OpenAccountants

Open-source tax computation skills for AI. 371 skills across 134 countries.

Upload to Claude, ChatGPT, or any LLM with your bank statement — or connect via MCP so your AI loads the right country's tax skills automatically. Get a working paper ready for your accountant and cut your accounting bill by 80%.

Your accountant charges by the hour. Most of that time is classifying transactions and filling forms. These skills do that work before the meeting. Your accountant reviews and signs off in 20 minutes instead of 3 hours.

Website: openaccountants.com

Two ways to use OpenAccountants

Both methods use the same skill files. MCP just removes the manual step. See Quick start for uploads or MCP server for the automated path.

Known limitations

Read this before you trust any output.

• LLMs hallucinate and misread. These files steer the model; they do not guarantee correct numbers, classifications, or filings. Always have a qualified professional review before you act.
• Tax law changes. Rates, thresholds, and forms go out of date. The repo is a snapshot; openaccountants.com may be ahead of what you cloned.
• Verification is tiered, not binary. Most skills are not “battle-tested by a practitioner on real client data.” We publish Q1–Q5 tiers: Q1 is the bar for that; Q2 is research-verified to authority sites but not yet proven on real statements; Q3 is AI-drafted with citations but not independently verified. Many skills are Q3 or below — check the tier for the file you use.
• Coverage is uneven. Only eight countries ship the full guided stack (VAT + income tax + SSC + walkthrough) in this repo; dozens more have multiple skills without that guided path; many jurisdictions are VAT/GST-only or partial. See Coverage below and each country folder’s README.

Honesty is the point: if you know where the gaps are, you can use the project safely. Skeptics welcome.

Quick start (60 seconds)

1. Find your country

Most countries (130+): everything you need is in one place under packages/. Upload every file in that folder.

packages/
├── malta/           ← 9 files (VAT + income tax + SSC + guided intake)
├── uk/              ← 8 files
├── germany/         ← 7 files
├── australia/       ← 9 files
├── canada/          ← 12 files
├── india/           ← 7 files
├── spain/           ← 7 files
├── ... 126 more countries

United States: there is no packages/us/ folder. US tax work is split across modular skills under skills/ (federal forms, orchestrators that sequence them, and per-state sales tax). That matches how US compliance layers (federal vs 50 states) rather than a single “country bundle” like Malta.

... View full README on GitHub