OpenAccountants
Open-source accounting skills for AI. 890+ skills across 134 countries + 51 US state packages + 13 Canadian province/territory packages.
11 accounting domains: tax, bookkeeping, e-invoicing, payroll, company formation, financial statements, transfer pricing, tax optimization, crypto tax, cross-border, plus industry verticals and platform integrations.
⚠️ Important — what's in this repo and what isn't
OpenAccountants runs on a two-layer model:
| Layer | Where it lives | Quality tier | How to get it |
|---|
| Research drafts (rules, rates, thresholds, workflow bases) | This GitHub repo | Tier 2 — research-verified, AI-drafted, not signed by a credentialed accountant | Clone, fork, audit, contribute. Use freely under the AGPL-3.0 / commercial dual license. |
| Accountant-verified skills (signed off by a named licensed CPA / CA / EA / Steuerberater / equivalent) | The website + MCP server at openaccountants.com | Tier 1 — corrections applied, audit flash points reviewed, verifier name on every output | Install the MCP connector at openaccountants.com/connect. Your AI loads them automatically with the verifier's name on every answer. |
Why split? The skill rules (rates, thresholds, statutes) are public domain restructured — those live here, open. The verified version of record — corrected by a named accountant, with their reputation on it — is served via the MCP so the AI-to-human handoff (request_accountant_review) can route users to a real CPA. That handoff is the product. The repo is the research base.
To USE OpenAccountants: install the MCP connector at openaccountants.com/connect — works with Claude.ai, ChatGPT, Cursor, Windsurf, and any other MCP-aware AI client.
To CONTRIBUTE or AUDIT: you're in the right place. Open issues, submit PRs, verify your jurisdiction.
Website: openaccountants.com · Install: openaccountants.com/connect · Verifiers: openaccountants.com/network
👉 Start here
New to this repo? Read START-HERE.md — it has a table of scenarios ("I'm a freelance developer in California", "I sell on Etsy", "I'm worried about Pillar Two", etc.) and tells you exactly which files to upload and what to say to the AI.
If you just want to dive in, pick your jurisdiction:
| You are… | Go to |
|---|
| Freelancer / sole prop in a country | packages/<country>/ (e.g. malta, germany, uk) |
| US-based — freelancer or single-member LLC | packages/us-<state>/ (e.g. us-ca, us-ny, us-tx) |
| Canada-based — sole prop | packages/ca-<province>/ (e.g. ca-on, ca-qc, ca-bc) — federal + provincial bundled. If absent, run python3 scripts/build-packages.py to (re)generate them. |
| Cross-border or sector-specific (SaaS, banking, REIT, etc.) | skills/cross-border/ and skills/verticals/ |
Two ways to use OpenAccountants
| Method | What you get | Best for |
|---|
| MCP connector (recommended) | All accountant-verified skills, with named-verifier attribution and the AI-to-human handoff (request_accountant_review routes to a real CPA with your worksheet attached). Install at openaccountants.com/connect. | Anyone who actually wants to use OpenAccountants. Claude.ai, ChatGPT (paid Business+), Cursor, Windsurf, Claude Desktop, Claude Code, or any MCP-aware client. |
| Manual upload from this repo | Only the research-verified drafts in this repo (no verifier name, no handoff). Download a folder, drag .md files into your LLM. | Developers / accountants who want to audit, fork, or contribute to the open library before installing. |
The MCP path is the canonical product. This repo is the open research base that backs it.
Known limitations
Read this before you trust any output.
