Connect your assistant to live tax rates
A free Model Context Protocol server your assistant calls directly — source-cited GST/VAT, income, company and capital-gains tax across 50 countries. No login, no API key.
MCP endpoint
https://taxmcp.ai2fin.comPaste into Claude or ChatGPT → Settings → Connectors. Connected in under a minute.
You ask
“What’s the GST on $4,400 in Australia?”
GST is $400 — the price before GST is $4,000, total $4,400.
You ask
“What’s my take-home on $90,000 in Australia?”
About $70,412 — $17,788 income tax plus a $1,800 Medicare levy (2025-26).
You ask
“CGT on a $20,000 crypto gain held over a year, $90k salary?”
About $3,200 — the 50% discount halves the gain to $10,000, taxed at your marginal rate.
You ask
“How much HELP/HECS will I repay on $75,000?”
About $821 for 2026-27 — 15c of each dollar over the $69,528 threshold, straight from ATO rates.
The tools your assistant gets
tax_rate_lookupA country’s GST/VAT, income and company tax rates.
compute_gst_vatAdd or remove a country’s GST/VAT on any amount.
compare_countriesCompare tax across several countries at once.
income_tax_estimateIncome tax and take-home pay for Australia or New Zealand.
company_tax_estimateCorporate tax on a profit — AU, US, UK, Canada and India.
cgt_estimateAustralian capital gains tax, with the 50% discount.
superannuation_estimateAustralian super — guarantee contributions, caps and contributions tax.
student_loan_repaymentAustralian HELP/HECS — the compulsory repayment on your income.
Income-tax, company-tax and CGT estimates cover the source-verified countries (AU/NZ income; AU/US/UK/CA/IN company; AU CGT, super & HELP/HECS). General information, not tax advice.
This page · Public
Tax MCP
Tax rates and calculators for any country — no login, no account data. For everyone.
https://taxmcp.ai2fin.comYour account
2Fin app MCP
Connect an assistant to your own 2Fin data — transactions, categories and live tax position. Asks you to sign in.
https://api.ai2fin.com/mcpWhat the Tax MCP covers
Every figure is cited to its national tax authority with a verified date — so your assistant always knows the source, and says so when data is partial.
Being built next: income brackets for more countries, multi-country capital gains (with holding periods and exemptions), and withholding-tax & tax-treaty lookups. Where coverage is partial, the tool tells you rather than guessing.
Connect in 3 steps
- 1
Copy the endpoint
https://taxmcp.ai2fin.com
- 2
Add it as a connector
In Claude, open Settings → Connectors → Add custom connector and paste the endpoint (works the same in ChatGPT, Cursor or your own agent). No login, no API key.
- 3
Just ask
Ask your assistant “what’s the GST on $4,400 in Australia?” or “compare VAT in Germany, France and the UK” — it calls the tool and answers.
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}}}'
In an editor? One click.
The buttons pre-fill the server config — nothing to type.
Claude Code — one line in your terminal
claude mcp add --transport http taxmcp https://taxmcp.ai2fin.comCommon questions
What is the Tax MCP?
A free Model Context Protocol server. It lets an assistant call tax tools directly — look up GST/VAT, income and company tax rates for 50 countries, add or remove GST/VAT on an amount, compare countries, and estimate income tax, company tax, capital gains, superannuation and HELP/HECS repayments.
How do I connect it to my assistant?
Add the endpoint (https://taxmcp.ai2fin.com) as a custom MCP connector in any MCP-compatible assistant — Claude, ChatGPT, Cursor, or your own agent. There is no login or API key — it is public.
Is my financial data involved?
No. This is the public tax server — Fin computes over published rate data only and stores nothing, with no login. It is completely separate from your 2Fin account. To connect an assistant to your OWN data, use the authenticated app server below.
Tax MCP or the 2Fin app MCP — which do I want?
Use this public Tax MCP (https://taxmcp.ai2fin.com) for rates and calculators — GST/VAT, income, company and capital-gains tax for any country, no sign-in. Use the 2Fin app MCP (https://api.ai2fin.com/mcp) when you want your assistant to work with your own account: your real transactions, categories and live tax position (it asks you to sign in first).
What can I ask it?
Things like “add GST to $200 in New Zealand”, “what’s the VAT rate in Ireland?”, “how much HECS will I repay on $75k?”, or “compare GST and income tax for Singapore, Australia and the UK”.
Is it free?
Yes — completely free, no sign-up. The same rates power the free calculators and comparison tool on this site.
Know someone whose agent should know tax?
Every share helps another assistant answer with sourced figures instead of guesses.
Building with the Tax MCP?
Drop this badge in your README — it shows your numbers come from cited sources.
[]Explore the tax tools
All tools →Compare tax by country
Put countries side by side — rates, local names, structure and filing.
Tax rates by country
Every standard and reduced GST/VAT rate, with income and company tax, in one table.
GST Calculator
Add or remove GST/VAT on any amount, with the formula shown every time.
BAS Calculator (AU)
Your quarterly GST position — 1A, 1B and the net amount payable, worked out for you.
Income Tax & Take-Home
Your income tax, Medicare levy and take-home pay on any salary.
UK Income Tax & Take-Home
Your UK income tax, National Insurance and take-home pay — England, Wales & NI rates.
India Income Tax & Take-Home
Your India income tax on the new regime — the ₹75k standard deduction, the ₹12L rebate and 4% cess, with take-home.
US Income Tax & Take-Home
Your US federal income tax, Social Security and Medicare — single filer, with take-home pay.
Capital Gains Tax (AU)
Sold an asset? Fin works out your CGT — the 50% discount and your losses, at your marginal rate.
Crypto Tax (AU)
Sold or swapped crypto? Fin works out the CGT — same 50% discount, at your marginal rate.
Company Tax Calculator
See the tax on your company’s profit across AU, UK, US, Canada and India — every rate sourced.
Tax facts
The weird, wonderful and true history of GST and VAT — every fact sourced.