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Per diem guides

Plain-English explanations of how federal and military per diem actually works — no jargon, no guessing.

What Is M&IE? Understanding the Meals & Incidental Expenses Per Diem
M&IE is a flat daily per diem you keep whether or not you spend it. Learn how it differs from lodging and the 75% first/last travel-day rule.
TDY Per Diem 101: How Temporary-Duty Travel Allowances Work
A plain-spoken guide to TDY per diem for federal civilian and military travelers: lodging caps, M&IE, CONUS vs OCONUS, and who sets the rates.
How to File a Travel Voucher in Plain English
A plain-English guide to filing a federal or military travel voucher: what you claim, receipts, the 75% first/last day rule, and common mistakes.

Rates shown are U.S. federal per diem rates for fiscal year 2026: GSA for the continental U.S., and DoD (DTMO) non-foreign OCONUS rates for Hawaii and Alaska. Lodging is reimbursed at actual cost up to the cap; M&IE is a flat daily allowance. See our methodology for details.

Perdiemify is an independent tool and is not affiliated with, endorsed by, or sponsored by the GSA or the U.S. Department of Defense. Information is provided for planning purposes and is not official travel guidance.

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