The national average for mileage reimbursement tracks the IRS standard business mileage rate, which is 72.5 cents per mile for 2026.1Internal Revenue Service. 2026 Standard Mileage Rates Most private employers and government agencies anchor their reimbursement policies to this figure because paying at or below it keeps the money tax-free for the employee and fully deductible for the employer. There is no federal law setting an “official” reimbursement rate, but the IRS number functions as the de facto standard across the country.
2026 IRS Mileage Rates
The IRS updates its mileage rates each year based on an independent study of what it costs to own and operate a vehicle. For 2026:
- Business driving: 72.5 cents per mile
- Medical purposes: 20.5 cents per mile
- Military moving (active duty under permanent change of station orders only): 20.5 cents per mile
- Charitable volunteering: 14 cents per mile
The business, medical, and military rates move each year with fuel prices, insurance costs, and depreciation trends.1Internal Revenue Service. 2026 Standard Mileage Rates The charitable rate is fixed at 14 cents by statute, so it doesn’t change with economic conditions.2Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts
When people ask about a “national average,” the 72.5-cent business rate is almost always what they mean. Employers use it because it lines up with the IRS ceiling for tax-free reimbursement.
What the Rate Actually Covers
The per-mile figure isn’t a gas allowance. It’s a single number meant to cover every ordinary cost of running a personal vehicle: fuel, oil, tires, maintenance, repairs, insurance, registration, and depreciation. Of the 72.5-cent business rate for 2026, the IRS treats 35 cents as depreciation — the gradual loss of your vehicle’s value over time.1Internal Revenue Service. 2026 Standard Mileage Rates
Parking and tolls tied to a business trip are not built into the rate. You can claim those on top of your mileage, as long as they’re for business travel and not for parking at your regular workplace or tolls on your daily commute.3Internal Revenue Service. Car and Truck Expense Deduction Reminders
Why Employers Pay the IRS Rate
The tax treatment of reimbursement is the reason the IRS rate dominates. Under an “accountable plan,” a reimbursement is excluded from your gross income and never appears on your W-2. Three conditions have to be met: the expense must have a business connection, you must substantiate it with records, and you must return anything paid in excess of your documented expenses.4eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
An employer that reimburses at or below 72.5 cents per mile and requires proper mileage logs will generally meet those conditions, so the money reaches you tax-free. Two arrangements break that:
- If an employer pays more than 72.5 cents per mile, the amount above the IRS rate is treated as taxable income and runs through income tax withholding and payroll taxes.
- If an employer hands out a flat car allowance without requiring mileage substantiation, the entire allowance is treated as taxable wages because it doesn’t meet accountable plan rules.4eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
That’s why a flat monthly car allowance that looks generous on paper can shrink after taxes, while a documented per-mile reimbursement at the IRS rate arrives whole.
Commuting Miles Don’t Count
The most common mistake is treating the daily commute as reimbursable. Driving from home to your regular workplace and back is a personal expense, no matter the distance, and it is never reimbursable or deductible.5Internal Revenue Service. Topic No. 511, Business Travel Expenses Business miles start when you leave your regular workplace to travel to a client site, a second office, a meeting, or another work destination. If your home office qualifies as your principal place of business, trips from home to client sites generally do count.
Temporary assignments follow a separate rule. If you have a regular office and your employer sends you to a temporary site expected to last a year or less, the drive from home to that temporary site counts as business travel.6Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses Once the assignment is expected to last longer than a year, or actually does, that location becomes your new regular workplace and the drive becomes a non-reimbursable commute.
Is Your Employer Required to Reimburse You?
No federal law directly requires employers to reimburse mileage. The Fair Labor Standards Act creates an indirect floor through what’s known as the “kickback” rule. If unreimbursed work expenses — including the cost of driving your own car for deliveries or other job duties — pull your effective hourly pay below the federal minimum wage of $7.25, the employer has violated the FLSA.7eCFR. 29 CFR 531.35 – Free and Clear Payment; Kickbacks The same logic applies to overtime pay.
The rule is most consequential for delivery drivers, home health aides, and other workers whose pay sits close to the minimum wage and whose jobs demand heavy personal vehicle use.8U.S. Department of Labor. Handy Reference Guide to the Fair Labor Standards Act
Some states go further and require employers to reimburse necessary business expenses, including mileage, though the scope of those laws varies. In states with mandatory reimbursement statutes, employers who don’t pay can face penalties, back-pay claims, and labor department investigations. If you’re not sure where your state stands, check with your state’s department of labor.
Documenting Your Miles
Reimbursement at the IRS rate depends on records. For every business trip, you need to capture the date, the destination, the business purpose, and the mileage — either odometer readings or total trip miles.6Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses A paper log, a spreadsheet, or a mileage tracking app all work, as long as entries are consistent and made in real time rather than reconstructed later. If you keep electronic records, the IRS expects exact copies of the original entries, not condensed summaries.9Internal Revenue Service. Use of Electronic Accounting Software Records: Frequently Asked Questions and Answers Without that documentation, even a reimbursement at the correct rate can lose its tax-free status.