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Can Claude calculate loan payments?

Yes, with care. Claude knows the payment formula, but long text math can slip by a few cents or worse. With code execution on (the default on Free, Pro and Max) it can run the numbers in its sandbox. Connect the Amortization server (free token) and Claude stores the loan, returns the exact level payment and effective annual rate, and builds the period by period schedule of interest and principal.

Connect with a free token Amortization MCP server

What Claude does alone, and what needs the server

Claude on its own

  • Explains how an amortizing loan works.
  • Gives a rough payment for a quick check.

With the Amortization server

  • The exact payment, total interest and effective rate.
  • A schedule row for every period, closing at zero.
  • A saved register of your loans.

A real call to the live server

We sent this to the hosted server on 2026-11-05. The answer below is the server's own text, not a mock-up. Live values will differ when you ask.

You ask

Record a 25,000 USD equipment loan at 7.5 percent over 48 months from 1 December 2026.

Tool call

loan_create {"name":"Equipment loan","principal_minor":2500000,"currency":"USD","rate_bps":750,"compounding":"monthly","payment_frequency":"monthly","term_periods":48,"method":"annuity","start_date":"2026-12-01"}

Server answer

{"payment": "USD 604.47", "first_payment_date": "2027-01-01", "final_payment_date": "2030-12-01", "total_payments": "USD 29,014.56", "total_interest": "USD 4,014.56"}

The server answers in JSON. These fields are unchanged.

You ask

Show the first three rows of the schedule.

Tool call

loan_schedule {"loan":"Equipment loan","limit":3}

Server answer

[{"period": 1, "date": "2027-01-01", "opening": "USD 25,000.00", "payment": "USD 604.47", "interest": "USD 156.25", "principal": "USD 448.22", "closing": "USD 24,551.78"}, {"period": 2, "date": "2027-02-01", "opening": "USD 24,551.78", "payment": "USD 604.47", "interest": "USD 153.45", "principal": "USD 451.02", "closing": "USD 24,100.76"}, {"period": 3, "date": "2027-03-01", "opening": "USD 24,100.76", "payment": "USD 604.47", "interest": "USD 150.63", "principal": "USD 453.84", "closing": "USD 23,646.92"}]

The server answers in JSON. These fields are unchanged. The minor-unit copies of each figure are left out.

Connect it in 1 minute

Get a free token first. No account, 30 days, 600 calls an hour. Put it in the URL in place of <token>. In Claude.ai or Claude Desktop open Settings, then Connectors, then Add custom connector, and paste the URL.

1. Free token

curl -s -X POST https://mcp.zovo.one/mcp/token

Connector URL (replace <token>)

https://mcp.zovo.one/mcp/amortization/t/<token>

Claude Code

claude mcp add --transport http amortization https://mcp.zovo.one/mcp/amortization/t/<token>

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "amortization": {
      "url": "https://mcp.zovo.one/mcp/amortization/t/<token>"
    }
  }
}

VS Code (.vscode/mcp.json)

{
  "servers": {
    "amortization": {
      "type": "http",
      "url": "https://mcp.zovo.one/mcp/amortization/t/<token>"
    }
  }
}

All 7 tools, free and Pro limits and more prompts are on the Amortization MCP server page.

Questions

Can Claude calculate loan payments?
Yes, with care. Claude knows the payment formula, but long text math can slip by a few cents or worse. With code execution on (the default on Free, Pro and Max) it can run the numbers in its sandbox. Connect the Amortization server (free token) and Claude stores the loan, returns the exact level payment and effective annual rate, and builds the period by period schedule of interest and principal.
Does it handle leases and balloons?
Yes. loan_create takes a balloon or residual value, fees and straight-principal as well as level payments.
What is free?
Three loans with schedules. Early repayment, journals and the debt report are Pro.
Is the server free?
The hosted Amortization server has a free tier. A free token lasts 30 days and allows 600 calls an hour, with no account. Some features are Pro, and the server page lists what is free and what is not.

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