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AI2Fin (2Fin) Tax MCP

Free public tax MCP: GST/VAT, income, company & capital-gains tax for 50+ countries, source-cited.

Links

Repository

README

From the repo.

Tax MCP

The Model Context Protocol server behind the free tax tools at ai2fin.com/tools/compare — so assistants (Claude, ChatGPT, agents) can call them directly.

Stateless and no-auth. It computes over public rate data only and stores nothing. (This is separate from the authenticated app MCP at app.ai2fin.com/mcp, which works on your real financial data behind OAuth.)

Tools

ToolWhat it does
tax_rate_lookupA country's GST/VAT, income and company tax rates
compute_gst_vatAdd or remove a country's GST/VAT on an amount
compare_countriesCompare tax across countries — ai2fin.com/tools/compare as a callable
income_tax_estimateIncome tax estimate over effective-dated brackets (AU, NZ)
company_tax_estimateCompany tax estimate with small-business thresholds (AU, US, GB, IN, CA)
cgt_estimateCapital-gains tax estimate — losses, discount, marginal stacking (AU resident individuals)

The estimate tools answer only for countries with verified data and degrade to "not available" elsewhere. Every result carries a "general information, not tax advice" note and cites its source authority.

Data = single source

data/rates.json is produced by the website's gen:tax pipeline — the same source behind the calculator and comparison pages — so the MCP, the widgets and the pages never disagree. Don't hand-edit it.

Run / deploy

cd tax-mcp
npm install
npm run dev      # local: POST JSON-RPC to http://localhost:8787
npm run deploy   # to Cloudflare; then map a route e.g. taxmcp.ai2fin.com
npm run bundle   # writes dist/worker.js — a single paste-ready file for the
                 # Cloudflare dashboard editor when the CLI isn't available

Full deploy steps (dashboard copy-paste or CLI): DEPLOY.md.

Abuse protection is via the Cloudflare dashboard (rate limiting + WAF) — not auth.

Connect

Add the deployed URL as a custom MCP connector in Claude (Settings → Connectors) or ChatGPT (developer mode). A GET to the root returns server info; the MCP handshake is POST JSON-RPC (initialize → tools/list → tools/call). It pairs with the live comparison tool at ai2fin.com/tools/compare.

Quick check

curl -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"}}}'

Config for your environment

Use the endpoint URL below in your config. No API key — you connect directly.

Tool

OS

Config file: ~/.cursor/mcp.json

{
  "mcpServers": {
    "mcp-server": {
      "url": "https://taxmcp.ai2fin.com"
    }
  }
}

Paste into mcpServers in the config file. Restart Cursor after saving.

If this MCP is also published on mcpchannel.ai, you can subscribe from Browse and use the gateway config there instead.