openaccountants/openaccountants

Overview

A library of researched, verified tax and accounting rules for over 190 countries and every US state that you can connect to your AI assistant, so questions about compliance or filing requirements get answered against real, checked sources instead of a guess. Accountants and business owners can load it into Claude or ChatGPT directly, or connect through MCP for the accountant-verified version. Useful anywhere a business operates across more than one tax jurisdiction and wants its assistant grounded in accurate rules.

Best for

Best for
Business owners and accountants who need tax guidance checked against real jurisdiction rules

Use cases

• Ask what the filing requirements are for a specific country or US state
• Check a tax rule before advising a client or making a business decision
• Ground an AI assistant's compliance answers in verified sources instead of guesses
• Compare obligations across jurisdictions when expanding into a new market

How to use

Install

pip install openaccountants-mcp

Tested with

Claude Desktop, Cursor, Claude Code, Windsurf, ChatGPT, Claude.ai, Any MCP-aware client

Example client config

{\n  "mcpServers": {\n    "openaccountants": {\n      "command": "openaccountants-mcp"\n    }\n  }\n}

Notes

Openaccountants is an open-source repository of tax and accounting knowledge designed for AI agents. It provides over 1,000 research-verified skills covering 192 jurisdictions, including 130+ countries and every U.S. state. Users can upload these skills to Claude or ChatGPT, or connect via the MCP connector for accountant-verified versions.

155 stars on GitHub. Last updated 2026-06-07. Licensed AGPL-3.0.

Use cases

• Enable AI agents to perform tax calculations across multiple countries and states.
• Provide accurate accounting guidance for international compliance scenarios.
• Integrate verified tax rules into custom AI workflows or chatbot applications.

Pros

• Covers 192 jurisdictions, offering broad global tax and accounting knowledge.
• Open-source and free to use, allowing customization and community contributions.
• Accountant-verified versions available via the MCP connector for higher reliability.

Cons

• Accountant-verified versions require the MCP connector, adding complexity.
• Limited to the tax and accounting domain, not general-purpose AI assistance.
• Integration may require familiarity with MCP protocol and AI agent frameworks.

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.