Tax Calc MCP server: install, tools and pricing

Give Claude (or any MCP client) a tax estimator: us_federal_tax applies the 2026 US federal brackets for a single filer — including the $15,750 standard deduction — and returns total tax, effective rate, and marginal bracket. Planning numbers, computed on your machine, in one sentence.

Category: Money and accounting · Tools: 0 · Version: 0.22.6 · Licence: MIT

Install it

  • Hosted endpoint: not open for this server yet - use the .mcpb bundle or build from source below. The other 46 servers in the suite are already hosted.
  • Claude Desktop, one click: download the .mcpb bundle
  • From source: git clone https://github.com/theluckystrike/mcp-servers then build servers/tax-calc.
  • npm: the package mcp-tax-calc is staged and publishes shortly; the .mcpb bundle is the supported install until then.

Tools it exposes

The tool list is published in the server manifest (server.json) and the repository README.

Pricing

Free to run locally, forever. The Pro licence is $19, one time, lifetime — it changes only the hosted endpoint’s saved-report cap, never the tools. All 58 servers together are $39 as a bundle instead of $1102 bought one at a time.

Buy the Tax Calc Pro licence — $19

Questions people actually ask

Is the Tax Calc MCP server free?

Yes. Running Tax Calc locally is free and unlimited, and the code is MIT licensed. This server is local-only today, so there is nothing to pay for. No subscription and no account are required.

Does Tax Calc need an API key?

No. The server works offline against local files.

Where does the data go?

Local installs keep everything on your machine. The hosted endpoint stores records in an isolated per-tenant namespace, and only for servers you actually call.

Which clients can use it?

Any MCP client: Claude Desktop (via the .mcpb bundle), Claude Code, Cursor, Windsurf, VS Code with an MCP extension, or your own agent over the Streamable HTTP transport.

  • Invoice MCP server — Make real, sendable PDF invoices from a sentence. Clients, numbering that never repeats, VAT lines, discounts
  • Quotes MCP server — Send a client a real quote in seconds: line items with VAT, a validity date, a plain-text version to paste int
  • Recurring MCP server — Bill the same clients every month without remembering to. Define a recurring invoice once, then generate the r
  • Credit Note MCP server — Credit notes against an invoice or standalone: drafts, finalization, rendering, totals.

All 58 back-office MCP servers · how the collection is organised