Open-source tax rules for 100 countries that your LLM can use

OpenAccountants has published an open-source library of 1,903 AI tax skills covering 229 jurisdictions, of which 33 are accountant-reviewed and 38 named accountants are credited, with 20,132 questions answered through connected AIs as of a 2026-10-18 nightly sync. The skills are served to Claude, ChatGPT, Cursor, Windsurf and other MCP clients through a hosted connector at openaccountants.com/api/mcp, or self-hosted via the pip package openaccountants-mcp, so models can cite a fetched skill and its published review status instead of answering from training data. Each skill is labeled either accountant-reviewed, with the reviewer named in frontmatter and on the public VERIFIERS.md roster, or source-cited draft, and the project runs nightly maths checks, source-watch monitoring and a monthly refresh budget that refuses to publish any figure without a link.

Free AI skills tax rules your AI follows your AI can cite, with sources and published review status. This library includes accountant-reviewed skills and source-cited drafts. Check each skill version's review record before relying on it; a named author is distinct from a professional reviewer. Skill content is source-available under the terms in LICENSING.md https://github.com/openaccountants/openaccountants/blob/main/LICENSING.md . 1,903 AI skills across 229 jurisdictions · 33 accountant-reviewed · 38 named accountants · 20,132 questions answered through connected AIs <sub Live from openaccountants.com — updated 2026-10-18 by the nightly sync.</sub Add the hosted connector to Claude, ChatGPT, Cursor, Windsurf or any MCP client: https://www.openaccountants.com/api/mcp Guided setup: openaccountants.com/connect https://www.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 can cite the fetched skill and its review status. Name a professional reviewer only when that skill version has a published review record. You: "I'm moving to Malta and selling my company next year. What tax do I face?" ↓ loads moving-to-malta-tax-residence, selling-a-company-in-malta AI: Residence and domicile · Remittance basis on foreign income Gain on the share sale · Participation exemption check ───────────────────────────────────────── Authored by Michael Cutajar CPA, ACCA Malta 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/ https://github.com/openaccountants/openaccountants/blob/main/packages and upload the files to your AI. Start with your country's main package; index.json is the machine-readable inventory. Every skill is in exactly one state — and the repo greps honestly: | State | Meaning | |---|---| | Accountant-reviewed | A named, licensed accountant reviewed the complete skill. Their name is in the frontmatter reviewed by: and on the public roster https://github.com/openaccountants/openaccountants/blob/main/VERIFIERS.md | | Source-cited draft | Written from primary legislation, every figure cited to its source — not yet professionally reviewed | General reference, not advice. skills may be incomplete, outdated, or wrong for your facts. Have a qualified professional review outputs before filing, payment, or action. Your name on the tax knowledge AI actually uses — with attribution built in: 1. Build a skill for the work you know cold: openaccountants.com/skills/new https://www.openaccountants.com/skills/new . It publishes credited to you, and lands in this repo under your name. 2. Review a skill 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 https://www.openaccountants.com/profile and your platform edits are committed to this repo as you — your contribution graph reflects your work. The current roster: VERIFIERS.md https://github.com/openaccountants/openaccountants/blob/main/VERIFIERS.md generated nightly from the platform . 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. The whole story, in plain words: openaccountants.com/how-it-works https://www.openaccountants.com/how-it-works 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 https://github.com/openaccountants/openaccountants/blob/main/CONTRIBUTING.md · Layout: docs/REPO-LAYOUT.md https://github.com/openaccountants/openaccountants/blob/main/docs/REPO-LAYOUT.md | What | Where | |---|---| | Skill source per jurisdiction | skills/ https://github.com/openaccountants/openaccountants/blob/main/skills | | Per-country bundles generated | packages/ https://github.com/openaccountants/openaccountants/blob/main/packages | | Machine-readable inventory | index.json https://github.com/openaccountants/openaccountants/blob/main/index.json | | LLM entry point | llms.txt https://github.com/openaccountants/openaccountants/blob/main/llms.txt | | Python MCP server | mcp/ https://github.com/openaccountants/openaccountants/blob/main/mcp · PyPI https://pypi.org/project/openaccountants-mcp/ | | Repo architecture + sync | docs/REPO-LAYOUT.md https://github.com/openaccountants/openaccountants/blob/main/docs/REPO-LAYOUT.md · docs/WEBSITE-SYNC.md https://github.com/openaccountants/openaccountants/blob/main/docs/WEBSITE-SYNC.md | API and platform integrations: openaccountants.com/for-developers https://www.openaccountants.com/for-developers Independent, open-source review aids and calculation tools that complement the OpenAccountants guide library: - payday-super-checker https://github.com/ryanduguid/australian-accounting/tree/main/packages/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 https://github.com/ryanduguid/australian-accounting/tree/main/packages/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 https://github.com/ryanduguid/accounting-review-pipeline/tree/main/packages/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 https://github.com/ryanduguid/australian-accounting/tree/main/packages/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. - Code mcp/, scripts/, tools/ : AGPL-3.0 https://github.com/openaccountants/openaccountants/blob/main/LICENSE - skill content : OpenAccountants Guide License v1.0 — see LICENSING.md https://github.com/openaccountants/openaccountants/blob/main/LICENSING.md ; commercial options in COMMERCIAL-LICENSING.md https://github.com/openaccountants/openaccountants/blob/main/COMMERCIAL-LICENSING.md Contact: info@openaccountants.com mailto:info@openaccountants.com · Security policy https://github.com/openaccountants/openaccountants/blob/main/SECURITY.md · Cite this repo https://github.com/openaccountants/openaccountants/blob/main/CITATION.cff