IRS mileage rate and per diem MCP server (free, no API key)

Looking for an MCP server for the 2026 IRS mileage rate and current per diem rates? irs-mileage-rate-per-diem-mcp is free, MIT licensed and needs no API key and no account. Paste https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp into any MCP client that takes a remote server URL. IRS mileage rates 2011-2026 (76 cents from July 2026), GSA per diem by ZIP FY2026-27, high-low.

Tools 5, version 1.0.0, licence MIT. Part of the free live-data MCP servers on this hub.

What it answers that a model cannot answer alone

A language model answers from training data that is months old and does arithmetic from memory. This server returns the current figure with its source. In the words of its README, it knows these things that your model does not.

  1. The IRS raised the 2026 business mileage rate mid-year: 72.5 cents a mile from Jan. 1 to June 30, 2026 and 76 cents from July 1, 2026 (Announcement 2026-11). Medical and military moving went from 20.5 to 23.5 cents. Charity stays at 14 cents.
  2. The depreciation part of the 2026 business rate is 35 cents a mile. The FAVR and employer-vehicle maximum value for 2026 is $61,700 (Notice 2026-10).
  3. FY2027 GSA per diem (from Oct. 1, 2026): standard CONUS rate $113 lodging and $68 M&IE, and the rates for 295 named destinations by month.
  4. IRS high-low method from Oct. 1, 2026: $329 high and $230 low, with $86 and $74 treated as meals (Notice 2026-60). Tucson, San Mateo, Albuquerque and Cody were added; Panama City was removed.
  5. The IRS had not announced the 2027 mileage rates on 2026-11-03. The tools say so.

Connect it with no key

Hosted URL for Claude.ai custom connectors, ChatGPT developer mode and any client that takes a remote MCP server. Paste it as is. No token, no sign-up.

https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp

Claude Code, hosted or local:

claude mcp add --transport http irs-mileage-rate-per-diem https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp
claude mcp add irs-mileage-rate-per-diem -- npx -y github:theluckystrike/irs-mileage-rate-per-diem-mcp

Claude Desktop (claude_desktop_config.json), runs locally with Node 20 or newer:

{
  "mcpServers": {
    "irs-mileage-rate-per-diem": { "command": "npx", "args": ["-y", "github:theluckystrike/irs-mileage-rate-per-diem-mcp"] }
  }
}

Cursor (~/.cursor/mcp.json):

{
  "mcpServers": {
    "irs-mileage-rate-per-diem": { "url": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp" }
  }
}

Tools it exposes

Tool What it does
get_mileage_rate Returns the official IRS standard mileage rates in cents per mile for business, medical, charity and military moving use, for a year or a specific date.
calculate_mileage_deduction Calculates the deduction or tax-free reimbursement for driven miles at the IRS standard mileage rates, splitting by the date each trip was driven.
get_per_diem_rates Returns the official GSA federal per diem rates for a U.S. (CONUS) destination by ZIP code or city/state: maximum lodging per night by month and the meals and…
calculate_trip_per_diem Calculates the maximum federal per diem for a business trip: lodging for each night at that month’s GSA rate (crossing seasons and the Oct. 1 fiscal year change), M&IE…
get_high_low_per_diem Returns the IRS high-low substantiation method rates for a date and whether a city is a high-cost locality then: from Oct. 1, 2026 $329 high / $230 low with $86 / $74…

Example output from a live call

Called on 2026-11-03 against the hosted URL above, with no token. The prompt was “What is the IRS standard mileage rate for 2026?” and the client sent this call.

{"name": "get_mileage_rate", "arguments": {"year": 2026}}

The server answered with this plain-English summary (the structured JSON that follows it in the result is left out here).

IRS standard mileage rates for 2026: Jan. 1 - June 30, 2026: business 72.5 cents, medical/moving 20.5 cents, charity 14 cents (Notice 2026-10, IR-2025-128); July 1 - Dec. 31, 2026: business 76 cents, medical/moving 23.5 cents, charity 14 cents (Announcement 2026-11 (IRB 2026-29)). The rate changed mid-year, so split miles by date. Depreciation part of the business rate: 35 cents a mile.
Rates from IRS and GSA publications. General information, not tax advice.

Data as of 2026-11-03. The result also returns the source URL and a link for more detail.

Questions people actually ask

Is there an MCP server for the 2026 IRS mileage rate and current per diem rates?

Yes. IRS mileage rate and per diem (irs-mileage-rate-per-diem-mcp) is a free MCP server. IRS mileage rates 2011-2026 (76 cents from July 2026), GSA per diem by ZIP FY2026-27, high-low. It is hosted at https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp with no token, and it also runs locally with npx -y github:theluckystrike/irs-mileage-rate-per-diem-mcp.

Does the IRS mileage rate and per diem MCP server need an API key?

No. The hosted endpoint answers tools/list and tools/call without a token or sign-up. The example on this page was called that way on 2026-11-03.

Is it free?

Yes. The code is MIT licensed and the hosted endpoint is free to call. This server has no paid tier at all.

Where do the numbers come from?

Each result carries an as_of date and a source. In the live call on this page the source was https://www.irs.gov/pub/irs-drop/n-26-10.pdf ; https://www.irs.gov/irb/2026-29_irb ; https://www.irs.gov/tax-professionals/standard-mileage-rates. The full source list is in DATA_SOURCES.md in the repository.

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