Is gas tax deductible?
Only if you deduct your car’s actual costs. If you use the standard mileage rate, gas is already inside the rate and can’t be deducted again.
The rule
Most self-employed people use the standard mileage rate, and it already counts fuel. For them the answer is no: log the miles instead, and the gas receipts don’t matter.
On the actual-expense method, gas is deductible by the car’s business share: business miles over total miles for the year. So is oil, repairs, tires, insurance, registration and depreciation, by the same share.
Fuel for a vehicle or machine used only for the business, like a work van or a generator on a job site, is deductible in full.
On the actual method, a $62 fill-up for a car driven 40% for work puts $24.80 on the return.
Priced at 36¢ on the dollar, the rate of a $95,000 sole proprietor in California. Work out yours.
- Where it goes
- Schedule C line 9, car and truck expenses
- What to keep
- Fuel receipts, and the mileage log that gives you the business share.
Checked on September 25, 2026 against Publication 463, Travel, Gift and Car Expenses. An estimate for your records, not tax advice.
By the kind of work
What else each of these can deduct, and what they tend to miss.
See it on every receipt.
Snap it and Reimburse files it on the right Schedule C line, takes the deductible share and shows what it puts back.