OpenAccountants

Open-source Tax Guides your AI can cite — reviewed by named, licensed accountants.

Every AI can do tax math. None of them can stand behind an answer. Here, real accountants put their name, credential and review date on the Guides your AI reads — publicly, on the record, in this repo.

https://www.openaccountants.com/api/mcp

Guided setup: openaccountants.com/connect

Then ask a question your AI would otherwise guess at:

"What's the combined sales tax rate in Manatee County, Florida for 2026?"

Without OpenAccountants, models answer from training data. With it, the answer cites the current Guide — and names the accountant who reviewed it.

You:    "I'm a freelancer in South Africa. What do I owe?"
          ↓  loads za-income-tax, za-provisional-tax
AI:     ITR12 working paper · IRP6 provisional schedule
        Medical credits · Retirement annuity deduction
        ─────────────────────────────────────────
        Reviewed by Werner Britz CA(SA)

Two states, greppable honesty

Every Guide is in exactly one state — and the repo greps honestly:

| State | Meaning | |---|---| | Accountant-reviewed | A named, licensed accountant reviewed the complete Guide. Their name is in the frontmatter (reviewed_by:) and on the public roster | | Source-cited draft | Written from primary legislation, every figure cited to its source — not yet professionally reviewed |

⚠️ General reference, not advice. Guides may be incomplete, outdated, or wrong for your facts. Have a qualified professional review outputs before filing, payment, or action.

Are you an accountant?

Your name on the tax knowledge AI actually uses — with attribution built in:

1. Build a Guide for the work you know cold: openaccountants.com/skills/new. It publishes credited to you, and lands in this repo under your name.
2. Review a Guide in your jurisdiction — your name, credential and review date go on it, here and on every AI answer that cites it.
3. Set your GitHub username in your profile and your platform edits are committed to this repo as you — your contribution graph reflects your work.

How it stays accurate

A tax library is only as good as its worst stale number, so machines re-check this one every night:

• The maths check re-reads every guide and flags sums that do not add up, tax bands

• The source watch visits the official pages the figures came from and raises a hand

• The refresh engine re-derives the stalest guides from official sources on a fixed

• The nightly exam tests whether AIs actually said what the guides say that day, or

The sync runs both ways: platform edits land here as commits under the author's own name, and merged PRs here flow back into what every AI serves, credited to you. A guide with an accountant's byline never changes without that accountant's one-click approval.

The whole story, in plain words: openaccountants.com/how-it-works

Contributing

Edit skills/ only** — everything else regenerates automatically:

• packages/, index.json, llms-full.txt — generated nightly; never edit in a PR
• Merged source PRs are credited to you and must be confirmed as ingested before the next platform export
• Full guide: CONTRIBUTING.md · Layout: docs/REPO-LAYOUT.md

For developers

| What | Where | |---|---| | Guide source (per jurisdiction) | skills/ | | Per-country bundles (generated) | packages/ | | Machine-readable inventory | index.json | | LLM entry point | llms.txt | | Python MCP server | mcp/ · PyPI | | Repo architecture + sync | docs/REPO-LAYOUT.md · docs/WEBSITE-SYNC.md |

API and platform integrations: openaccountants.com/for-developers

Related open-source projects

Independent, open-source review aids and calculation tools that complement the OpenAccountants guide library:

• payday-super-checker (MIT) — Verifies superannuation contributions against Australian Payday Super deadlines (in force since 1 July 2026) and estimates SG charge exposure on late payments, with all workings and statutory assumptions disclosed.
• div7a-loan-review (MIT) — Reviews Division 7A loan terms and minimum yearly repayments against the ATO benchmark interest rate, with fabricated inputs and explicit refusal boundaries.
• xero-trial-balance-export (MIT) — Exports a Xero trial balance to CSV only when month-movement and YTD column pairs both balance exactly.
• ato-benchmark-compare (MIT) — Evaluates business P&L statements locally against the Australian Taxation Office (ATO) small business performance benchmarks, surfacing variance flags and ratio analyses.

License

• Code (mcp/, scripts/, tools/): AGPL-3.0
• Guide content: OpenAccountants Guide License v1.0 — see LICENSING.md; commercial options in COMMERCIAL-LICENSING.md