Is Per Diem Taxable? Tax Home Rules for the Traveling Trades

Is per diem taxable? The short answer: usually not — as long as the work is genuinely away from your tax home, the assignment is temporary, and the payments stay inside the federal rules. Break one of those conditions and the same daily allowance can quietly turn into taxable wages. Here are the three rules that decide it, explained mechanically, with the primary sources linked — and one standing caveat: this page explains how the rules work; whether your situation qualifies is a question for your tax preparer.

Rule 1: You need a tax home — and it is not what it sounds like

The IRS “tax home” is not your house. It is your main place of work or business — the general area where you regularly earn your living. For a traveler who works assignment to assignment, the tax home question becomes: is there a regular place of abode you maintain and return to, with real, duplicated living costs while you are on the road?

Why it matters: per diem is only non-taxable when you are working away from your tax home. A worker the IRS classes as an itinerant — no regular abode, home is wherever the job is — has no tax home to be away from, and per diem for an itinerant is generally taxable income. The tests involve where you maintain a residence, whether you duplicate expenses, and where your ties are; the full mechanics are in IRS Publication 463 and in our plain-language tax home guide.

Rule 2: The assignment has to be temporary — the one-year rule

Away-from-home treatment applies to temporary assignments — and the IRS draws a bright line: work you realistically expect to last more than one year at a single location is treated as indefinite, not temporary, and the away-from-home benefits stop. The trap on long industrial projects is the moment expectations change: an assignment that starts as a six-month turnaround and gets extended into year two can change its tax character when the expectation changes, not just when the anniversary passes.

Practical consequence for the traveling trades: the multi-year megaproject an hour from a rented apartment is a very different tax animal than a string of shutdowns in different states, even if the paychecks look identical.

Rule 3: The per diem itself has to be paid right

Even with a solid tax home and a temporary assignment, the payment structure matters. Employer per diem generally stays out of the wage box when it runs through an accountable plan: the expense has a business connection, the time/place/purpose is substantiated, and amounts stay within the federal rates the GSA publishes for that county. Per diem paid over the federal rate without receipts, or paid with no substantiation requirements at all, can be treated as wages — it shows up on the W-2 and gets taxed like ordinary pay.

This is why the same $120/day can be tax-free money on one crew and taxable pay on another. The posting rarely tells you; the payroll setup does. It is a fair question to ask a recruiter before accepting.

What records actually protect you?

Every one of these rules is decided on records: where you were, when, for how long, and what it cost. The traveler who can show the days, the states, the receipts, and the duplicated home expenses is the traveler whose per diem survives scrutiny. Keep the log however you like — the RoadTrades tracker exists to do it automatically: day and state logging as the year unfolds, receipt scanning, mileage, and a year-end CPA pack that hands your preparer the whole picture — W-2 and 1099 assignments each handled correctly.

The bottom line

So — is per diem taxable? Not when three things hold: a real tax home you are genuinely away from, an assignment that stays temporary under the one-year rule, and payments that run through an accountable plan within the federal rates. Each rule has edges, the edges are where real money moves, and the specifics belong in a conversation with a preparer who can see your whole year. What RoadTrades can do is make sure that conversation starts with clean records — and that every job you weigh states its pay and per diem up front.