Compliance · August 3, 2026

Is per diem taxable? How per diem works, when per diem is taxed, and what employers have to report

Per diem is not taxable to the employee when it is paid under an accountable plan and does not exceed the federal per diem rate for the destination. Meet both conditions and nothing lands in taxable wages. Miss either one and it becomes ordinary compensation: any amount above the federal rate is taxable, and under a nonaccountable plan the entire allowance is taxable, reported in box 1 of Form W-2 and subject to withholding.

That is the whole answer, and almost every version of it you will read online stops one step short of the part that actually decides it. The federal rate gets all the attention because it is a number you can look up. The accountable plan gets almost none, even though it is the condition that fails most often in real companies, and it fails quietly, through paperwork nobody chased rather than through a rate somebody overpaid.

This is general information about how the rules work, not tax advice. Applying them to your specific facts is a conversation for your CPA or tax counsel.

How does per diem work?

Instead of reimbursing receipts line by line, the employer pays a flat daily allowance to cover lodging and meals while an employee travels away from home overnight. The employee still has to substantiate the time, place and business purpose of the trip, but not the amount of each individual meal. That is the trade: the company gives up precision and gets back the hours someone would have spent checking whether a sandwich was reasonable.

Two structural details matter before the tax question. First, "away from home" is a defined term, not a description. The IRS treats you as traveling away from home only if your duties require you to be away from the general area of your tax home substantially longer than an ordinary day's work, and you need sleep or rest to meet the demands of the work. Your tax home is the entire city or general area where your main place of business is, regardless of where your family lives. A long day trip with a late dinner is not away-from-home travel, so a per diem paid for it is simply wages.

Second, per diem has two components that behave differently. Lodging is one figure and meals and incidental expenses, universally abbreviated to M&IE, is another. The federal government reimburses its own travelers for actual lodging cost up to the maximum, while M&IE is a fixed daily amount, and federal rules do not allow mixing and matching between the two. Private employers are not bound by the Federal Travel Regulation and commonly pay a flat combined per diem, which is fine. The GSA figures still matter to you, because they define the federal rate that sets your tax-free ceiling.

What is the federal per diem rate for 2026?

For fiscal year 2026, which runs October 1, 2025 through September 30, 2026, GSA held rates flat at FY2025 levels. The standard CONUS rate is $110 for lodging plus $68 for meals and incidentals, $178 a day in total. About 300 non-standard areas carry their own higher rates, and M&IE across all locations is tiered from $68 to $92.

Employers who do not want to look up a city-by-city rate for every trip can use the IRS high-low substantiation method instead, published each year in a notice. Notice 2025-54 covers the current period.

Swipe the table sideways to compare all columns.

One proration rule catches people out. On the first and last day of travel, federal employees are eligible for only 75% of the M&IE rate, under FTR 301-11.101. A private employer paying a full day's M&IE on a departure day is paying above the federal rate for that day, and the excess is taxable even though the daily figure looks correct. This is the single most common way a well-intentioned policy creates small amounts of unreported wages, and it is entirely invisible unless your travel tool prorates automatically.

Is per diem taxable?

Not usually. Per diem is tax free to the employee when it is paid under an accountable plan and does not exceed the federal per diem rate for the destination. Anything paid above the federal rate is taxable wages. If the arrangement is not an accountable plan, the entire allowance is taxable regardless of how carefully it was calculated.

An accountable plan is not a document you sign, it is a set of three conditions your arrangement either meets or does not, set out in Publication 463. All three have to hold.

Swipe the table sideways to compare all columns.

When is per diem taxable?

Four situations turn a tax-free allowance into reportable wages. The allowance exceeds the federal rate for that location, in which case only the excess is taxable. The employee fails to substantiate time, place and business purpose within a reasonable period. The employee keeps an unspent excess instead of returning it. Or the arrangement is a nonaccountable plan, in which case the whole amount is income from the start.

There is a fifth that sits outside the plan rules entirely, and it is the one that surprises operations teams. If the trip involves no overnight stay, it is not away-from-home travel, and a "per diem" paid for it is just extra pay however it is labeled. The overnight rest requirement is doing real work in that sentence: a fourteen-hour day out of town with a drive home at the end does not qualify no matter how far the employee drove.

A sixth trap runs on a longer clock. Travel expenses are deductible for temporary assignments but not indefinite ones, and any work assignment expected to last more than one year is treated as indefinite. If someone realistically expects to work at a location for more than a year, the location becomes their tax home and per diem paid there is taxable, even if the assignment ends up being shorter. Consulting firms and construction contractors run into this constantly, usually in month thirteen of a project everyone swore would take nine.

How is per diem taxed?

The taxable portion is treated as ordinary wages. It goes in box 1 of Form W-2 and is subject to federal income tax withholding, Social Security and Medicare, exactly like salary. Nontaxable per diem paid at or below the federal rate under an accountable plan does not appear in box 1 at all, though employers commonly report it in box 12 with code L when a per diem or mileage allowance was used.

The practical consequence for the employee is that the money arrives twice in different clothes. The allowance itself lands in a travel reimbursement run, feels like expenses, and then a portion of it reappears months later inside taxable wages with tax already withheld against it. Anyone who is surprised by their box 1 figure in January should check whether travel allowances were rolled into it before assuming payroll made a mistake, since the W-2 numbers carry straight through to the return you file.

For self-employed contractors the framing changes. The accountable plan rules govern the employer and employee relationship. A contractor paid a per diem by a client is generally receiving business income, reported on Form 1099-NEC where the reporting threshold is met, and deducts allowable travel expenses against it. Self-employed taxpayers may use the federal per diem rate for meals and incidentals but not for lodging, where actual cost is required.

The meals rule that changed for 2026

One deduction change is worth flagging because it affects how the meals side of travel spend should be categorized this year. Under the One Big Beautiful Bill Act, the section 274(o) disallowance for employer-provided meals and company-cafeteria meals takes effect for tax years beginning after December 31, 2025, making those costs 100% nondeductible rather than 50% limited. Travel meals and client meals generally remain subject to the ordinary 50% limitation.

The action item is a bookkeeping one, not a policy one: if your chart of accounts lumps all meals into a single category, split it now, because the two buckets no longer receive the same treatment and reconstructing the split at year end from a mixed account is miserable work. How that treatment applies to your particular arrangements is a question for your tax advisor.

What this means for your travel policy

Three decisions come out of all of the above, and they are worth making deliberately rather than inheriting from whatever the last finance person set up.

Decide whether you are paying at the federal rate or above it. At or below, and the tax treatment takes care of itself. Above it, which some companies do intentionally to be competitive in expensive cities, and you have accepted a payroll obligation on the excess for every trip forever. That is a legitimate choice, but it should be a choice, not an accident caused by rounding a rate up to a memorable number.

Decide what "a reasonable period of time" means in your company and then enforce it. The substantiation requirement is the one that quietly fails, because nothing breaks when a report is late. Put a number on it, 30 or 60 days, write it into the policy, and have the system chase it. The structure for that document is covered in the travel and expense policy guide, and the substantiation records themselves are covered in IRS receipt requirements.

Decide whether your tooling can actually apply a destination rate and prorate the first and last day. This is a real filter when choosing software, because the difference between a system that looks up the GSA rate by city and trip date and one that lets a manager type a flat number into a box is the difference between compliance being automatic and compliance being someone's spreadsheet. Which vendors do this properly is part of what separates them in travel and expense management software.

Where per diem stops being the problem

Everything above is about getting the tax treatment right on money you have decided to spend. It matters, and it is the kind of thing that turns into an unpleasant conversation years later if you get it wrong. But it is worth being clear about what a correct per diem policy actually buys you: it makes travel spending compliant. It does nothing at all about whether the travel spending was too high.

Those are separate failures with separate fixes. The compliance failure is caught by rates, substantiation and payroll reporting. The spending failure, the team that burned its quarterly travel budget by week six, the hotel that charged a deposit twice, the conference registration that renewed itself, is only caught by seeing the transaction while there is still time to do something about it. A per diem policy is a rule about what you will pay. It is not a signal that tells you when you have paid too much, which is the gap real-time budget alerts are for.