Mileage Reimbursement: IRS Rate, Accountable Plans, and Records

Mileage reimbursement is what an employer pays you for using your personal vehicle on the job, and for 2026 the IRS standard business rate is 72.5 cents per mile, up from 70 cents in 2025.¹ Federal law does not require most private employers to reimburse mileage at all. A few states do, and the Fair Labor Standards Act creates an indirect floor when unreimbursed driving costs pull your wages below the federal minimum.

The 2026 IRS Rate

The IRS publishes updated mileage rates each January. The business rate for 2026 is 72.5 cents per mile and reflects both fixed costs like insurance, depreciation, and registration and variable costs like fuel and maintenance. It applies equally to gasoline, diesel, hybrid, and fully electric vehicles.¹

Employers who reimburse at or below the IRS rate generally don’t have to report those payments as taxable income, provided the arrangement qualifies as an accountable plan. Reimbursements above the IRS rate trigger income tax and payroll tax on the excess.

Does Your Employer Have to Pay?

No federal statute requires private employers to reimburse mileage. The Fair Labor Standards Act governs wage floors, not expense reimbursement. It does, however, create an indirect requirement: if unreimbursed vehicle costs push your effective pay below the federal minimum wage of $7.25 an hour in any workweek, the employer is in violation.²³ That matters most for lower-wage workers who drive extensively, such as delivery drivers, home health aides, and field technicians.

The Department of Labor does not mandate a specific formula. It considers the IRS standard mileage rate per se reasonable, but employers can use other approaches — a flat rate per trip, a customized per-mile rate, or a fixed-and-variable allowance — so long as the method reasonably approximates the employee’s actual costs.²

A small number of states go further and require private employers to reimburse employees for all necessary business expenses, including vehicle costs. As of 2026, three states have explicit mandates on the books. These laws generally require coverage of all necessary expenditures an employee incurs as a direct result of performing the job, and they typically don’t cap reimbursement at the IRS rate; the standard is what the employee actually spent. Noncompliance can produce civil lawsuits and state labor department investigations. If you work in a state without such a law, your employer can legally pay nothing for business driving, as long as your net pay stays above the federal minimum. Check with your state labor department, since the landscape shifts as legislatures act.

Keeping Reimbursements Tax-Free: The Accountable Plan Rules

Whether your mileage payments show up as taxable wages depends almost entirely on whether your employer’s arrangement qualifies as an accountable plan under IRS rules. An accountable plan must meet three tests:⁴

A business connection: the expenses arise while you perform your job duties.
Adequate accounting: you substantiate each expense to your employer within a reasonable time. The IRS treats 60 days after the expense as a safe harbor.
Return of excess: if you receive more than the substantiated amount, you pay the difference back within a reasonable time.

When all three are met, reimbursements do not appear on your W-2 and are not subject to income tax or payroll tax. If any condition fails, the whole arrangement is treated as a nonaccountable plan, and the full payment gets reported as wages, subject to income tax withholding and FICA.⁵ An employer that pays generous mileage but never requires logs or receipts may inadvertently create a nonaccountable plan, turning every payment into taxable wages.

What Counts as Business Miles

The line between reimbursable business driving and personal commuting trips up more people than any other mileage question. Driving from your home to your regular workplace is commuting, and commuting is a personal expense regardless of distance.⁴ No tax-free reimbursement, no deduction.

Miles qualify as business when you travel between work locations during the day, visit a client or customer, attend a meeting away from your regular office, or run an errand for your employer.⁴ If you have a home office that qualifies as your principal place of business, trips from that home office to any other work location in the same trade or business count as deductible business travel rather than commuting.⁶ That distinction matters for remote workers who occasionally drive to a company office or client site.

What Records You Need

The IRS requires adequate records to substantiate any vehicle expense, whether you’re an employee seeking reimbursement or a self-employed worker claiming a deduction. Under the tax code, you must document four elements for every business trip: the amount, the date, the destination, and the business purpose.⁷ A compliant log captures:

The date of the trip.
Starting and ending locations, specific enough to be recognizable, not just “office” or “client.”
Miles driven. Odometer readings are the gold standard; GPS-based tracking apps are widely accepted.
A brief note on the business purpose, enough that someone reading it a year later understands why the trip happened.

The burden of proof sits with you. If you can’t produce records during an audit, the deduction is disallowed and your word alone won’t carry the day.⁸ Logging trips at or near the time they happen is far more credible than reconstructing a year’s driving at tax time. The IRS doesn’t require any specific format, so digital logs are as valid as handwritten ones.

Keep mileage logs and supporting documents for at least three years from the date you file the return that claims the deduction or reports the reimbursement. If you underreport gross income by more than 25%, the IRS has six years to audit, so records need to survive that long. If you never file a return for a given year, there’s no statute of limitations, and those records should be kept indefinitely.⁹

Doing the Math

Once your log is complete, multiply documented business miles by the applicable rate. An employee who drove 500 business miles in a month at the 2026 rate would calculate 500 × $0.725 = $362.50. That figure goes on your expense report or into your employer’s reimbursement portal. Parking fees and tolls for business trips are reimbursable separately.

Most employers process reimbursement requests through payroll portals or expense management software where you upload your log and any supporting documentation. Processing timelines vary; funds typically arrive by direct deposit. Under an accountable plan, these payments don’t appear on your paycheck as wages and aren’t taxed.⁴

If You’re Self-Employed: Standard Rate or Actual Expenses

Self-employed workers and independent contractors have a choice. Claim the standard mileage rate, or track and deduct actual costs. You can’t do both for the same vehicle in the same year.¹⁰

The standard rate is simpler: business miles times 72.5 cents, deducted on Schedule C (or Schedule F for farmers). The actual expense method requires tracking every cost of operating the vehicle, including fuel, oil, tires, repairs, insurance, registration, and depreciation or lease payments, then applying the business-use percentage.¹⁰

Two constraints matter. To use the standard mileage rate for a car you own, you must choose it in the first year the vehicle is available for business use; after that you can switch methods annually. For a leased vehicle, whichever method you pick applies for the entire lease including renewals. You also can’t use the standard rate if you operate five or more vehicles at the same time, or if you previously claimed accelerated depreciation or a Section 179 deduction on the vehicle.¹⁰

What Weak Records Cost You

Vehicle expenses are among the more common small-business audit triggers, and outcomes usually come down to records. If the IRS disallows a mileage deduction for lack of documentation, you owe the tax on that amount plus interest. The IRS can also assess an accuracy-related penalty of 20% of the underpaid tax if it finds negligence or careless disregard of the rules.¹¹

For a self-employed worker who deducts thousands of dollars in annual mileage, a disallowed deduction can produce a substantial bill quickly. Interest compounds on both the unpaid tax and any penalties until the balance is paid. Penalty relief is available if you can show reasonable cause and good faith, but “I didn’t keep a log” is not a defense the IRS accepts.¹¹

1
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents
2
U.S. Department of Labor. FLSA2020-12 – Opinion Letter Regarding Mileage Reimbursement
3
U.S. Department of Labor. State Minimum Wage Laws
4
Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
5
Internal Revenue Service. Revenue Ruling 2003-106
6
Internal Revenue Service. Revenue Ruling 99-7
7
Office of the Law Revision Counsel. 26 U.S. Code 274 – Disallowance of Certain Entertainment, Etc., Expenses
8
Internal Revenue Service. Burden of Proof
9
Internal Revenue Service. How Long Should I Keep Records
10
Internal Revenue Service. Topic No. 510, Business Use of Car
11
Internal Revenue Service. Accuracy-Related Penalty