Free, no-auth tax tools for AI assistants: GST/VAT, income, company and capital-gains tax, in every country we have verified data for, each answer cited to the national tax authority.
Endpoint: https://taxmcp.ai2fin.com (streamable HTTP, JSON-RPC, no API key, stateless)
Clients: Claude, ChatGPT (developer mode), Cursor, VS Code, or any MCP client
Source of truth: the same tax engine behind the calculators at ai2fin.com/tools
Every result carries its source authority and a "general information, not tax advice" note. Where data isn't verified for a country, the tool says so instead of guessing.
Tool | Title | What it does |
| Historical tax rate lookup | The GST/VAT standard rate that applied in a country on a given date. |
| Country tax rate lookup | Headline GST/VAT, top income tax and company tax rates for 193 countries, plus CA and US state/provincial sales tax. |
| GST/VAT add or remove calculator | Add or remove a country's GST/VAT (or other national consumption tax) on an amount: net, tax and gross. |
| Multi-country tax comparison | GST/VAT, top income tax and company tax side by side across several countries. |
| Income tax & take-home estimate | Income tax and take-home pay for 57 countries over effective-dated brackets, with each country's levies and offsets. |
| Company tax estimate | Company tax on an annual profit for 139 countries, marking which are verified against the national authority. |
| Capital gains tax estimate | Capital gains tax on one sale of shares or property by a resident individual, for 71 countries. |
| Australian HELP/HECS repayment | The compulsory annual study-loan repayment from repayment income, effective-dated by financial year. |
| Australian superannuation estimate | Superannuation Guarantee, concessional cap usage, contributions tax and Division 293. |
| Sourced tax facts | When and why a country's GST/VAT began and other true, sourced stories about its tax system. |
All tools are read-only and idempotent, and each declares an output schema.
Related MCP server: goodvat
Remote (recommended). Add https://taxmcp.ai2fin.com as a custom connector:
Claude: Settings → Connectors → Add custom connector
ChatGPT: Settings → Apps & Connectors → developer mode → Create
Cursor / VS Code / others:
{
"mcpServers": {
"2fin-tax": { "url": "https://taxmcp.ai2fin.com" }
}
}stdio. For clients that only run local servers, this repo's connector relays stdio to the hosted endpoint (Node 18+, no dependencies):
{
"mcpServers": {
"2fin-tax": { "command": "npx", "args": ["-y", "github:ai2finlive/ai2fin-tax-mcp"] }
}
}or with Docker:
docker build -t 2fin-tax-mcp . && docker run -i --rm 2fin-tax-mcpcurl -s https://taxmcp.ai2fin.com -X POST -H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"compute_gst_vat","arguments":{"country":"AU","amount":100,"mode":"add"}}}'The hosted server does the computing. This repo is the public home of the listing and a small stdio connector (bin/stdio-proxy.mjs) that forwards JSON-RPC to the endpoint. It contains no tax logic or data. Set TAX_MCP_URL to point it at another deployment.
npm test # connector tests (local stand-in endpoint, no network)The endpoint is stateless: it computes over public rate data and stores nothing you send. It is separate from the authenticated 2Fin app MCP at app.ai2fin.com/mcp, which works on your own financial data behind OAuth.
MIT for the code in this repo. See LICENSE.
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