mcp.so submission — calcfi-mcp

Source page: https://mcp.so/my/servers/8b20fd0e-1cfc-4181-9913-594f31313295/edit Last updated: 2026-06-01

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Name

calcfi-mcp

Title

CalcFi MCP

Description

24 free personal-finance + macro tools (mortgage, paycheck, tax, FRED, BLS) for LLM agents. Zero API keys, stdio transport.

Status

created — leave default

Type

server — leave default

Tags

finance,fintech,calculators,mortgage,tax,fred,bls,irs,personal-finance,stdio,claude,cursor

Avatar URL

Primary: https://calcfi.app/icon-512.png Fallback if 404: https://calcfi.app/favicon.ico

Author Name

jeresalmisto

GitHub URL

https://github.com/jeresalmisto/calcfi-mcp

Server Config

{
  "mcpServers": {
    "calcfi": {
      "command": "npx",
      "args": ["-y", "calcfi-mcp-server"]
    }
  }
}

Content

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What it does

CalcFi MCP exposes 24 tools to LLM agents covering personal finance and live US macroeconomic data. All calculations are deterministic and source-cited from IRS, Federal Reserve, BLS, Treasury, Census, HUD, and Freddie Mac.

Personal-finance tools

• Mortgage payment + amortization — Freddie Mac PMMS + HUD FMR + Census ACS
• Take-home pay calculator — federal + state withholding (IRS Pub 15-T + state DOR tables)
• Federal + state tax brackets
• Retirement savings projection with Monte Carlo confidence bands
• Debt payoff comparison — snowball + avalanche
• Compound interest visualizer
• 401(k) contribution optimizer — current-year IRS limits
• Self-employed tax estimator — 15.3% SE rate + quarterly estimates

Live macro data tools

• FRED series lookup — Federal Reserve Economic Data
• BLS labor data — unemployment, wages, CPI
• Freddie Mac PMMS weekly mortgage rates
• IRS Rev. Proc. table queries
• Treasury yield curve
• Census ACS demographics + income
• HUD FMR rent + Zillow ZHVI home values by state

Install

Claude Desktop / Cursor / Cline / any MCP client:

{
  "mcpServers": {
    "calcfi": {
      "command": "npx",
      "args": ["-y", "calcfi-mcp-server"]
    }
  }
}

Python: pip install calcfi-mcp

{
  "mcpServers": {
    "calcfi": {
      "command": "python",
      "args": ["-m", "calcfi_mcp"]
    }
  }
}

Full developer docs + API reference →

Why use it

• Deterministic. Math runs in code, not predicted by the LLM. No hallucinated tax brackets, no drifted mortgage rates.
• Source-cited. Every tool output includes the IRS publication, Fed series ID, BLS table number, or other primary-source reference. See the methodology page.
• Free + open. No API key, no signup, MIT license. Backed by free public financial data updated daily.
• Already on the official Model Context Protocol Registry as io.github.jeresalmisto/calcfi-mcp v0.1.6.

Built by

Jere Salmisto, solo founder in Helsinki — building free personal-finance tools for LLM agents and consumers.

Links

• calcfi.app — Free financial calculators
• GitHub source
• npm calcfi-mcp-server
• PyPI calcfi-mcp
• MCP Registry entry