Per Diem Meaning: Definition, 2025-2027 Rates & Worked Example

What Per Diem Covers (and Who Can Use It, Travel vs. Daily Pay Uses in Business and Tax Rules

Per diem is a Latin phrase meaning "by the day" or "for each day." While some workplaces use the term to describe as-needed or shift-based daily staff, in business travel and tax law a per diem allowance replaces tracking and reimbursing every individual hotel or restaurant receipt on a business trip. To qualify as traveling away from your tax home, your duties must keep you away from your main place of work substantially longer than an ordinary workday, and you must need to stop for sleep or rest to meet the demands of your work.

How you use per diem depends on whether you are an employer reimbursing staff or a self-employed business owner deducting your own travel costs. Under the IRS Per Diem Payments FAQ, there is no standalone per diem rate for lodging by itself.

• Employers and employees: Can use either a combined per diem rate that covers both lodging and meals and incidental expenses (M&IE), or a meals-only per diem rate (the standard meal allowance) when the employer pays for the hotel directly or reimburses actual hotel receipts.
• Self-employed individuals: Can only use per diem (the standard meal allowance) for meal and incidental costs. You must deduct your actual cost for lodging using hotel receipts.
• Incidental expenses defined: Incidental expenses mean fees and tips given to porters, baggage carriers, hotel staff, and staff on ships. Incidental expenses do not include laundry, dry cleaning and pressing of clothing, lodging taxes, phone calls, or taxi fares between your hotel and restaurants.
• Incidental-expenses-only method: If you do not pay or incur any meal expenses on a travel day, you can deduct $5 per day for incidentals in any continental US (CONUS) or outside the continental US (OCONUS) locality instead of tracking actual tips.

• IRS: Publication 463 (2025), Travel, Gift, and Car Expenses
• IRS: ? Per Diem Payments

Federal Per Diem Rates for 2025, 2026, and 2027

Per diem rates follow the federal government's fiscal year, which runs from October 1 through September 30, and are based on the locality where you stop for sleep or rest. Employers and taxpayers can substantiate expenses using the regular federal locality rates published by the General Services Administration (GSA) or the simplified IRS high-low substantiation method.

For both the regular federal rate and the high-low method, you must prorate the standard meal allowance on partial days of travel (the day you depart and the day you return). You can claim 3/4 (75%) of the daily M&IE rate for each partial travel day, or use any proration method that you apply consistently in accordance with reasonable business practice.

By our calculation from IRS Notice 2026-60, the high-low per diem rate effective October 1, 2026, implies a lodging allocation of $243 per day in high-cost localities ($329 total minus $86 M&IE) and $156 per day in other CONUS localities ($230 total minus $74 M&IE), while the 75% partial-day M&IE allowance comes to $64.50 for high-cost areas and $55.50 for all other CONUS areas.

• IRS: 2026-2027 Special Per Diem Rates
• IRS: 2025-2026 Special Per Diem Rates

Worked Example: How Per Diem Math Works on a Trip

When an employer pays a per diem advance or allowance, the tax treatment depends on how the payment compares to the federal rate for that destination and whether the employee travels for all the advanced days. Here is a worked example showing how excess days and above-rate payments are handled.

• Shortened trip with a travel advance (Phoenix): Your employer sends you on a 5-day business trip to Phoenix in March 2025 and gives you a $450 advance ($90 per day for 5 days) to cover your M&IE. The federal M&IE rate for Phoenix is $86 per day. Your trip lasts only 3 days. Under your employer's accountable plan, you must return the $180 ($90 times 2 days) for the 2 days you did not travel. For the 3 days you did travel, you do not have to return the $12 difference between your allowance and the federal rate (($90 minus $86) times 3 days). Instead, your employer reports the non-taxable amount up to the federal rate in Box 12 of Form W-2 using Code L, and includes that $12 excess in Box 1 of Form W-2 as taxable wages.

• IRS: Publication 463 (2025), Travel, Gift, and Car Expenses
• IRS: ? Per Diem Payments

When Per Diem Is Taxable vs. Non-Taxable (Accountable Plan Checklist

Per diem payments are excluded from an employee's taxable wages only when paid under an accountable plan that meets 3 IRS rules: the expenses must have a business connection, the employee must adequately account for them within a reasonable period, and the employee must return any excess reimbursement within a reasonable period.

Use this checklist from the IRS safe harbor rules and Per Diem FAQ to keep per diem reimbursements tax-free:

• Issue advances no more than 30 days before the travel expense is paid or incurred.
• Collect a written or electronic expense report from the employee within 60 days after the trip.
• Verify that the expense report states the dates of departure and return, the destination city or town, and the business purpose of the trip.
• Attach lodging receipts if you are reimbursing actual hotel costs alongside a meals-only per diem rate (receipts are also required for any non-per-diem expense of $75 or more, and for all lodging when not using a combined lodging-and-M&IE per diem).
• Collect any unspent or unproven travel advances from the employee within 120 days after the expense was paid or incurred.
• Withhold income and employment taxes on any per diem amount when no expense report is filed, when a flat allowance is paid without requiring a report, when unreturned advances remain after 120 days, or on the dollar amount paid above the federal rate.

• IRS: Publication 463 (2025), Travel, Gift, and Car Expenses
• IRS: ? Per Diem Payments

Deduction Limits for Self-Employed Owners and Contractors

If you are self-employed, you can use the standard meal allowance to calculate your meal and incidental deduction instead of saving restaurant receipts, provided you keep records proving the time, place, and business purpose of every trip. However, you cannot deduct the full per diem rate on your return.

You can generally deduct only 50% of your unreimbursed business meals, whether you use actual meal costs or the standard meal allowance. For example, if you claim the $68 standard CONUS meal allowance for a full day of business travel, your deductible meal expense for that day is $34. If your work is subject to the Department of Transportation's hours of service limits (such as certain interstate truck drivers, airline crews, railroad workers, and merchant mariners), you can deduct 80% of your business meal allowance instead of 50%.

When an independent contractor travels for a client, the 50% meal limit falls on the contractor unless the client reimburses the meals and the contractor provides adequate records of the expenses to the client. If a contractor does not adequately account to the client for reimbursements and allowances, the client does not have to keep the travel records, deducts the payment as a service cost without the 50% limit, and must include the reimbursements on Form 1099-MISC if total fees and reimbursements to that contractor reach $600 or more in the calendar year.

• IRS: Publication 463 (2025), Travel, Gift, and Car Expenses
• IRS: ? Per Diem Payments

Tax Forms and Official Lookup Pages That Use Per Diem

Per diem allowances and standard meal deductions flow to specific lines on federal tax returns depending on your employment status, and rates are published across 3 federal agencies depending on where you travel.

• Form W-2 (Wage and Tax Statement): Employers report non-taxable per diem up to the federal rate in Box 12 (Code L) only when the total allowance paid exceeds the federal rate. Any excess over the federal rate, or any payment under a nonaccountable plan, goes in Box 1 as taxable wages.
• Schedule C (Form 1040), Profit or Loss From Business: Sole proprietors and statutory employees report deductible travel expenses other than meals (such as airfare and actual hotel costs) on Line 24a, and report 50% of their deductible standard meal allowance (or 80% for DOT workers) on Line 24b.
• Schedule F, Profit or Loss From Farming: Self-employed farmers report travel expenses and 50% of their non-entertainment business meals on Line 32.
• Form 2106 (Employee Business Expenses) and Schedule 1: Due to the suspension of miscellaneous itemized deductions for tax years beginning after 2017, Form 2106 may only be used by Armed Forces reservists traveling more than 100 miles from home, qualified performing artists, fee-basis state or local government officials, and employees with impairment-related work expenses. Eligible reservists, performing artists, and fee-basis officials carry their deduction from Form 2106, Line 10, to Schedule 1, Line 12.
• Form 1099-MISC: Filed by businesses that pay $600 or more in total fees and unaccounted-for expense reimbursements to an independent contractor during the calendar year.
• Official Rate Lookup Portals: Continental US (CONUS) rates are published by the General Services Administration at GSA.gov/travel/plan-book/per-diem-rates. Non-foreign OCONUS rates (Alaska, Hawaii, Puerto Rico, and US territories) are set by the Department of Defense at Travel.dod.mil, and foreign international rates are set by the Department of State at aoprals.state.gov.
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• IRS: Publication 463 (2025), Travel, Gift, and Car Expenses
• IRS: ? Per Diem Payments