Per Diem Payments Are a Fixed Daily Rate for Work-Related Expenses

A per diem payment is a set amount of money your employer gives you each day to cover meals, lodging, and incidental expenses while you travel for work. Instead of asking you to save receipts and submit expense reports, your employer simply pays you a flat rate per day — you keep the money whether you spend it all or not.

The word "per diem" is Latin for "by the day." The payment is meant to simplify reimbursement: your employer avoids processing dozens of receipts, and you avoid the paperwork. The rate varies by location and employer. A per diem for a trip to rural Kansas will be lower than one for New York City, because the cost of meals and hotels differs.

Per diem is not the same as a travel advance or a reimbursement. A travel advance is money your employer gives you before the trip to spend on expenses. A reimbursement requires you to show receipts and get paid back for what you actually spent. Per diem is neither — it is a taxable payment for your time away, and you do not have to prove how you spent it.

Key Takeaways

  • Per diem is a fixed daily payment for meals and lodging during work travel, not a reimbursement requiring receipts.
  • The rate depends on your location and your employer's policy; the federal government publishes rates that many private employers follow.
  • Per diem is taxable income unless your employer follows IRS rules for accountable plans, which require you to return unused money.
  • You may receive per diem, a travel advance, or reimbursement — each method works differently and has different tax consequences.

How Per Diem Rates Are Set

Many employers use the General Services Administration (GSA) rates, which the federal government publishes for each U.S. county. These rates cover lodging, meals, and incidentals. For example, the GSA rate for a county might be $185 per day: $120 for lodging, $60 for meals and incidentals. If you travel within that county, your employer pays you $185 per day.

Some employers set their own per diem rates instead of following GSA tables. A large corporation might pay a flat $150 per day regardless of location, or it might pay higher rates for certain cities. Your employee handbook or travel policy will state which rate applies to you.

Per diem rates can also vary by trip length. Some employers pay a reduced rate on the first and last day of travel, since you may not need a full day's meals. A three-day trip might pay 100% per diem on days two and three, but only 75% on day one.

Tax Treatment of Per Diem Payments

Whether per diem is taxable depends on whether your employer has an accountable plan. Under an accountable plan, your employer can pay per diem without adding it to your taxable income — but only if you return any unused money and the per diem does not exceed the GSA rate for your location.

If your employer does not have an accountable plan, or if the per diem exceeds the GSA rate, the entire payment is taxable income. It appears on your W-2 and you pay income tax on it. This is common with smaller employers or those who pay a flat rate regardless of location.

To may have access to as an accountable plan, your employer must require you to account for your expenses (even if not with receipts — per diem itself counts as accounting), and you must return excess money within a reasonable time. If you receive $200 per day but only spend $150, you return the $50. If you do not return it, the $50 becomes taxable.

Per Diem Versus Reimbursement: When Each Is Used

Per diem works best for frequent or short trips where the cost of collecting receipts outweighs the benefit. A sales representative who travels weekly to nearby cities might receive per diem. A consultant who takes one trip per year to a conference might be reimbursed instead, because the employer wants to verify the actual cost.

Reimbursement requires you to submit receipts for every meal, hotel, and taxi fare. Your employer reviews them, approves them, and pays you back. This method gives the employer exact visibility into spending but creates more work for you and the accounting department.

Some employers use both: per diem for meals and incidentals, reimbursement for airfare and hotels. This splits the difference — the employer controls the largest expenses and simplifies the smaller ones.

How Per Diem Payments Appear on Your Paycheck

Per diem is usually added to your regular paycheck on the pay period after your trip ends. If you travel Monday through Wednesday and your paycheck runs Friday to Thursday, the per diem for those three days will appear on your next paycheck, which covers the following week.

On your pay stub, per diem may appear as a separate line item labeled "per diem," "travel allowance," or "daily allowance." If it is taxable (because your employer does not have an accountable plan), it is included in your gross income and subject to federal, state, and payroll taxes.

Some employers pay per diem separately from your regular paycheck — as a check or direct deposit that arrives a few days after your trip. This is less common but happens when the employer wants to keep travel expenses separate from payroll.

What Happens If You Receive Per Diem But Do Not Travel

If your employer pays you per diem for a trip that does not happen, or if you are paid per diem for days you did not actually travel, the money is taxable income. Your employer should not have paid it, and if discovered during an audit, the IRS may assess back taxes and penalties on both you and your employer.

If you receive per diem in error, report it to your payroll or accounting department immediately. They can correct it on your next paycheck or ask you to return the money. Do not assume it is a bonus or a gift — per diem is only meant to cover work-related travel expenses.

Per Diem for International Travel

The State Department publishes per diem rates for travel outside the United States. These rates are higher than domestic GSA rates because the cost of living varies widely by country. A per diem for London will be much higher than one for Mexico City.

If your employer sends you abroad, ask which rate they use — State Department rates, GSA rates, or their own policy. International per diem is still taxable unless your employer has an accountable plan and the rate does not exceed the published rate for that country.

Frequently Asked Questions

Do I have to return unused per diem money?

Only if your employer has an accountable plan. Under an accountable plan, you must return money you did not spend. If your employer does not have an accountable plan, you keep all the per diem regardless of what you actually spent. Check your employee handbook or ask payroll which type your employer uses.

Is per diem the same as a travel allowance?

Travel allowance is a broad term that can mean per diem, a travel advance, or a reimbursement. Per diem is a specific type of travel allowance — a fixed daily rate you do not have to account for with receipts. Always confirm with your employer which method they use.

What if my employer pays per diem but I do not travel?

Report it to payroll immediately. Per diem should only be paid for days you actually travel for work. If you were paid in error, the money is taxable income and should be returned or corrected on your next paycheck.

Can I negotiate a higher per diem rate?

Some employers will negotiate, especially if you travel frequently to high-cost cities. However, if your employer uses GSA rates or a published policy, they may not have flexibility. It is worth asking during salary negotiation or when discussing a new travel assignment.

Does per diem count as income for loan applications?

If per diem is taxable (added to your W-2), lenders may count it as income. If it is non-taxable under an accountable plan, it typically does not appear on your tax return and lenders will not see it. Bring your pay stubs and tax return to clarify with the lender.