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UK income tax and salary MCP server

UK take-home pay for 2025/26 and 2026/27, Scottish bands and student loans included.

Connect free Source on GitHub

Free. No key, no sign-in, no paid tier. 4 tools.

Connector URL

https://uk-income-tax-salary-mcp.lipmichal.workers.dev/mcp

Paste it as a custom connector in Claude, or add it to Claude Code, Cursor or VS Code. Setup for each is below.

What it knows that a model does not

A model answers from training data. This server reads the source when you ask.

  • HMRC's 2026/27 rates, including the new Scottish bands. Many models stop at an older tax year.
  • National Insurance, all student loan plans and pension relief, in one calculation.
  • The real marginal rate, including the 60% trap between 100,000 and 125,140 GBP.

Sources HMRC rates and thresholds for employers 2025/26 and 2026/27, and gov.uk tax pages.

Tools (4)

Read from the live server with tools/list on 2026-11-02.

ToolWhat it does
calculate_uk_take_home UK take-home pay. Calculates UK take-home pay for an employee in tax year 2025/26 or 2026/27 from HMRC's published rates: income tax by band (England, Wales and NI, or the six Scottish bands incl. the 2026/27 Scottish starter and basic bands), employee...
get_uk_tax_bands UK income tax bands and thresholds. Returns the official UK income tax bands for 2025/26 or 2026/27, for England, Wales and Northern Ireland or for Scotland (starter 19%, basic 20%, intermediate 21%, higher 42%, advanced 45%, top 48%), both as taxable-income bands from...
compare_salaries Compare UK salaries after tax. Compares 1 to 5 UK gross salaries after income tax, National Insurance, student loan and pension for 2025/26 or 2026/27, with the same region, tax code and options for each.
marginal_rate_at_income UK marginal tax rate at a salary. Returns the true UK marginal rate on the next pounds of salary in 2025/26 or 2026/27: income tax band rate, employee NI and student loan together, plus the Personal Allowance taper between £100,000 and £125,140 that makes it 60% plus NI in...

Connect it

One URL, no token. Pick your app.

Claude.ai and Claude Desktop

Open Settings, then Connectors, then Add custom connector. Paste the URL. Leave the OAuth fields empty. Save.

https://uk-income-tax-salary-mcp.lipmichal.workers.dev/mcp

Claude Code

Run this in your terminal. Then run claude mcp list to check it.

claude mcp add --transport http uk-income-tax-salary https://uk-income-tax-salary-mcp.lipmichal.workers.dev/mcp

Cursor

Merge this into ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (one project).

{
  "mcpServers": {
    "uk-income-tax-salary": {
      "url": "https://uk-income-tax-salary-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

VS Code

Put this in .vscode/mcp.json. The top key is servers, not mcpServers.

{
  "servers": {
    "uk-income-tax-salary": {
      "type": "http",
      "url": "https://uk-income-tax-salary-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Prefer to run it on your machine? It is on npm: npx -y uk-income-tax-salary-mcp (needs Node.js).

Things to ask

Paste one into a new chat after you connect.

Sourcegithub.com/theluckystrike/uk-income-tax-salary-mcp Web calculatorUK Money Calc npmuk-income-tax-salary-mcp

Questions

Is the UK income tax and salary MCP server free?
Yes. The hosted URL is free and needs no token, key or account. The source is open on GitHub.
Why not just ask the model?
A model answers from its training data. That data stops at a cutoff date, and long sums can drift. This server reads its data or rules each time you ask, so the answer is current and exact.
Where does the data come from?
HMRC rates and thresholds for employers 2025/26 and 2026/27, and gov.uk tax pages.
Which apps can use it?
Any MCP client that accepts a remote server URL: Claude.ai and Claude Desktop custom connectors, Claude Code, Cursor, VS Code and others. You can also run it locally with npx.

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