Yes — the IRS mileage reimbursement does include gas. Fuel is already baked into the standard mileage rate, along with insurance, maintenance, tires, depreciation, and the other routine costs of running a vehicle. For 2026, the business rate is 72.5 cents per mile, and that one number is meant to cover all of it.1Internal Revenue Service. Notice 2026-10, 2026 Standard Mileage Rates You cannot claim gas as a separate deduction, and your employer cannot reimburse fuel on top of the per-mile rate without creating a tax problem. The only routine add-ons the IRS allows alongside the standard rate are business-related parking fees and tolls.
What the Per-Mile Rate Already Pays For
The IRS sets the standard mileage rate each year based on a study of what it actually costs to own and operate a car. The rate bundles two categories of expense into one number. Variable costs rise with every mile: gasoline, oil, tires, routine maintenance. Fixed costs are the ones you pay whether the car moves or not: insurance, registration, and depreciation or lease payments.2Internal Revenue Service. Topic No. 510, Business Use of Car Because everything is folded into the per-mile figure, you do not track or deduct any of those items individually when you use this method.
The rate applies the same way to gasoline, diesel, hybrid, and fully electric vehicles.3Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents If you drive an EV, the 72.5 cents is understood to cover your charging in place of someone else’s fuel. The IRS can adjust the rate mid-year when fuel prices move sharply, but that is rare.
The One Exception: Parking and Tolls
Business-related parking fees and tolls are deductible or reimbursable in addition to the standard mileage rate. The IRS treats them as separate transportation expenses rather than part of the per-mile figure.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses Keep the receipts, because a mileage log on its own will not substantiate them.
Parking at your regular workplace does not qualify. The IRS treats that as a personal commuting cost, and it is not deductible under either the standard rate or the actual expense method.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses
If Your Employer Reimburses You
Many employers pay a per-mile reimbursement for employees who use their own vehicles for work. When the payment is at or below 72.5 cents per mile and runs through a properly structured plan, it is not taxable income and does not appear as wages on your W-2.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses Because that per-mile figure already includes gas, you should not expect, or ask for, a separate fuel reimbursement on top.
The tax-free treatment depends on what the IRS calls an accountable plan. The plan has to meet three conditions: the expense must have a business connection, the employee must substantiate the miles to the employer within a reasonable time, and any amount paid in excess of what was substantiated must be returned. If any of those elements is missing, the entire reimbursement becomes taxable wages.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses
If an employer pays above the standard rate, the excess is taxable. An employer paying 80 cents per mile for 10,000 business miles would treat $7,250 (72.5 cents × 10,000) as nontaxable under code L in box 12 of the W-2, and the remaining $750 as taxable wages in box 1.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses
W-2 Employees Cannot Deduct the Shortfall
If your employer does not reimburse you, or reimburses at a rate well below your real costs, you cannot pick up the difference on your own tax return. The Tax Cuts and Jobs Act of 2017 suspended the miscellaneous itemized deduction that previously let W-2 employees write off unreimbursed business expenses, including mileage. That suspension was set to lapse after 2025, but the One Big Beautiful Bill Act, signed in mid-2025, made the elimination permanent.5U.S. House Committee on Ways and Means. The One, Big, Beautiful Bill – Section by Section For a W-2 employee, the employer’s policy is the only route to recover driving costs. If the policy pays nothing, there is no backdoor deduction for gas or anything else.
If You’re Self-Employed
Self-employed drivers deduct business mileage on Schedule C (or Schedule F for farming). The math is simple: business miles multiplied by 72.5 cents. Because gas is already inside the rate, you do not add fuel receipts on top; parking and tolls are the exception.
The first-year choice matters. For a vehicle you own, you must elect the standard mileage rate in the first year you use the car for business. If you use the actual expense method that first year instead, you cannot switch to the standard rate for that vehicle later. Going the other direction is allowed: you can start with the standard rate and move to actual expenses in a future year, though you will then be locked into straight-line depreciation.2Internal Revenue Service. Topic No. 510, Business Use of Car For a leased vehicle, you must stay with the same method for the entire lease. And if you operate a fleet of five or more vehicles at the same time, the standard rate is unavailable; you must use actual expenses.6Internal Revenue Service. Instructions for Schedule C (Form 1040)
Documentation is where mileage deductions most often fall apart. The IRS expects a log kept at or near the time of each trip, showing the date, destination, miles driven, and specific business purpose. A spreadsheet reconstructed from memory at tax time carries far less weight than a contemporaneous log.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses GPS-based mileage apps that let you classify trips on the spot are the easiest way to meet the standard.
Which Miles Count
Your daily drive from home to a regular workplace is never deductible, no matter the distance. The IRS treats commuting as personal, and the standard mileage rate does not change that classification. Two exceptions come up often. If you have a qualifying home office that is your principal place of business, trips from that office to a client or secondary work site in the same trade are deductible, even when the destination is permanent.4Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses And if you have a regular office away from home and travel to a temporary work location, the round trip from home is deductible. A location counts as temporary only if the assignment is realistically expected to last one year or less.7Internal Revenue Service. Topic No. 511, Business Travel Expenses Once you expect to be there longer than a year, those miles turn into nondeductible commuting.
When Tracking Actual Costs Beats the Standard Rate
If gas and other costs feel underpaid at 72.5 cents, the alternative is the actual expense method. You total up gas, oil, repairs, tires, insurance, registration, and depreciation (or lease payments), then multiply by your business-use percentage, which is the share of annual miles you drove for business.2Internal Revenue Service. Topic No. 510, Business Use of Car Under this method, gas is deducted directly, as a real line item, instead of being folded into a per-mile figure.
Actual expenses can produce a larger deduction when the vehicle is expensive, personal use is low, or repair bills are unusually high. The tradeoff is paperwork: every receipt, categorized, for the full year. Most drivers find the standard rate simpler unless the numbers clearly favor the alternative. Because that first-year election locks in much of what you can do later, running both calculations before the initial filing with a new vehicle is worth the time.