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
No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.
https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcpWhat its tools do
5 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.
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
- 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
{
"tools": {
"listChanged": true
}
}Tools
5 advertised
get_mileage_rate — IRS standard mileage rates (2011-2026, incl. the July 2026 increase)
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 ($61,700 for 2026). 2027 rates are not announced yet and the tool says so.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"date": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"description": "A date the miles were driven; returns the rate in force that day (YYYY-MM-DD)."
},
"year": {
"type": "integer",
"maximum": 2100,
"minimum": 2011,
"description": "Tax year, e.g. 2026. Default 2026."
}
},
"additionalProperties": false
}{
"title": "IRS standard mileage rates",
"readOnlyHint": true,
"openWorldHint": false,
"idempotentHint": true,
"destructiveHint": false
}calculate_mileage_deduction — Mileage deduction or reimbursement calculator
Calculates the deduction or tax-free reimbursement for driven miles at the IRS standard mileage rates, splitting by the date each trip was driven. Applies the 2026 mid-year increase automatically (72.5 cents before July 1, 76 cents from July 1). Supports business, medical, charity and military moving miles, returns the amount per rate period and purpose, and the depreciation basis reduction for business miles. Notes who can and cannot deduct (employees' unreimbursed mileage is not deductible after the One, Big, Beautiful Bill Act).
{
"type": "object",
"$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
}{
"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)
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 $68 M&IE). Data from GSA's FY2026 and FY2027 ZIP code files, so it knows rates newer than a model's training data.
{
"type": "object",
"$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
}{
"title": "GSA per diem rates",
"readOnlyHint": true,
"openWorldHint": false,
"idempotentHint": true,
"destructiveHint": false
}calculate_trip_per_diem — Trip per diem calculator (GSA rates)
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.
{
"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
}{
"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
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 $5 incidental-expenses-only rate. Checks the 91 FY2027 high-cost localities and their seasonal portions (e.g. Tucson added, Panama City removed).
{
"type": "object",
"$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
}{
"title": "IRS high-low per diem",
"readOnlyHint": true,
"openWorldHint": false,
"idempotentHint": true,
"destructiveHint": false
}Prompts
Not advertised
Resources
Not advertised
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.
Claude Code
claude mcp add --transport http irs-mileage-rate-and-per-diem-mcp https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcpCodex
codex mcp add irs-mileage-rate-and-per-diem-mcp --url https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcpCursor
{
"mcpServers": {
"irs-mileage-rate-and-per-diem-mcp": {
"url": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp"
}
}
}Cline
{
"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
{
"servers": {
"irs-mileage-rate-and-per-diem-mcp": {
"type": "http",
"url": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp"
}
}
}Gemini CLI
gemini mcp add --transport http irs-mileage-rate-and-per-diem-mcp https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcpClaude Desktop
https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcpWindsurf
{
"mcpServers": {
"irs-mileage-rate-and-per-diem-mcp": {
"serverUrl": "https://irs-mileage-rate-per-diem-mcp.lipmichal.workers.dev/mcp"
}
}
}Let your agent find its tools
Find servers like IRS Mileage Rate and Per Diem MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.