Openaccountants MCP Server

OpenAccountants

Open tax skills for AI. Your AI answers tax questions from memory. Add these skills and it answers from the law: every rate, threshold and deadline cited to its official source, for 190+ jurisdictions.

2,132 AI skills across 249 jurisdictions · 33 accountant-reviewed · 39 named accountants · 6,115 questions answered through connected AIs

Live from openaccountants.com — updated 2026-10-30 by the nightly sync.

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Find your country

Browse all countries, by region, with the state of each pack. United States: federal and states.

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Add to your AI

Add this address to Claude, ChatGPT, Cursor, Windsurf or any AI that takes a connector:

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?"

• 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.

Also listed on Smithery and the MCP Registry.

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Contribute

Three ways in, all in CONTRIBUTING.md:

• I can write. Take a country and write its missing skills from the law.
• I am an accountant. Review a skill and put your name on it.
• I found a mistake. Open an issue with the source that shows it.

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How to read a skill

This library holds accountant-reviewed skills and skills no accountant has signed off yet. 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.

Every skill is in exactly one state:

The definitions: docs/QUALITY-TIERS.md. How skills are built, checked and corrected: docs/ACCURACY-METHODOLOGY.md. Which number to quote and where it is measured: docs/COVERAGE.md.

⚠️ 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 Skills may be incomplete, outdated, or wrong for your facts.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.

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Need the work done?

OpenAccountants also does the bookkeeping, VAT, payroll and tax work for businesses, in the countries they work in. Talk to us. The skills and the AI connection stay free.

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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 skill 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 skills 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 skills 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 skill 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

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For developers

API and platform integrations: openaccountants.com/for-developers

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Related open-source projects

Independent, open-source review aids and calculation tools that complement the OpenAccountants skill library:

• payday-super-checker (Apache-2.0): 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 (Apache-2.0): 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 (Apache-2.0): Exports a Xero trial balance to CSV only when month-movement and YTD column pairs both balance exactly.
• ato-benchmark-compare (Apache-2.0): 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.)

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License

• Code (mcp/, scripts/, tools/, calculators/): AGPL-3.0-only
• Skill content: OpenAccountants Guide License, see LICENSING.md; commercial options in COMMERCIAL-LICENSING.md

Contact: info@openaccountants.com · Security policy · Cite this repo