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ryanduguid/README.md

Ryan Duguid

A trial balance can balance while the creditors reconciliation is still wrong.

Synthetic month-end example: the trial balance and creditors subledger differ by $250. That difference belongs in the review queue, with supporting evidence and a reviewer’s conclusion, before sign-off.

Inspect the worked exception pack.

I’m a Senior Accountant at an advisory firm in Newcastle, NSW. I build open-source tools for Australian tax, payroll and financial reporting.

These are review aids, not professional advice; a human remains responsible for decisions.

Start here

Upstream work

28 merged OpenAccountants PRs, including the Australian BAS guide; a merged Meltano SDK fix retaining refreshed OAuth tokens.

OCA financial-report fix: approved, awaiting merge.

Background

Provisional member of Chartered Accountants ANZ. SAP S/4HANA certified in FI and CO. Xero specialist certification, Level 3.

Written independently, in my own time and on my own equipment.

How I use AI and record development work.

Pinned Loading

  1. accounting-review-pipeline accounting-review-pipeline Public

    For Xero bookkeepers and reviewers: deterministic month-end close controls over trial-balance exports, producing exception packs for human sign-off.

    Python

  2. Ozzit Ozzit Public

    For Excel modellers: 134 native Excel LAMBDA functions for Australian GST arithmetic and financial modelling. No add-ins, no macros. Microsoft 365 or Excel 2024 and later.

    Python

  3. australian-accounting australian-accounting Public

    For Australian accountants and MCP users: local engines for ATO small-business benchmarks, Payday Super 2026 and Division 7A loan review, exposed as the aus-accounting-mcp server. Synthetic fixture…

    Python

  4. australian-accounting-skills australian-accounting-skills Public

    For public-practice teams on Claude Code or Codex: 19 skills from BAS preparation to WIP over/under billing. Review aid, not lodgment.

    Python 1

  5. llm-tax-guardrails llm-tax-guardrails Public

    For firms putting LLMs on tax work: APES 110 and TPB Code guardrails, DrDebits refusal patterns and evaluation fixtures.

    Python 1

  6. au-tax-legislation-corpus au-tax-legislation-corpus Public

    Provenance-rich corpus of in-force Commonwealth tax legislation.

    Python