Per Diem

Per Diem in plain English

Per diem generally refers to an allowance method connected to travel expenses, but applicable rates and rules need current-year review. For transportation workers, including long-haul truck drivers, the IRS publishes a special transportation industry per diem rate that differs from the standard federal rate. The rate applies per day the driver is away from home overnight for business. Only a portion of the daily per diem amount is deductible — the applicable percentage is set by the IRS and has changed over time. Keeping a log that records destination, business purpose, and departure and return dates supports any per diem claim if records are reviewed.

Where Per Diem shows up

Per diem shows up in discussions about meal expenses on overnight business trips. For truck drivers, the IRS publishes specific transportation industry per diem rates that differ from the general federal rate. The applicable rate, documentation requirements, and limits need current-year verification because the IRS adjusts these figures. Per diem is one component of the total expense picture for an owner-operator's Schedule C.

How Per Diem shows up in records

Per diem support is usually a trip log, dispatch record, ELD history, or calendar showing nights away from home. Keep the verified rate source with the tax-year folder rather than relying on memory. If the rate was entered into a tracker, save the rate, date range, and partial-day method used so the preparer can see how the total was built.

Verify Per Diem before filing

Definitions can depend on the form, tax year, or jurisdiction. Verify current official instructions before relying on a term for filing.

What Per Diem does not decide

This definition does not decide whether a specific truck, trip, expense, payment, or filing position qualifies under current rules. Use the term to identify which records matter, then review the linked guide page and official instructions before applying it to a return, registration, IFTA report, or tax payment.

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