The per diem deduction is one of the largest single tax benefits available to OTR owner-operators and one of the most commonly mishandled. The mechanics aren't complicated, but every part of them — the daily rate, the deductibility percentage, the partial-day rule, the documentation requirement — has specific rules that the IRS expects you to follow. A driver running 250+ nights away from home in a year is looking at a deduction in the high four to low five figures. Done right, it lowers the tax bill substantially. Done sloppily, it's the line item the IRS examiner asks about first if your return is reviewed.
What per diem actually is
Per diem (literally "per day") is a deduction in lieu of tracking actual meal expenses for days you're away from your tax home on business. Instead of saving every receipt for breakfast, lunch, and dinner across hundreds of road days, the IRS lets you deduct a standard daily amount.
For transportation workers — and OTR truckers qualify — the standard daily meal allowance is set by the IRS each fiscal year. As of late 2025, the standard rate for transportation workers is $69 per day for travel within the continental U.S. (CONUS) and $74 for travel outside CONUS (Canada, etc.). These rates update annually and you should verify the current rate for the year you're filing.
The per diem covers meals and incidental expenses (M&IE) only — not lodging (which truckers typically don't claim because they sleep in the truck), not transportation, not the cost of running the business. Just the daily food allowance.
The 80% deductibility rule
Most business meals are 50% deductible. Transportation workers under DOT hours of service rules get 80% deductibility on their per diem.
So a day's per diem deduction is:
$69 × 80% = $55.20 deductible per day (using the 2026 CONUS rate as an example)
For a driver away from home 250 days in the year:
250 × $55.20 = $13,800 deduction
That's the headline number. It directly reduces your Schedule C net income, which reduces both your SE tax and your federal income tax. The combined federal tax savings on $13,800 of deduction for an owner-operator in a 22% marginal bracket plus 15.3% SE tax is roughly $5,100 — real money.
What qualifies as a travel day
To claim per diem for a day, you need:
- Travel away from your tax home. Your tax home is where your business is based — typically your business residence. Travel away means a trip that's far enough you need to sleep or rest before returning.
- Overnight (or substantial rest) requirement. Day trips that don't require overnight or sleeper-berth rest don't qualify.
- Business purpose. The travel is for your motor carrier business — picking up, transporting, or delivering freight, or related business activity.
For most OTR operations, this is straightforward: any night spent in the sleeper berth away from your tax home is a qualifying day. Local or regional operations where the driver returns home most nights don't generate much per diem.
Partial-day rule
On days you depart from your tax home and days you return, you get 75% of the daily rate rather than the full rate. So:
- Full days on the road: 100% of $69 = $69 (then × 80% deductibility = $55.20)
- Partial days (departure and return): 75% of $69 = $51.75 (then × 80% = $41.40)
For a typical week-long OTR run: 5 full days + 2 partial days = 5 × $69 + 2 × $51.75 = $448.50 in per diem, of which 80% ($358.80) is deductible.
What records you actually need
The IRS wants documentation supporting:
- Which days you were away from home on business
- Where you traveled
- The business purpose of the travel
For OTR drivers, the ELD logs and dispatch records provide most of this naturally. The ELD shows where the truck was each day and whether the driver was on duty or in sleeper berth. The rate confirmations and BOLs show the business purpose (the freight being hauled).
You don't need to keep meal receipts when using the per diem method. The whole point of per diem is that the daily rate replaces actual expense documentation. But you do need to be able to show which days you were on travel — that's the documentation that matters.
A simple per diem log kept alongside the ELD data — date, departure city, destination city, away from home yes/no, full day or partial day — covers what the IRS examiner would ask for. Many trucking accounting software packages calculate per diem automatically from ELD data.
What you can't double-dip on
You can't deduct actual meal expenses and per diem for the same days. It's one or the other.
If you choose per diem for the year, you use it consistently — you can't switch back and forth between actual and per diem mid-year for the same trip.
If you have a co-driver on the same trip, each driver gets their own per diem. You don't share or split the daily rate.
How per diem flows into the tax return
For an owner-operator filing Schedule C (or Schedule C as an LLC), the per diem deduction appears as a line item under "Meals." The 80% portion is deducted; the 20% non-deductible portion isn't claimed.
Trucking-specific accounting and tax software typically handles the per diem calculation if you input your travel days correctly. For accountant-prepared returns, the accountant will ask for your nights-away count for the year and apply the calculation.
The per diem deduction is "above the line" in the sense that it reduces your business income — which lowers both your SE tax and your income tax. That's the dual benefit that makes it so valuable for high-mileage owner-operators.
What changed in recent years
Tax legislation has periodically adjusted business meal deductibility. The 80% rate for transportation workers under DOT HOS rules has been stable, but the general business meals deduction percentage has fluctuated — at one point it was temporarily 100% during a COVID-era provision, then reverted. For transportation workers specifically, the 80% rate is the long-standing rule and what you should plan on. Verify the current year's rate when filing, since both the per diem amount and the deductibility percentage are subject to legislative change.
Honest caveat: per diem isn't free money, and it interacts with home-office and lodging in complex ways
The per diem deduction is large and legitimate, but it does interact with other things in your tax return in ways that catch new owner-operators. A few examples: if you're also claiming a home-office deduction, your tax home calculation has to be consistent — you can't claim home office while also claiming your tax home is somewhere else. If you stay in motels occasionally (rather than the sleeper berth), the lodging deduction is separate from per diem and follows its own actual-expense or standard-rate rules. If your business has multiple locations (a home base and a regular satellite location), the tax home determination requires care. Most owner-operators don't run into these complications, but the ones who do — multi-truck fleets with corporate offices, owner-operators with significant local presence in addition to OTR — should work through them with an accountant rather than guessing. The standard owner-operator-running-solo-OTR case is the easy one; edge cases benefit from professional review.
The per diem deduction is one of the cleanest tax wins available to OTR drivers, and one of the most underused by drivers who keep their records too loosely to support the claim. The discipline is documentation: knowing which days you were on the road, in a form that would hold up to a review. The math from there is mechanical, and the savings are meaningful.
Working with a trucking-aware tax partner
Generic tax preparers sometimes miss the 80% transportation-worker rate and default to 50%, or miscount partial days, or fail to coordinate per diem with home office and lodging treatment. A tax preparer who works with OTR owner-operators every year does this calculation as a matter of routine. If you would like to be introduced to a vetted trucking-aware tax partner, see our #partner directory.
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