Per Diem Meaning: What Per Diem Covers on Business Trips
Per diem is a fixed daily allowance an employer pays to cover an employee's lodging, meals and incidental expenses while traveling away from home for work. Instead of reimbursing every receipt, the company pays a set amount for each day of the trip, often based on federal rates published for each city and county.
If your crew lead spends two nights on a job in a standard-rate town, the company can pay up to $113 a night for the room and $68 per full day of meals and incidentals tax-free under fiscal year 2027 federal rates.
What per diem means in practice
Per diem is Latin for "per day," and that is how the money works. One flat amount per travel day, agreed before the trip. The employee doesn't prove what dinner cost. They prove the dates, the place and the business reason, and if they eat for less than the allowance, they keep the difference.
Most per diems have two parts. Lodging covers the hotel room. M&IE, short for meals and incidental expenses, covers food and small tips. Some companies pay both as one daily rate. Others book the hotel themselves and pay a per diem for M&IE only.
Per diem does not cover the rest of the trip. Airfare, rental cars, fuel, parking, mileage and conference fees are reimbursed separately. Lodging taxes aren't part of it either, because the federal lodging cap is set before tax.
What counts as an incidental expense
Incidentals are narrower than most people assume. The IRS defines them as fees and tips given to porters, baggage carriers, hotel staff and staff on ships. Laundry, lodging taxes, phone calls and the cab from your hotel to a restaurant don't count. If your policy covers them, reimburse them separately against receipts. In the federal breakdown, incidentals are $5 of the $68 daily M&IE.
Federal per diem rates for fiscal year 2027
The General Services Administration (GSA), the agency that runs travel rules for federal employees, sets a rate for every location in the continental United States, or CONUS.
The federal fiscal year runs from October 1 to September 30, so new rates arrive every fall. GSA Per Diem Bulletin FTR 27-01 sets these standard amounts for travel from October 1, 2026, through September 30, 2027:
| Standard CONUS rate | FY 2026 | FY 2027 |
|---|---|---|
| Lodging, per night, before taxes | $110 | $113 |
| M&IE, per full day | $68 | $68 |
| Total, per full day | $178 | $181 |
The standard rate applies wherever GSA hasn't set a higher one, which is about 85 percent of CONUS counties. Another 295 locations get a higher lodging cap, and M&IE runs in tiers from $68 to $92 a day depending on the place.
GSA splits the $68 tier into $16 for breakfast, $19 for lunch, $28 for dinner and $5 for incidentals. On the first and last day of a trip, federal travelers get 75 percent, or $51. The M&IE breakdown matters when a client feeds your crew and your policy deducts that meal.
The IRS high-low method
Looking up a rate for every town takes time, so the IRS offers a shortcut called the high-low method: one flat rate for a published list of high-cost places and one for the rest of CONUS. A high-cost locality is one with a federal per diem of $280 or more.
Under IRS Notice 2026-60, the high rate is $329 a day and the low rate is $230 for per diem paid for travel on or after October 1, 2026. Of those, $86 and $74 count as meals.
The last three months of the year follow a timing rule. An employer has to stay with the method it used from January through September, so a company that wasn't using high-low then can't start until January 1, 2027. A company already on it can keep last year's $319 and $225 rates through December 31 or move to the new ones, as long as every employee gets the same table.
A quick per diem example
A 12-person electrical contractor sends its foreman to a job in a standard-rate county. He leaves Monday morning and drives home Wednesday evening, two nights in all. Company policy follows the FY 2027 federal rates and pays 75 percent of M&IE on travel days.
| Day | Lodging | M&IE | Total |
|---|---|---|---|
| Monday, travel day | $113 | $51 | $164 |
| Tuesday, full day | $113 | $68 | $181 |
| Wednesday, travel day | $0 | $51 | $51 |
| Trip total | $226 | $170 | $396 |
If the company books and pays the motel itself, the foreman's per diem is the M&IE column alone: $170. Our guide on how to calculate per diem for business travel covers choosing between the standard and high-low methods and setting a company policy.
How per diem is taxed
Paid the right way, per diem is not income for the employee. The right way is an accountable plan, the IRS name for a reimbursement policy that meets three rules set out in Publication 463:
- The expense has a business connection.
- The employee accounts for it within a reasonable time.
- The employee returns any excess within a reasonable time.
The IRS automatically treats the timing as reasonable if the employee accounts for the trip within 60 days after the expense and returns any excess within 120 days after it, or within 120 days of an employer statement, sent at least quarterly, asking for it. The employee shows the time, place and business purpose of the trip, and the allowance stands in for the receipts up to the federal rate.
The excess to hand back is money for days the employee can't show they traveled. The part of a proven day's allowance above the federal rate stays with the employee, but as wages. Say a company pays $80 a day for M&IE to a tech who spends four full days in a $68 area. The first $272 (4 x $68) goes in box 12 of the tech's Form W-2, the annual wage statement, with code L, and isn't taxed. The other $48 (4 x $12) lands in box 1 as ordinary pay.
Pay per diem under a nonaccountable plan, one with no travel records behind it, and the whole payment is taxable.
What employees and owners should know
Tax-free per diem needs real travel. The IRS counts you as away from home when work keeps you out of the general area of your tax home, meaning your regular place of business, for substantially longer than an ordinary workday and you need sleep or rest to do the job. A long day trip doesn't qualify.
Long jobs have a limit. An assignment realistically expected to last more than a year is indefinite, the job site becomes your tax home, and per diem paid there is taxable. That catches crews on multi-year builds.
If your employer pays less than you spend, you usually can't deduct the gap on your federal return. Only a few groups, such as Armed Forces reservists, still can.
Owners face extra rules. If you own more than 10 percent of your corporation's stock, a lodging-and-meals per diem won't prove your costs to the IRS, so keep the receipts and ask your CPA about meals-only allowances.
A self-employed person can use the federal M&IE rate, called the standard meal allowance, instead of tracking every meal. There is no standard amount for lodging, so the hotel is deducted at what you paid. Meals are generally 50 percent deductible, or 80 percent for workers under Department of Transportation hours-of-service rules, such as interstate truck drivers and bus drivers. Your CPA can confirm how this applies to your entity.
Common per diem mistakes
Four habits turn tax-free per diem into wages:
- Paying a flat weekly "per diem" with no record of where the employee slept.
- Paying lodging per diem on nights the company already paid the hotel.
- Advancing a full week and not collecting back the days the trip was cut short.
- Prorating travel days one way for some employees and another way for others.
A written travel reimbursement policy closes all four gaps, as long as someone checks trips against it. Name the rate source, the travel-day rule and the deadline for turning in trip details.
Tracking per diem with the rest of the trip
Per diem settles lodging and meals, but the rest of a trip still runs on receipts: fuel, parking, materials grabbed on the way, miles driven in a personal truck. If your crews pay for those out of pocket, Clyr handles them as employee reimbursements and mileage. The employee photographs the receipt, the expense is coded to the job the same way card spend is, and it goes through your approval policy before syncing to your books. Miles get logged from a no-login link, with no app to install.
FAQs
Usually not. If your per diem is at or below the federal rate and you report your travel dates, place and purpose, it doesn't show up in box 1 of your W-2 at all. If your employer pays more than the federal rate, look for code L in box 12. That figure is the tax-free part, and the rest is already counted in your wages.
No. GSA sets rates for federal travelers, and a private company can pay whatever its policy says. The federal rates matter because they mark the ceiling for tax-free treatment, and paying less can leave your people out of pocket. Matching the GSA rates keeps you at that ceiling. The high-low rates work too, but a company not already using them can only start on January 1.
Once a year on a fixed schedule, though GSA can revise a single location's rate mid-year, so check the lookup before each trip. The IRS high-low notice usually lands in September. From October through December, employers can stay on the old rates or move to the new ones, but they can't switch methods until January.
Outside of travel, per diem also describes work paid by the day. A per diem nurse, for example, is called in as needed and paid for each shift instead of earning a fixed salary. It has nothing to do with travel allowances.
