by openaccountants
Provides open‑source, accountant‑reviewed tax guides that AI models can cite when answering tax‑related queries, ensuring answers are backed by current jurisdictional rules and credited experts.
OpenAccountants delivers a curated library of more than 1,800 tax guides covering 231 jurisdictions. Each guide is written from primary legislation and, when marked Accountant‑reviewed, carries the name, credential, and review date of a licensed CPA/CA/EA, allowing AI systems to cite a verifiable source.
https://www.openaccountants.com/api/mcp to Claude, ChatGPT, Cursor, Windsurf, or any MCP‑compatible client.https://www.openaccountants.com/connect to register the endpoint.pip install openaccountants-mcp, which mirrors the packages/ directory in the repo. Alternatively, download a jurisdiction’s folder from packages/ and upload the JSON files directly to your AI’s knowledge base.reviewed_by: front‑matter linking to a public roster.index.json lists all packages, enabling fast lookup by LLMs.openaccountants-mcp) mirrors the official package set.Q: Do I need a paid subscription to use the connector? A: No. The hosted MCP endpoint is free; commercial licensing applies only to proprietary integration or redistribution of the guide content.
Q: How often are the guides updated? A: Nightly sync checks source pages, runs maths validation, and regenerates affected packages. Critical changes are pushed automatically.
Q: Can I contribute a new jurisdiction or update an existing guide?
A: Yes. Contributors edit files under skills/ on the platform, then submit a PR. If you are a licensed accountant, you can mark the guide as Accountant‑reviewed.
Q: What if the AI hallucinates a figure not present in the guide? A: The system flags mismatches during the nightly exam; such hallucinations are logged and the guide is updated or the model prompt is adjusted.
Q: Is there an on‑premise alternative to the hosted API?
A: Install the Python MCP server (pip install openaccountants-mcp) and serve the packages/ directory from your own infrastructure.
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.
1,870 Guides across 231 jurisdictions · 53 accountant-reviewed · 45 named accountants · 14,580 questions answered through connected AIs
Live from openaccountants.com — updated 2026-09-28 by the nightly sync.
Add the hosted connector to Claude, ChatGPT, Cursor, Windsurf or any MCP client:
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)
pip install openaccountants-mcp (mirrors this repo's packages/)packages/ and upload the files to your AI. Start with your country's main package; index.json is the machine-readable inventory.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.
Your name on the tax knowledge AI actually uses — with attribution built in:
The current roster: 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 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
Edit skills/** only — everything else regenerates automatically:
packages/, index.json, llms-full.txt — generated nightly; never edit in a PR| 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
Independent, open-source review aids and calculation tools that complement the OpenAccountants guide library:
(External tools provide computational review assistance and do not constitute tax or legal advice.)
Contact: info@openaccountants.com · Security policy · Cite this repo
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