Vehicle Tax Deduction Calculator

Vehicle tax deductions allow self-employed individuals and business owners to deduct the business-use portion of vehicle expenses from taxable income, reducing total tax owed.

Two IRS-approved methods, and you may pick whichever gives the bigger number:

Method 1, the standard mileage rate: Deduction = Business Miles × IRS Standard Rate

The rate was 67 cents for 2024 and 70 cents for 2025. A fresh figure is announced each December, which is why the rate is a box above rather than a number frozen into this page. Look up the year you are filing for.

Method 2, actual expenses: Deduction = Total Vehicle Expenses × Business Use % Business Use % = Business Miles ÷ Total Miles × 100

Count fuel, insurance, registration, repairs, tyres, lease payments and depreciation, or a Section 179 write-off if you own the vehicle outright.

Worked example, both methods on the same year: 18,000 total miles, of which 11,000 were business, so 61.1% business use. Actual costs of $9,200: fuel $2,400, insurance $1,800, repairs $800, depreciation $4,200.

• Standard mileage at 70 cents: 11,000 × $0.70 = $7,700
• Actual expenses: $9,200 × 61.1% = $5,622

The standard rate wins by $2,078 here, and it usually does for an ordinary car driven a lot. Depreciation is what flips it: put an $80,000 vehicle in the same place and the actual method can double the deduction.

When actual expenses win:

• An expensive vehicle, where depreciation alone dwarfs the mileage rate
• Heavy insurance or repair bills
• Few miles but high fixed costs

The choice is stickier than it looks. You may switch from standard to actual on a vehicle you own, but not back again, and you cannot use the standard rate at all on a vehicle you have already depreciated under MACRS or Section 179. Leased vehicles are worse: whichever method you pick in year one is locked in for the whole lease. Start with the standard rate unless you are certain, because it keeps your options open.

Commuting is not business use. Home to your regular workplace is personal mileage however far it is, and it belongs in the total-miles figure, not the business one. Overstating business use is the fastest way to lose an audit on this deduction.

Records: date, destination, purpose and miles for every trip, kept as you go. A log reconstructed the week before an audit is what gets thrown out.