This MCP server provides open-source tax skills for AI, positioned as “OpenAccountants.” The server description states it supports tax guidance across 134 countries. Its published guides are described as reviewed by named, licensed accountants, with each guide including a name, credential, and review date.
🛠️ Key Features
Open-source tax skills for AI
Tax guidance across 134 countries
Guides reviewed by named, licensed accountants
Guides include accountant name, credential, and review date
Uses topics including tax, accounting, vat, gst, compliance, and verified tax
🚀 Use Cases
Citing tax guides in AI-assisted workflows
Supporting AI tax question answering with referenced, reviewed content across countries
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.
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.
code
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)
Prefer self-hosting or manual files?
pip MCP server:pip install openaccountants-mcp (mirrors this repo's packages/)
Manual: download your jurisdiction's folder from packages/ and upload the files to your AI. Start with your country's main package; index.json is the machine-readable inventory.
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 Guides may be incomplete, outdated, or wrong for your facts.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:
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.
Review a Guide in your jurisdiction — your name, credential and review date go on it, here and on every AI answer that cites it.
Set your GitHub username in your profile and your platform edits are committed to this repo as you — your contribution graph reflects your work.
The current roster: VERIFIERS.md (generated nightly from the platform).
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
with gaps, totals that do not total, and years that disagree.
The source watch visits the official pages the figures came from and raises a hand
when a page changes.
The refresh engine re-derives the stalest guides from official sources on a fixed
monthly budget, refusing to publish any figure without a link.
The nightly exam tests whether AIs actually said what the guides say that day, or
improvised. Improvisation gets caught, counted and fixed at the source.
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.
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.
(External tools provide computational review assistance and do not constitute tax or legal advice.)
