tax_unit:
+        members: [person1]
+    marital_units:
+      marital_unit:
+        members: [person1]
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC SNF base $390 + $50 PNA = $440.
+    mo_ssp_eligible: true
+    mo_ssp_personal_needs_allowance: 50
+    mo_ssp: 440
+    household_state_benefits: 440
+
+- name: Case 3, disabled Missouri resident in RCF Level II receives flat SNC amount.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 60
+        is_ssi_disabled: true
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+        mo_snc_facility_base_charge: 1_000
+    tax_units:
+      tax_unit:
+        members: [person1]
+    marital_units:
+      marital_unit:
+        members: [person1]
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_eligible: true
+    # SNC RCF Level II/ALF $292 + PNA $50 = $342.
+    mo_ssp: 342
+    mo_ssp_personal_needs_allowance: 50
+    household_state_benefits: 342
+
+- name: Case 4, non-Missouri resident with same SAB inputs receives nothing.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        is_ssi_disabled: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    tax_units:
+      tax_unit:
+        members: [person1]
+    marital_units:
+      marital_unit:
+        members: [person1]
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: KS
+  output:
+    # defined_for = StateCode.MO zeroes out non-MO output.
+    mo_ssp_eligible: false
+    mo_ssp: 0
+    household_state_benefits: 0
+
+- name: Case 5, FY2025 Missouri couple with one blind spouse receiving SSI.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 65
+        is_blind: true
+        is_ssi_aged: true
+        ssi: 2_400  # $200/month annualized
+        mo_ssp_living_arrangement: SAB
+      person2:
+        age: 63
+        is_ssi_aged: true
+        ssi: 0
+        mo_ssp_living_arrangement: NONE
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+    marital_units:
+      marital_unit:
+        members: [person1, person2]
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    households:
+      household:
+        members: [person1, person2]
+        state_code: MO
+  output:
+    # FY2025 maximum SAB payment $828 - $200 = $628 for blind spouse.
+    # Other spouse: ssi == 0 and arrangement NONE => not eligible => $0.
+    mo_ssp_eligible: [true, false]
+    mo_ssp: [628, 0]
+    # household_state_benefits is YEAR; in 2025 there's a FY transition at
+    # 2025-07-01 (FY2025 -> FY2026). Jan-Jun: $628/mo; Jul-Dec: $717/mo.
+    # Annual = 6*628 + 6*717 = 8,070; monthly average = 672.5.
+    household_state_benefits: 672.5
+
+- name: Case 6, FY2024 SNF non-Medicaid resident.
+  period: 2024-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 80
+        is_ssi_aged: true
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    tax_units:
+      tax_unit:
+        members: [person1]
+    marital_units:
+      marital_unit:
+        members: [person1]
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC values frozen since 2000-07-01: $390 base + $50 PNA = $440.
+    mo_ssp_eligible: true
+    mo_ssp: 440
+    mo_ssp_personal_needs_allowance: 50
+    household_state_benefits: 440
+
+- name: Case 7, Missouri adult age 22 disabled in RCF Level I receives flat amount.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 22
+        is_ssi_disabled: true
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    tax_units:
+      tax_unit:
+        members: [person1]
+    marital_units:
+      marital_unit:
+        members: [person1]
+    spm_units:
+      spm_unit:
+        members: [person1]
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC RCF Level I $156 + PNA $50 = $206.
+    mo_ssp_eligible: true
+    mo_ssp: 206
+    mo_ssp_personal_needs_allowance: 50
+    household_state_benefits: 206
+
+- name: Case 8, Missouri couple both eligible in RCF Level II each receive the per-person amount.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 65
+        is_ssi_aged: true
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+        mo_snc_facility_base_charge: 1_000
+      person2:
+        age: 65
+        is_ssi_aged: true
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+        mo_snc_facility_base_charge: 1_000
+    tax_units:
+      tax_unit:
+        members: [person1, person2]
+    marital_units:
+      marital_unit:
+        members: [person1, person2]
+    spm_units:
+      spm_unit:
+        members: [person1, person2]
+    households:
+      household:
+        members: [person1, person2]
+        state_code: MO
+  output:
+    # SNC formula is per-person; both spouses eligible so each gets
+    # $292 base + $50 PNA = $342, and the spm_unit total is 2 x $342 = $684.
+    mo_ssp_eligible: [true, true]
+    mo_ssp: [342, 342]
+    household_state_benefits: 684
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_sab_countable_income.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_sab_countable_income.yaml
new file mode 100644
index 00000000000..5b847b795a5
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_sab_countable_income.yaml
@@ -0,0 +1,45 @@
+- name: Zero income gives zero SAB countable income.
+  period: 2026
+  input:
+    people:
+      person1:
+        age: 50
+        employment_income: 0
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_sab_countable_income: 0
+
+- name: $12,000 annual employment income gives ~$5,490 annual SAB countable income after SSI-style exclusions.
+  period: 2026
+  input:
+    people:
+      person1:
+        age: 50
+        employment_income: 12_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Monthly earned = $1,000. After $20 general + $65 earned exclusion =
+    # $915, then 50% remainder = $457.50/month, annualized to $5,490.
+    mo_sab_countable_income: 5_490
+
+- name: $30,000 annual employment income gives ~$14,490 annual SAB countable income.
+  period: 2026
+  input:
+    people:
+      person1:
+        age: 50
+        employment_income: 30_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Monthly earned = $2,500. After $20 + $65 = $2,415, then 50% = $1,207.50,
+    # annualized to $14,490. Monthly $1,207.50 exceeds $1,073 SAB limit.
+    mo_sab_countable_income: 14_490
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp.yaml
new file mode 100644
index 00000000000..2b2dea1deb9
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp.yaml
@@ -0,0 +1,480 @@
+- name: Case 1, SAB recipient with low SSI receives maximum payment minus SSI.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 2_400  # $200/month annualized; SSI is YEAR-defined
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 maximum SAB payment $917 - $200 SSI = $717.
+    mo_ssp: 717
+
+- name: Case 2, SAB recipient with SSI above the maximum payment gets zero.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 11_604  # $967/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 maximum SAB payment $917; max(917 - 967, 0) = 0.
+    mo_ssp: 0
+
+- name: Case 3, SAB recipient with $1 SSI receives maximum payment minus SSI.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 12  # $1/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 maximum SAB payment $917 - $1 SSI = $916.
+    mo_ssp: 916
+
+- name: Case 3b, SAB applicant with no SSI receives the full maximum payment.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 0
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 maximum SAB payment $917 - $0 SSI = $917.
+    mo_ssp: 917
+
+- name: Case 4, SNC RCF Level I recipient receives flat amount plus PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC RCF Level I $156 + PNA $50 = $206.
+    mo_ssp: 206
+
+- name: Case 5, SNC RCF Level II or ALF recipient receives flat amount plus PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC RCF Level II or ALF $292 + PNA $50 = $342.
+    mo_ssp: 342
+
+- name: Case 6, SNC SNF non-Medicaid resident receives base plus PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC SNF/ICF base $390 plus PNA $50 = $440.
+    mo_ssp: 440
+
+- name: Case 7, person not in Missouri receives zero.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: KS
+  output:
+    # defined_for = StateCode.MO filters output to zero.
+    mo_ssp: 0
+
+- name: Case 8, SNC applicant with no SSI but income below facility charge gets a grant.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 0
+        social_security: 14_400  # $1,200/month annualized
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_300
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC need: $1,300 - $1,200 = $100, below the $156 RCF Level I cap.
+    # Plus $50 PNA (paid to all SNC tiers). $100 + $50 = $150.
+    mo_ssp: 150
+
+- name: Case 9, FY2024 SAB recipient with $0.50 SSI rounds to the nearest dollar.
+  period: 2024-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 0.5
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2024 maximum SAB payment $789 - $0.50 SSI = $788.50, rounded to $789.
+    mo_ssp: 789
+
+- name: Case 10, child under 18 in SAB arrangement is not eligible.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 16
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Age below SAB threshold (18) => mo_ssp_age_eligible false.
+    mo_ssp: 0
+
+- name: Case 11, person in NONE arrangement receives zero.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: NONE
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # NONE arrangement is not category-eligible.
+    mo_ssp: 0
+
+- name: Case 12, FY2025 SAB recipient with low SSI uses FY2025 maximum payment.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 2_400  # $200/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2025 maximum SAB payment $828 - $200 SSI = $628.
+    mo_ssp: 628
+
+- name: Case 13, FY2025 SAB grant with nominal SSI uses maximum payment minus SSI.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 12  # $1/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2025 maximum SAB payment $828 - $1 SSI = $827.
+    mo_ssp: 827
+
+- name: Case 14, FY2025 SAB grant with SSI 200 uses maximum payment minus SSI.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 2_400  # $200/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2025 maximum SAB payment $828 - $200 SSI = $628.
+    mo_ssp: 628
+
+- name: Case 15, FY2025 SAB grant with SSI exactly equal to maximum payment is zero.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 9_936  # $828/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2025 maximum SAB payment $828; max(828 - 828, 0) = 0.
+    mo_ssp: 0
+
+- name: Case 16, FY2025 SAB grant with SSI exceeding maximum payment is zero.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 12_000  # $1,000/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2025 maximum SAB payment $828; max(828 - 1000, 0) = 0.
+    mo_ssp: 0
+
+- name: Case 17, negative self-employment income does not inflate SAB benefit.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 12  # $1/month annualized
+        self_employment_income: -60_000_000
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # mo_ssp formula reads ssi only. Negative SE income cannot inflate output;
+    # benefit is bounded by max(maximum payment - ssi, 0) = $827.
+    mo_ssp: 827
+
+- name: Case 18, FY2024 SAB grant with nominal SSI uses maximum payment minus SSI.
+  period: 2024-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 12  # $1/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2024 maximum SAB payment $789 - $1 SSI = $788.
+    mo_ssp: 788
+
+- name: Case 18b, FY2026 SAB grant with sub-dollar remainder uses minimum payment.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 11_000.4  # $916.70/month annualized
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # 13 CSR 40-2.130 gives a $1 payment when the SAB remainder is positive
+    # but below 50 cents; $917 - $916.70 = $0.30, so payment is $1.
+    mo_ssp: 1
+
+- name: Case 19, SNF resident before PNA effective date receives base only.
+  period: 2014-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # PNA effective 2015-01-01; pre-effective period gives SNF base $390 + $0 PNA.
+    mo_ssp: 390
+
+- name: Case 20, SNF resident at PNA effective date receives base plus PNA.
+  period: 2015-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC SNF/ICF base $390 + PNA $50 effective 2015-01-01 = $440.
+    mo_ssp: 440
+
+- name: Case 21, resident in a Medicaid facility receives zero.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: NONE
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # MOSSPLivingArrangement has no enum value for Title XIX Medicaid
+    # facilities; residents of those facilities are recorded as NONE and
+    # excluded from category eligibility, so SNC pays nothing.
+    mo_ssp: 0
+
+- name: Case 22, intermediate care without LOC determination receives $342 (RCF II rate plus PNA).
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: INTERMEDIATE_OR_SKILLED_NO_LOC
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Intermediate or skilled facility without level-of-care determination
+    # is paid the same SNC rate as RCF Level II / ALF = $292, plus PNA $50.
+    mo_ssp: 342
+
+- name: Case 23, RCF Level I resident with OASDI and partial SSI has no SNC need.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        is_ssi_aged: true
+        social_security: 914 * 12
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # $914 OASDI + $100 SSI = $1,014 income, above the $1,000 facility base
+    # charge, so the SNC need test fails.
+    ssi: 100
+    mo_ssp_eligible: false
+    mo_ssp: 0
+
+- name: Case 24, RCF Level I resident with OASDI and partial SSI has partial SNC need.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        is_ssi_aged: true
+        social_security: 914 * 12
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_100
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # $1,100 facility base charge - $1,014 income = $86 SNC grant, plus $50 PNA.
+    ssi: 100
+    mo_ssp_eligible: true
+    mo_ssp: 136
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_age_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_age_eligible.yaml
new file mode 100644
index 00000000000..dcab31e7c89
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_age_eligible.yaml
@@ -0,0 +1,113 @@
+- name: SAB age 17 is below the 18+ threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 17
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: false
+
+- name: SAB age 18 exactly meets the threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 18
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: true
+
+- name: SAB age 19 is above the threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 19
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: true
+
+- name: SNC RCF_LEVEL_I age 20 is below the 21+ threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 20
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: false
+
+- name: SNC RCF_LEVEL_I age 21 exactly meets the threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 21
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: true
+
+- name: SNC RCF_LEVEL_II_OR_ALF age 21 meets the threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 21
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: true
+
+- name: SNC SNF_OR_ICF_NON_MEDICAID age 21 meets the threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 21
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_age_eligible: true
+
+- name: NONE arrangement at age 21 falls to the SNC 21+ threshold and passes.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 21
+        mo_ssp_living_arrangement: NONE
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Non-SAB arrangements use the SNC threshold; the category gate (tested
+    # separately in mo_ssp_category_eligible) rejects NONE downstream.
+    mo_ssp_age_eligible: true
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_category_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_category_eligible.yaml
new file mode 100644
index 00000000000..169a10c2afc
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_category_eligible.yaml
@@ -0,0 +1,132 @@
+- name: SAB pathway with is_blind=true is category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: true
+
+- name: SAB pathway with is_blind=false is not category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: false
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: false
+
+- name: SNC RCF_LEVEL_I aged resident is category-eligible without blindness.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        is_blind: false
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: true
+
+- name: SNC RCF_LEVEL_I resident who is not aged, blind, or disabled is not category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: false
+        is_disabled: false
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: false
+
+- name: SNC RCF_LEVEL_I disabled resident is category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_disabled: true
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: true
+
+- name: SNC RCF_LEVEL_II_OR_ALF is category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: true
+
+- name: SNC INTERMEDIATE_OR_SKILLED_NO_LOC is category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        mo_ssp_living_arrangement: INTERMEDIATE_OR_SKILLED_NO_LOC
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: true
+
+- name: SNC SNF_OR_ICF_NON_MEDICAID is category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: true
+
+- name: NONE arrangement is not category-eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        is_blind: true
+        mo_ssp_living_arrangement: NONE
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_category_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_eligible.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_eligible.yaml
new file mode 100644
index 00000000000..d04cb868a23
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_eligible.yaml
@@ -0,0 +1,354 @@
+- name: Case 1, blind adult receiving SSI in MO with SAB arrangement is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_eligible: true
+
+- name: Case 1b, blind adult with no SSI in MO with SAB arrangement is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 0
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SAB can be paid even when SSI is zero; the claimant must apply for or
+    # receive SSI, but that application requirement is not modeled.
+    mo_ssp_eligible: true
+
+- name: Case 2, SNC applicant with income above the facility base charge is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 0
+        social_security: 18_000  # $1,500/month annualized
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_300
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC need test fails: $1,500 countable income exceeds $1,300 facility
+    # base charge, so no SNC grant is payable regardless of SSI receipt.
+    mo_ssp_eligible: false
+
+- name: Case 2b, SNC applicant with no SSI but income below the facility charge is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 0
+        social_security: 14_400  # $1,200/month annualized
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_300
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC need test passes: $1,200 countable income is below the $1,300
+    # facility base charge. SSI receipt is not required — the facility-cost
+    # need test handles SNC income eligibility.
+    mo_ssp_eligible: true
+
+- name: Case 3, adult receiving SSI not in MO is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: KS
+  output:
+    # defined_for = StateCode.MO filters non-MO residents.
+    mo_ssp_eligible: false
+
+- name: Case 4, child age 17 receiving SSI in SAB arrangement is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 17
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Below SAB age threshold of 18.
+    mo_ssp_eligible: false
+
+- name: Case 5, adult receiving SSI in NONE arrangement is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: NONE
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # NONE arrangement => not category-eligible.
+    mo_ssp_eligible: false
+
+- name: Case 6, adult age 19 with SAB arrangement is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 19
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SAB threshold is 18, so 19 qualifies.
+    mo_ssp_eligible: true
+
+- name: Case 7, adult age 20 in RCF Level I is not eligible due to SNC age threshold.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 20
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC categories require age 21+.
+    mo_ssp_eligible: false
+
+- name: Case 8, non-blind adult in SAB arrangement is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: false
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SAB pathway requires is_blind.
+    mo_ssp_eligible: false
+
+- name: Case 9, disabled adult age 21 in SNF non-Medicaid is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 21
+        is_disabled: true
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Exactly meets SNC age threshold and the ABD category requirement.
+    mo_ssp_eligible: true
+
+- name: Case 10, adult exactly age 18 with SAB arrangement is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 18
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Exactly meets SAB age threshold of 18.
+    mo_ssp_eligible: true
+
+- name: Case 11, disabled adult exactly age 21 with RCF Level I is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 21
+        is_disabled: true
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Exactly meets SNC age threshold of 21 and the ABD category requirement.
+    mo_ssp_eligible: true
+
+- name: Case 12, adult age 20 in RCF Level I is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 20
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SNC categories require age 21+; 20 is below threshold.
+    mo_ssp_eligible: false
+
+- name: Case 13, adult age 17 in SAB arrangement is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 17
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SAB requires age 18+; 17 is below threshold.
+    mo_ssp_eligible: false
+
+- name: Case 14, adult with nominal SSI receipt is still eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 0.01
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # SAB eligibility is independent of SSI receipt; nominal SSI does not
+    # affect this — the SAB income test uses mo_sab_countable_income against
+    # the consolidated standard.
+    mo_ssp_eligible: true
+
+- name: Case 15, adult with valid eligibility outside Missouri is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: OK
+  output:
+    # defined_for = StateCode.MO filters non-MO residents to false.
+    mo_ssp_eligible: false
+
+- name: Case 16, SAB applicant with countable income above the monthly limit is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 200
+        employment_income: 30_000
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 SAB monthly income limit $1,073; mo_sab_countable_income for
+    # blind earner with $30,000 annual employment income exceeds the limit
+    # after SSI-style exclusions, so SAB pathway fails.
+    mo_ssp_eligible: false
+
+- name: Case 17, SAB applicant with non-SSI income at or below the monthly limit is eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 200
+        employment_income: 12_000
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # FY2026 SAB monthly income limit $1,073; mo_sab_countable_income after
+    # SSI-style exclusions ($20 general + $65 earned + 50% remainder) on
+    # $1,000 monthly earned income is ~$458/month, within the limit, so SAB
+    # pathway passes.
+    mo_ssp_eligible: true
+
+- name: Case 18, SNC resident who is not aged, blind, or disabled is not eligible.
+  period: 2026-01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: false
+        is_disabled: false
+        social_security: 600
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Facility cost exceeds income, but SNC still requires aged, blind, or
+    # disabled categorical eligibility.
+    mo_ssp_eligible: false
diff --git a/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_personal_needs_allowance.yaml b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_personal_needs_allowance.yaml
new file mode 100644
index 00000000000..3b0c47d2c24
--- /dev/null
+++ b/policyengine_us/tests/policy/baseline/gov/states/mo/dss/ssp/mo_ssp_personal_needs_allowance.yaml
@@ -0,0 +1,195 @@
+- name: Case 1, SNF non-Medicaid resident receiving SSI in MO gets PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 2, RCF Level I resident gets PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Per Appendix J page 4, PNA is paid to all SNC participants.
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 3, RCF Level II or ALF resident gets PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Per Appendix J page 4, PNA is paid to all SNC participants.
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 4, ineligible person in SNF arrangement gets zero PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 0
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # defined_for = mo_ssp_eligible filters output to zero; SNC need test
+    # fails because the (defaulted-to-zero) facility base charge does not
+    # exceed the (zero) countable income.
+    mo_ssp_personal_needs_allowance: 0
+
+- name: Case 5, SNF resident at PNA effective date gets PNA.
+  period: 2015-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # PNA effective 2015-01-01 at $50.
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 6, SNF resident before PNA effective date gets zero.
+  period: 2014-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # PNA effective 2015-01-01; pre-effective period returns 0.
+    mo_ssp_personal_needs_allowance: 0
+
+- name: Case 7, SAB arrangement returns zero PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 50
+        is_blind: true
+        ssi: 200
+        mo_ssp_living_arrangement: SAB
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # PNA only paid for SNF/ICF non-Medicaid arrangements; SAB returns 0.
+    mo_ssp_personal_needs_allowance: 0
+
+- name: Case 8, RCF Level I arrangement returns PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_I
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # Per Appendix J page 4, PNA is paid to all SNC participants.
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 9, SNF non-Medicaid arrangement returns PNA.
+  period: 2026-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: SNF_OR_ICF_NON_MEDICAID
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    # PNA $50 paid for SNF/ICF non-Medicaid arrangement.
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 10, RCF II/ALF resident gets PNA.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: RCF_LEVEL_II_OR_ALF
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_personal_needs_allowance: 50
+
+- name: Case 11, INTERMEDIATE_OR_SKILLED_NO_LOC resident gets PNA.
+  period: 2025-01
+  absolute_error_margin: 0.01
+  input:
+    people:
+      person1:
+        age: 70
+        ssi: 500
+        mo_ssp_living_arrangement: INTERMEDIATE_OR_SKILLED_NO_LOC
+        mo_snc_facility_base_charge: 1_000
+    households:
+      household:
+        members: [person1]
+        state_code: MO
+  output:
+    mo_ssp_personal_needs_allowance: 50
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/eligibility/mo_ssp_age_eligible.py b/policyengine_us/variables/gov/states/mo/dss/ssp/eligibility/mo_ssp_age_eligible.py
new file mode 100644
index 00000000000..ed389aedd2d
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/eligibility/mo_ssp_age_eligible.py
@@ -0,0 +1,24 @@
+from policyengine_us.model_api import *
+from policyengine_us.variables.gov.states.mo.dss.ssp.mo_ssp_living_arrangement import (
+    MOSSPLivingArrangement,
+)
+
+
+class mo_ssp_age_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Meets the age threshold for Missouri SSP"
+    definition_period = MONTH
+    defined_for = StateCode.MO
+    reference = (
+        "https://revisor.mo.gov/main/OneSection.aspx?section=208.030",
+        "https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html",
+    )
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.states.mo.dss.ssp.age_threshold
+        age = person("age", period.this_year)
+        living_arrangement = person("mo_ssp_living_arrangement", period)
+        is_sab = living_arrangement == MOSSPLivingArrangement.SAB
+        threshold = where(is_sab, p.sab, p.snc)
+        return age >= threshold
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/eligibility/mo_ssp_category_eligible.py b/policyengine_us/variables/gov/states/mo/dss/ssp/eligibility/mo_ssp_category_eligible.py
new file mode 100644
index 00000000000..4a0eed9580e
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/eligibility/mo_ssp_category_eligible.py
@@ -0,0 +1,33 @@
+from policyengine_us.model_api import *
+from policyengine_us.variables.gov.states.mo.dss.ssp.mo_ssp_living_arrangement import (
+    MOSSPLivingArrangement,
+)
+
+
+class mo_ssp_category_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "In a Missouri SSP covered category"
+    definition_period = MONTH
+    defined_for = StateCode.MO
+    reference = (
+        "https://revisor.mo.gov/main/OneSection.aspx?section=208.030",
+        "https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html",
+    )
+
+    def formula(person, period, parameters):
+        living_arrangement = person("mo_ssp_living_arrangement", period)
+        categories = living_arrangement.possible_values
+        in_snc_facility = (
+            (living_arrangement == categories.RCF_LEVEL_I)
+            | (living_arrangement == categories.RCF_LEVEL_II_OR_ALF)
+            | (living_arrangement == categories.INTERMEDIATE_OR_SKILLED_NO_LOC)
+            | (living_arrangement == categories.SNF_OR_ICF_NON_MEDICAID)
+        )
+        is_blind = person("is_blind", period.this_year)
+        is_aged_blind_disabled = person(
+            "is_ssi_aged_blind_disabled", period.this_year
+        )
+        sab_pathway = (living_arrangement == categories.SAB) & is_blind
+        snc_pathway = in_snc_facility & is_aged_blind_disabled
+        return snc_pathway | sab_pathway
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_sab_countable_income.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_sab_countable_income.py
new file mode 100644
index 00000000000..48f9b5d13bd
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_sab_countable_income.py
@@ -0,0 +1,52 @@
+from policyengine_us.model_api import *
+from policyengine_us.variables.gov.ssa.ssi.eligibility.income._apply_ssi_exclusions import (
+    _apply_ssi_exclusions,
+)
+
+
+class mo_sab_countable_income(Variable):
+    value_type = float
+    entity = Person
+    label = "Missouri SAB countable income"
+    unit = USD
+    definition_period = YEAR
+    defined_for = StateCode.MO
+    reference = (
+        "https://www.law.cornell.edu/regulations/missouri/13-CSR-40-2-120",
+        "https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=2",
+    )
+
+    def formula(person, period, parameters):
+        # SAB applies SSI-methodology exclusions ($20 general, $65 earned,
+        # 50% of remainder) per 13 CSR 40-2.120(3), but the income test is
+        # applied to all blind applicants — including those who would fail
+        # federal SSI on resources or immigration. Using ssi_countable_income
+        # here would zero out for non-eligibles and silently bypass the SAB
+        # income test. Appendix K p.5 specifies the test is calculated
+        # individually, regardless of marital status, so we use individual
+        # (not marital) earned/unearned variables and do not apply the
+        # couple-computation divide-by-2.
+        earned = person("ssi_earned_income", period)
+        student_exclusion = person(
+            "ssi_blind_or_disabled_working_student_exclusion", period
+        )
+        adjusted_earned = max_(earned - student_exclusion, 0)
+        # ISM (in-kind support and maintenance) is counted as unearned per
+        # 20 CFR § 416.1140 and is independent of SSI eligibility.
+        # Parent deeming (20 CFR § 416.1165) is not included because SAB is
+        # an 18+ program and the variable is gated on is_child.
+        unearned = person("ssi_unearned_income", period)
+        ism = person("ssi_in_kind_support_and_maintenance", period)
+        total_unearned = unearned + ism
+        own_countable = _apply_ssi_exclusions(
+            adjusted_earned, total_unearned, parameters, period
+        )
+        # Spousal deeming from an SSI-ineligible spouse (20 CFR § 416.1163)
+        # applies for SAB applicants who are themselves SSI-eligible. The
+        # underlying variable is gated on is_ssi_eligible_individual, so SAB
+        # applicants who fail federal SSI on resources or immigration won't
+        # get spousal deeming captured here — a narrow modeling limitation.
+        spousal_deemed = person(
+            "ssi_income_deemed_from_ineligible_spouse", period
+        )
+        return own_countable + spousal_deemed
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_snc_countable_income.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_snc_countable_income.py
new file mode 100644
index 00000000000..1fe256cb6fd
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_snc_countable_income.py
@@ -0,0 +1,20 @@
+from policyengine_us.model_api import *
+
+
+class mo_snc_countable_income(Variable):
+    value_type = float
+    entity = Person
+    label = "Missouri SNC countable income"
+    unit = USD
+    definition_period = MONTH
+    defined_for = StateCode.MO
+    documentation = (
+        "Approximates Supplemental Nursing Care countable income from modeled "
+        "cash income sources; Missouri-specific exclusions, overhead expenses, "
+        "and supported employment disregards are not modeled."
+    )
+    reference = (
+        "https://dssmanuals.mo.gov/supplemental-nursing-care/0610-000-00/0610-005-00/",
+        "https://dssmanuals.mo.gov/supplemental-nursing-care/0610-000-00/0610-025-00/",
+    )
+    adds = ["market_income", "social_security", "ssi"]
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_snc_facility_base_charge.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_snc_facility_base_charge.py
new file mode 100644
index 00000000000..f0ba9bade02
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_snc_facility_base_charge.py
@@ -0,0 +1,14 @@
+from policyengine_us.model_api import *
+
+
+class mo_snc_facility_base_charge(Variable):
+    value_type = float
+    entity = Person
+    label = "Missouri SNC facility base charge"
+    unit = USD
+    definition_period = MONTH
+    defined_for = StateCode.MO
+    reference = (
+        "https://dssmanuals.mo.gov/supplemental-nursing-care/0610-000-00/0610-025-00/",
+        "https://dssmanuals.mo.gov/wp-content/uploads/2020/10/im-72.pdf",
+    )
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp.py
new file mode 100644
index 00000000000..787285916da
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp.py
@@ -0,0 +1,56 @@
+from policyengine_us.model_api import *
+
+
+class mo_ssp(Variable):
+    value_type = float
+    entity = Person
+    label = "Missouri State Supplementary Payment"
+    unit = USD
+    definition_period = MONTH
+    defined_for = "mo_ssp_eligible"
+    reference = (
+        "https://revisor.mo.gov/main/OneSection.aspx?section=208.030",
+        "https://revisor.mo.gov/main/OneSection.aspx?section=209.040",
+        "https://www.law.cornell.edu/regulations/missouri/13-CSR-40-2-130",
+        "https://dssmanuals.mo.gov/supplemental-aid-to-the-blind/0415-000-00/0415-005-00/",
+        "https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html",
+    )
+
+    def formula(person, period, parameters):
+        # We don't model the earned-income-limit-based "most beneficial of two
+        # methods" Supplemental Aid to the Blind pathway from DSS Manual
+        # 0715.010.10 at the moment; it only applies to the closed
+        # 1973-conversion cohort.
+        p = parameters(period).gov.states.mo.dss.ssp
+        federal_ssi = person("ssi", period)
+        sab_remainder = max_(p.sab.maximum_payment - federal_ssi, 0)
+        sab_grant = where(
+            (sab_remainder > 0) & (sab_remainder < 1),
+            1,
+            np.floor(sab_remainder + 0.5),
+        )
+        living_arrangement = person("mo_ssp_living_arrangement", period)
+        categories = living_arrangement.possible_values
+        snc = p.snc.max_grant
+        snc_max_grant = select(
+            [
+                living_arrangement == categories.RCF_LEVEL_I,
+                (living_arrangement == categories.RCF_LEVEL_II_OR_ALF)
+                | (living_arrangement == categories.INTERMEDIATE_OR_SKILLED_NO_LOC),
+                living_arrangement == categories.SNF_OR_ICF_NON_MEDICAID,
+            ],
+            [
+                snc.rcf_level_i,
+                snc.rcf_level_ii_or_alf,
+                snc.snf_or_icf_non_medicaid,
+            ],
+            default=0,
+        )
+        facility_base_charge = person("mo_snc_facility_base_charge", period)
+        countable_income = person("mo_snc_countable_income", period)
+        snc_grant = min_(
+            max_(facility_base_charge - countable_income, 0),
+            snc_max_grant,
+        )
+        base = where(living_arrangement == categories.SAB, sab_grant, snc_grant)
+        return base + person("mo_ssp_personal_needs_allowance", period)
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_eligible.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_eligible.py
new file mode 100644
index 00000000000..3563ad1010a
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_eligible.py
@@ -0,0 +1,42 @@
+from policyengine_us.model_api import *
+
+
+class mo_ssp_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Eligible for the Missouri State Supplementary Payment"
+    definition_period = MONTH
+    defined_for = StateCode.MO
+    reference = (
+        "https://revisor.mo.gov/main/OneSection.aspx?section=208.030",
+        "https://www.ssa.gov/policy/docs/progdesc/ssi_st_asst/2011/mo.html",
+    )
+
+    def formula(person, period, parameters):
+        # SAB applicants must apply for SSI but the grant is paid regardless
+        # of receipt; SNC eligibility turns on the facility-cost-vs-income
+        # need test, not SSI receipt. We don't track the SAB SSI-application
+        # requirement, Missouri-specific resource limits, the closed
+        # 1973-conversion State Pension cohort, or Supplemental Nursing Care
+        # physician medical-need tests.
+        in_category = person("mo_ssp_category_eligible", period)
+        age_eligible = person("mo_ssp_age_eligible", period)
+        living_arrangement = person("mo_ssp_living_arrangement", period)
+        categories = living_arrangement.possible_values
+        is_sab = living_arrangement == categories.SAB
+        is_snc = (living_arrangement != categories.SAB) & (
+            living_arrangement != categories.NONE
+        )
+        p = parameters(period).gov.states.mo.dss.ssp
+        # mo_sab_countable_income applies SSI-style exclusions without the
+        # eligibility zero-out in ssi_countable_income — so SAB applicants
+        # who fail federal SSI on resources or immigration are still
+        # income-tested against the MO consolidated standard.
+        countable_income = person("mo_sab_countable_income", period)
+        sab_income_eligible = ~is_sab | (
+            countable_income <= p.sab.consolidated_standard
+        )
+        snc_countable_income = person("mo_snc_countable_income", period)
+        facility_base_charge = person("mo_snc_facility_base_charge", period)
+        snc_need_eligible = ~is_snc | (snc_countable_income < facility_base_charge)
+        return in_category & age_eligible & sab_income_eligible & snc_need_eligible
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_living_arrangement.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_living_arrangement.py
new file mode 100644
index 00000000000..95950943a06
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_living_arrangement.py
@@ -0,0 +1,30 @@
+from policyengine_us.model_api import *
+
+
+class MOSSPLivingArrangement(Enum):
+    SAB = "Supplemental Aid to the Blind (own home or facility)"
+    RCF_LEVEL_I = "Residential Care Facility Level I"
+    RCF_LEVEL_II_OR_ALF = (
+        "Residential Care Facility Level II or Assisted Living Facility"
+    )
+    INTERMEDIATE_OR_SKILLED_NO_LOC = (
+        "Intermediate or skilled care facility without level-of-care determination"
+    )
+    SNF_OR_ICF_NON_MEDICAID = (
+        "Skilled Nursing or Intermediate Care Facility, non-Medicaid"
+    )
+    NONE = "None of the above"
+
+
+class mo_ssp_living_arrangement(Variable):
+    value_type = Enum
+    entity = Person
+    label = "Missouri SSP living arrangement"
+    definition_period = MONTH
+    defined_for = StateCode.MO
+    possible_values = MOSSPLivingArrangement
+    default_value = MOSSPLivingArrangement.NONE
+    reference = (
+        "https://revisor.mo.gov/main/OneSection.aspx?section=208.030",
+        "https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4",
+    )
diff --git a/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_personal_needs_allowance.py b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_personal_needs_allowance.py
new file mode 100644
index 00000000000..c1c27d3fbe0
--- /dev/null
+++ b/policyengine_us/variables/gov/states/mo/dss/ssp/mo_ssp_personal_needs_allowance.py
@@ -0,0 +1,31 @@
+from policyengine_us.model_api import *
+from policyengine_us.variables.gov.states.mo.dss.ssp.mo_ssp_living_arrangement import (
+    MOSSPLivingArrangement,
+)
+
+
+class mo_ssp_personal_needs_allowance(Variable):
+    value_type = float
+    entity = Person
+    label = "Missouri SSP Personal Needs Allowance"
+    unit = USD
+    definition_period = MONTH
+    defined_for = "mo_ssp_eligible"
+    reference = (
+        "https://revisor.mo.gov/main/OneSection.aspx?section=208.030",
+        "https://dssmanuals.mo.gov/wp-content/uploads/2022/07/mhabd-appendix-j.pdf#page=4",
+    )
+
+    def formula(person, period, parameters):
+        # Per MO DSS MHABD Appendix J page 4, the PNA is paid to all SNC
+        # participants regardless of facility tier. RSMo 208.030.5 excludes the
+        # PNA when the recipient is already receiving a personal needs
+        # allowance from another state or federal program; we don't track that
+        # intake at the moment.
+        p = parameters(period).gov.states.mo.dss.ssp.snc
+        living_arrangement = person("mo_ssp_living_arrangement", period)
+        categories = MOSSPLivingArrangement
+        is_snc = (living_arrangement != categories.SAB) & (
+            living_arrangement != categories.NONE
+        )
+        return is_snc * p.personal_needs_allowance
diff --git a/policyengine_us/variables/household/income/spm_unit/spm_unit_benefits.py b/policyengine_us/variables/household/income/spm_unit/spm_unit_benefits.py
index 4c7705cf267..cb65b512f5d 100644
--- a/policyengine_us/variables/household/income/spm_unit/spm_unit_benefits.py
+++ b/policyengine_us/variables/household/income/spm_unit/spm_unit_benefits.py
@@ -29,6 +29,7 @@ def formula(spm_unit, period, parameters):
             "wa_ssp",  # Washington benefits
             "mi_ssp",  # Michigan benefits
             "me_ssp",  # Maine benefits
+            "mo_ssp",  # Missouri benefits
             # California programs.
             "ca_cvrp",  # California Clean Vehicle Rebate Project.
             # Colorado programs.