Koskamo

IRS Mileage Rate and Per Diem MCP

This MCP server provides AI assistants with up-to-date IRS standard mileage rates (2011-2026) and GSA per diem rates for all ZIP codes for FY2026 and FY2027. It supports calculating mileage deductions, per diem expenses, and high-low per diem rates, with all figures sourced directly from irs.gov and gsa.gov.

Endpoint and access

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IRS Mileage Rate and Per Diem MCP logo, by ZovoCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-07Published by Zovo
MCP endpoint (Streamable HTTP)
https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp
Vendor documentation

What its tools do

5 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

5 of 5 have a description · 5 of 5 declare behavior hints · 5 of 5 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Retrieve IRS standard mileage rates for business travel
  • Calculate mileage deductions or reimbursements by date
  • Get GSA lodging and M&IE per diem rates by ZIP code
  • Determine IRS high-low per diem rates for specific cities

Source and maintenance

Community listingRegistry 1.0.0
Maintenance checked

Protocol and capabilities

Server
irs-mileage-rate-per-diem-mcp 1.0.0
MCP protocol negotiated in check
2025-11-25
Tools
5 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Tools

5 advertised

get_mileage_rate — IRS standard mileage rates (2011-2026, incl. the July 2026 increase)
Advertised by the server during the last successful anonymous check.
Advertised read-only

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. Knows the mid-year 2026 change: 72.5 cents for business from Jan. 1 to June 30, 2026 (Notice 2026-10) and 76 cents from July 1, 2026 (Announcement 2026-11, fuel price increase), medical/moving 20.5 then 23.5 cents, charity 14 cents. Also returns the depreciation (basis reduction) part of the business rate (35 cents for 2026) and the FAVR / employer-vehicle maximum value ($61,700 for 2026). 2027 rates are not announced yet and the tool says so.

get_mileage_rate input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "A date the miles were driven; returns the rate in force that day (YYYY-MM-DD)."
    },
    "year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 2011,
      "description": "Tax year, e.g. 2026. Default 2026."
    }
  },
  "additionalProperties": false
}
get_mileage_rate annotations
{
  "title": "IRS standard mileage rates",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
calculate_mileage_deduction — Mileage deduction or reimbursement calculator
Advertised by the server during the last successful anonymous check.
Advertised read-only

Calculates the deduction or tax-free reimbursement for driven miles at the IRS standard mileage rates, splitting by the date each trip was driven. Applies the 2026 mid-year increase automatically (72.5 cents before July 1, 76 cents from July 1). Supports business, medical, charity and military moving miles, returns the amount per rate period and purpose, and the depreciation basis reduction for business miles. Notes who can and cannot deduct (employees' unreimbursed mileage is not deductible after the One, Big, Beautiful Bill Act).

calculate_mileage_deduction input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "trips"
  ],
  "properties": {
    "trips": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "miles",
          "date"
        ],
        "properties": {
          "date": {
            "type": "string",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "description": "Date driven, or any date in the period (e.g. 2026-03-15 for all January-June 2026 miles) (YYYY-MM-DD)."
          },
          "miles": {
            "type": "number",
            "maximum": 1000000,
            "minimum": 0,
            "description": "Miles driven."
          },
          "purpose": {
            "enum": [
              "business",
              "medical",
              "charity",
              "moving"
            ],
            "type": "string",
            "description": "business (default), medical, charity or moving."
          }
        },
        "additionalProperties": false
      },
      "maxItems": 1000,
      "minItems": 1,
      "description": "Trips or mileage totals, each with a date."
    },
    "default_purpose": {
      "enum": [
        "business",
        "medical",
        "charity",
        "moving"
      ],
      "type": "string",
      "description": "Purpose for trips that do not set one. Default business."
    }
  },
  "additionalProperties": false
}
calculate_mileage_deduction annotations
{
  "title": "Mileage deduction calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
get_per_diem_rates — GSA per diem rates by ZIP or city (FY2026 and FY2027)
Advertised by the server during the last successful anonymous check.
Advertised read-only

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 incidental expenses (M&IE) rate with its breakfast/lunch/dinner/incidentals breakdown and the 75% first/last-day amount. Covers FY2026 (Oct. 1, 2025 - Sept. 30, 2026) and FY2027 (from Oct. 1, 2026; standard rate $113 lodging and $68 M&IE). Data from GSA's FY2026 and FY2027 ZIP code files, so it knows rates newer than a model's training data.

get_per_diem_rates input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "zip": {
      "type": "string",
      "pattern": "^\\d{5}(-\\d{4})?$",
      "description": "5-digit ZIP code of the destination (best match)."
    },
    "city": {
      "type": "string",
      "maxLength": 80,
      "minLength": 2,
      "description": "City or county name, e.g. \"Boston\" or \"Maricopa\"."
    },
    "date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Travel date; picks the fiscal year and shows that night's lodging rate (YYYY-MM-DD)."
    },
    "state": {
      "type": "string",
      "maxLength": 30,
      "minLength": 2,
      "description": "2-letter state code, e.g. MA."
    },
    "fiscal_year": {
      "type": "integer",
      "maximum": 2027,
      "minimum": 2026,
      "description": "Federal fiscal year (2027 = Oct. 2026 - Sept. 2027). Default: the current one."
    }
  },
  "additionalProperties": false
}
get_per_diem_rates annotations
{
  "title": "GSA per diem rates",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
calculate_trip_per_diem — Trip per diem calculator (GSA rates)
Advertised by the server during the last successful anonymous check.
Advertised read-only

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 for each day with 75% on the first and last day, minus meals provided at the GSA breakdown amounts. Uses the official FY2026 and FY2027 GSA rates for trips between Oct. 1, 2025 and Sept. 30, 2027.

calculate_trip_per_diem input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "start_date",
    "end_date"
  ],
  "properties": {
    "zip": {
      "type": "string",
      "pattern": "^\\d{5}(-\\d{4})?$",
      "description": "5-digit ZIP code of the destination (best match)."
    },
    "city": {
      "type": "string",
      "maxLength": 80,
      "minLength": 2,
      "description": "City or county name, e.g. \"Boston\" or \"Maricopa\"."
    },
    "state": {
      "type": "string",
      "maxLength": 30,
      "minLength": 2,
      "description": "2-letter state code, e.g. MA."
    },
    "end_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Last travel day (YYYY-MM-DD)."
    },
    "start_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "First travel day (YYYY-MM-DD)."
    },
    "meals_provided": {
      "type": "object",
      "properties": {
        "lunch": {
          "type": "integer",
          "maximum": 366,
          "minimum": 0
        },
        "dinner": {
          "type": "integer",
          "maximum": 366,
          "minimum": 0
        },
        "breakfast": {
          "type": "integer",
          "maximum": 366,
          "minimum": 0
        }
      },
      "description": "Number of meals provided (by a conference or the employer) to deduct from M&IE.",
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}
calculate_trip_per_diem annotations
{
  "title": "Trip per diem calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
get_high_low_per_diem — IRS high-low per diem rates and high-cost localities
Advertised by the server during the last successful anonymous check.
Advertised read-only

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 treated as meals (Notice 2026-60); Oct. 1, 2025 - Sept. 30, 2026 $319 / $225 (Notice 2025-54). Also the transportation industry M&IE ($80 CONUS, $86 OCONUS) and the $5 incidental-expenses-only rate. Checks the 91 FY2027 high-cost localities and their seasonal portions (e.g. Tucson added, Panama City removed).

get_high_low_per_diem input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "city": {
      "type": "string",
      "maxLength": 80,
      "minLength": 2,
      "description": "City or county to test against the high-cost list."
    },
    "date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Travel date. Default today (YYYY-MM-DD)."
    },
    "state": {
      "type": "string",
      "maxLength": 30,
      "minLength": 2,
      "description": "2-letter state code or state name."
    }
  },
  "additionalProperties": false
}
get_high_low_per_diem annotations
{
  "title": "IRS high-low per diem",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
319 ms
95th percentile latency
319 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 319 ms · metadata changed · 5 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http irs-mileage-rate-and-per-diem-mcp https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add irs-mileage-rate-and-per-diem-mcp --url https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable irs-mileage-rate-and-per-diem-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "irs-mileage-rate-and-per-diem-mcp": {
      "url": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "irs-mileage-rate-and-per-diem-mcp": {
      "type": "streamableHttp",
      "url": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start irs-mileage-rate-and-per-diem-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "irs-mileage-rate-and-per-diem-mcp": {
      "type": "http",
      "url": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http irs-mileage-rate-and-per-diem-mcp https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "irs-mileage-rate-and-per-diem-mcp": {
      "serverUrl": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

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