To deduct business fuel costs on your taxes, you pick one of two methods and report the result on Schedule C. The standard mileage rate bundles fuel and other vehicle costs into a flat per-mile figure, set at 72.5 cents per mile for 2026.1Internal Revenue Service. The Standard Mileage Rates and Maximum Automobile Fair Market Values Have Been Updated for 2026 The actual expense method tracks what you really spend on fuel and other operating costs, then deducts the business-use share. If your equipment burns fuel off public roads, a separate federal credit refunds the excise tax on that fuel.
What Counts as a Deductible Fuel Expense
Fuel is deductible when it powers a vehicle or machine used for a clear business purpose. Driving to clients, hauling materials between job sites, making deliveries, and running generators, tractors, or construction equipment all qualify. The governing rule is Internal Revenue Code Section 162: the expense has to be “ordinary and necessary” in carrying on your trade or business.2Office of the Law Revision Counsel. 26 US Code 162 – Trade or Business Expenses
Your daily commute never qualifies. Federal regulations disallow the cost of traveling between your home and your regular workplace.3eCFR. 26 CFR 1.274-14 – Disallowance of Deductions for Certain Transportation and Commuting Benefit Expenditures If you run a qualifying home office that is your principal place of business, trips from there to client sites or secondary work locations are generally deductible because no commute is involved.
When one vehicle serves both business and personal use, only the business share is deductible. Drive 10,000 miles in a year with 6,000 for business, and 60% of your fuel costs count.4Internal Revenue Service. Topic No. 510, Business Use of Car That percentage is the number auditors scrutinize first, so track it as you go rather than guessing at tax time.
Standard Mileage Rate or Actual Expenses
You choose one method per vehicle. The right choice depends on how much your vehicle actually costs to run and how much paperwork you want to keep.
The Standard Mileage Rate
The simpler route is a flat per-mile amount that already includes fuel, depreciation, insurance, and maintenance. For 2026 that rate is 72.5 cents per mile.1Internal Revenue Service. The Standard Mileage Rates and Maximum Automobile Fair Market Values Have Been Updated for 2026 A contractor with 20,000 business miles claims $14,500 without collecting a single fuel receipt.
The timing rule matters. You must pick the standard mileage rate in the first year you place the vehicle in business service. Start with actual expenses and you lose the option to switch to the standard rate for that vehicle later. Going the other direction is allowed: begin with the standard rate and you can move to actual expenses in a later year.
The Actual Expense Method
The actual expense method totals everything you spend to operate the vehicle: fuel, oil changes, tires, repairs, insurance, registration, and depreciation. You multiply the total by your business-use percentage.4Internal Revenue Service. Topic No. 510, Business Use of Car This method often produces a larger deduction for heavy trucks, vans, and other vehicles with high fuel or repair costs, where real spending outruns the flat per-mile figure.
The cost is recordkeeping. You save every receipt and track total miles for all purposes, not just business trips. For a delivery van with steep fuel and repair bills, the extra work can be worth thousands over the standard rate.
Recordkeeping the IRS Will Accept
The IRS does not take your word for business mileage. You need a contemporaneous log, meaning one kept at or near the time of each trip rather than reconstructed in April. Each entry should record:
- The date of the trip
- Odometer readings at the start and end, or total miles driven
- The destination
- The business purpose
If you use the actual expense method, add fuel receipts, repair invoices, and insurance statements. Keep a running tally of total miles for all uses so your business-use percentage is defensible. The vehicle’s purchase date and price feed into depreciation, so keep those too.
Hold these records at least three years after filing.5Internal Revenue Service. Topic No. 305, Recordkeeping Where income is substantially understated, the IRS can look back six years, so a longer hold is prudent. Losing a deduction is not the only risk. If the IRS finds negligent recordkeeping caused an underpayment, an accuracy-related penalty of 20% applies on top of the tax owed.
Where the Deduction Goes on Your Return
Self-employed filers report vehicle expenses on Schedule C (Form 1040), Line 9 for car and truck expenses.6Internal Revenue Service. Instructions for Schedule C (Form 1040) The vehicle information section on Schedule C also asks for total miles, business miles, and whether you have written documentation. Farmers use Schedule F instead.
If you chose the standard mileage rate, the math is business miles times 72.5 cents. If you used actual expenses, enter the business-use portion of your total operating costs. Either way, the deduction lowers your net profit on Schedule C, which reduces both income tax and self-employment tax. The self-employment piece is easy to forget: because that tax runs on net earnings, each deductible dollar of fuel saves roughly 15.3 cents in self-employment tax on top of your income tax savings.
The Off-Highway Fuel Tax Credit
If your business burns fuel in equipment that never uses public roads, a federal credit refunds the excise tax built into the pump price. Federal excise tax runs 18.3 cents per gallon on gasoline and 24.3 cents per gallon on diesel.7U.S. Energy Information Administration. How Much Tax Do We Pay on a Gallon of Gasoline and on a Gallon of Diesel Fuel Those taxes pay for highways, so fuel that never touches one is eligible for a refund.
The credit covers fuel used in farming equipment, construction machinery, stationary engines, commercial fishing boats, and similar off-highway applications. Buy undyed fuel (which already includes the excise tax at purchase), then claim the credit on Form 4136.8Internal Revenue Service. Fuel Tax Credit A credit reduces your tax bill dollar for dollar rather than just lowering taxable income. A farm burning 5,000 gallons of diesel off-highway recovers about $1,215 directly against its tax liability.
Dyed diesel is the tax-exempt alternative meant only for off-highway use. Running it in any vehicle registered for highway use triggers a penalty of $1,000 or $10 per gallon, whichever is greater, plus the excise tax you avoided.9Internal Revenue Service. Publication 4941, Penalty Guidance for Dyed Fuel Mixing even a small amount of dyed fuel with undyed fuel exposes the whole tank to penalties. Inspectors can check your tank at any time, and refusing carries a separate $1,000 fine per refusal. States can add penalties of their own.
Electric Vehicle Charging
Electricity used to charge a business vehicle is deductible as a fuel expense on the same business-use percentage as gasoline or diesel. Charge at home with 70% business use, and 70% of your charging costs are deductible. The hard part is separating charging electricity from household electricity, which is where a dedicated meter or a smart charger that logs energy usage earns its keep.
The 2026 standard mileage rate of 72.5 cents per mile applies to electric vehicles the same way it applies to gas-powered ones.1Internal Revenue Service. The Standard Mileage Rates and Maximum Automobile Fair Market Values Have Been Updated for 2026 Because electricity costs less per mile than gasoline, EV drivers who use the standard rate often deduct more than actual expenses would allow. Run both calculations before you commit in year one.
Reimbursing Employees for Fuel
If your business pays employees back for fuel, the structure of the reimbursement decides whether it counts as a tax-free benefit or taxable wages. Under an accountable plan, reimbursements are excluded from the employee’s income and deductible by the business. Three requirements apply: the expense has a business connection, the employee substantiates costs with receipts within a reasonable period (typically 60 days), and any excess reimbursement is returned within about 120 days.
Miss any of those tests and the IRS treats the whole reimbursement as taxable compensation. The business then owes payroll taxes on it and the employee owes income tax. Set the documentation process up correctly at the start rather than fixing it after a payroll audit.