openaccountants/openaccountants

**Tax Guides your AI can cite, with sources and published review status.**
This library includes accountant-reviewed Guides and source-cited drafts. Check each Guide version's review record before relying on it; a named author is distinct from a professional reviewer. Guide content is source-available under the terms in LICENSING.md.
**1,902 Guides** across **230 jurisdictions** · **53 accountant-reviewed** · **44 named accountants** · **19,443 questions answered** through connected AIs
Live from openaccountants.com — updated 2026-10-15 by the nightly sync.
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Try it in 60 seconds
Add the hosted connector to Claude, ChatGPT, Cursor, Windsurf or any MCP client:
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 can cite the fetched Guide and its review status. Name a professional reviewer only when that Guide version has a published review record.
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.
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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⚠️ **General reference, not advice.** Guides may be incomplete, outdated, or wrong for your facts.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.
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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.
The current roster: **VERIFIERS.md** (generated nightly from the platform).
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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.