If you buy a car for your business, you can write off both what it costs to operate and the purchase price itself, but the size of the first-year deduction turns on the vehicle’s weight and how much you actually drive it for work. For a passenger car placed in service in 2026 with 100% bonus depreciation, the maximum first-year write-off is $20,300. Heavier vehicles rated over 6,000 pounds escape those caps and can produce a first-year deduction of roughly $32,000 or more, and in some cases the full purchase price. The rules around method selection, business-use percentage, and later recapture are strict, and a wrong choice in year one can follow the vehicle for the rest of its useful life.
Who Can Write Off a Business Vehicle
Self-employed individuals, sole proprietors, partnerships, S corporations, and C corporations can all deduct business vehicle costs. If you file a Schedule C, receive a partnership K-1, or run a corporate entity, the deduction methods below are available to you.
W-2 employees are generally shut out. The suspension of unreimbursed employee expense deductions from the Tax Cuts and Jobs Act is now permanent.1Internal Revenue Service. 2026 Standard Mileage Rates Notice 2026-10 A few narrow categories still qualify: Armed Forces reservists, fee-basis state and local government officials, certain performing artists, and eligible educators can deduct qualifying vehicle costs as an adjustment to income. Outside those categories, if your employer does not reimburse you, federal law offers no vehicle deduction.
The 50% Business Use Threshold
Before any of the accelerated write-offs are on the table, the vehicle has to be used more than 50% for business during the tax year. That is the gatekeeper for Section 179 and bonus depreciation.2Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Depreciation Deduction You calculate the percentage by dividing business miles by total miles. At 50% or below, you drop to straight-line depreciation over five years and lose every accelerated option.
Commuting doesn’t count. Miles between your home and your regular workplace are personal, even if you take business calls on the drive.3Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Transportation Only trips between business locations, to client sites, or to temporary work locations qualify.
Two Ways to Deduct: Mileage Rate or Actual Expenses
Two methods exist, and the choice you make in year one carries consequences.
Standard Mileage Rate
The standard mileage rate is a flat per-mile amount that replaces most individual expense tracking. For 2026 the IRS set it at 72.5 cents per mile.4Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents The rate covers fuel, insurance, depreciation, and maintenance. Business parking fees and tolls are deductible on top.3Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Transportation
The catch is the year-one lock. You have to elect the standard mileage rate in the first year the vehicle is used for business, or you can never use it for that vehicle.5Internal Revenue Service. Topic No. 510, Business Use of Car Starting with the standard rate leaves the door open to switch to actual expenses later, but you’re then limited to straight-line depreciation. Starting with actual expenses and claiming MACRS, Section 179, or bonus depreciation in year one closes the standard-mileage door permanently for that car.
Actual Expense Method
The actual expense method deducts every dollar spent to operate the vehicle, multiplied by the business-use percentage. That includes fuel, oil changes, tires, repairs, insurance, registration, and garage rent. For self-employed taxpayers, interest on the car loan is deductible here too.
This method takes more paperwork, but it usually produces a bigger deduction, because the actual expense method covers only operating costs. The purchase price itself is recovered separately through depreciation, and that is where the largest write-offs live.
How the First-Year Write-Off Is Built
When you buy a business vehicle, three depreciation tools stack together in the first year: Section 179 expensing, bonus depreciation, and standard MACRS. You report all of them on Form 4562 attached to your return.6Internal Revenue Service. 2025 Instructions for Form 4562
Section 179 Expensing
Section 179 lets you deduct the cost of a qualifying asset in the year you place it in service, rather than spreading it over five years. For 2026 the general cap is $2,560,000.7Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets Vehicles have their own, much lower limits that override that ceiling, and those depend on weight.
Section 179 also cannot exceed your total taxable income from active businesses. It can’t create or deepen a loss. Anything unused carries forward.8eCFR. 26 CFR 1.179-2 – Limitations on Amount Subject to Section 179
Bonus Depreciation
Bonus depreciation is an additional first-year deduction, taken on top of or instead of regular MACRS. The One, Big, Beautiful Bill Act restored 100% bonus depreciation for qualified property acquired after January 19, 2025, so a vehicle placed in service in 2026 is eligible for the full amount.9Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill New and used both qualify, as long as the vehicle is new to you. Unlike Section 179, bonus depreciation has no taxable-income limit and can create a net operating loss.
Standard MACRS
If you don’t elect Section 179 or bonus depreciation, MACRS is the default. Business vehicles are five-year property, spread over six calendar years using a declining-balance method that front-loads the deduction.10Internal Revenue Service. Publication 946 (2025), How To Depreciate Property MACRS is also the fallback if business use drops to 50% or below, though at that point you must use straight-line instead of the accelerated schedule.11Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Car Used 50 Percent or Less for Business
Passenger Cars vs. Heavy Vehicles
This is where the numbers actually land, and where the popular “SUV tax break” comes from.
Passenger Vehicles (6,000 Pounds or Less)
Any four-wheeled vehicle built for public roads and rated at 6,000 pounds unloaded gross weight or less is a “passenger automobile” under the tax code. Trucks and vans are measured by gross vehicle weight instead.12Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles These vehicles face hard annual dollar caps on depreciation no matter what the car cost or which method you combine.
For a passenger vehicle placed in service in 2026 with bonus depreciation, the first-year cap is $20,300.13Internal Revenue Service. Rev. Proc. 2026-15 Depreciation Limitations for Passenger Automobiles Placed in Service During Calendar Year 2026 Without bonus depreciation, the first-year limit drops to $12,300. A $50,000 sedan will take several years to fully depreciate, even with the most aggressive combination of deductions.
Heavy Vehicles (Over 6,000 Pounds)
Vehicles with a gross vehicle weight rating above 6,000 pounds sit outside the passenger automobile definition and escape those annual caps entirely. Many full-size SUVs, pickup trucks, cargo vans, and commercial vehicles clear that line.
For heavy SUVs and trucks rated between 6,000 and 14,000 pounds, Section 179 is capped at approximately $32,000 for 2026. After that cap is applied, the remainder qualifies for 100% bonus depreciation.9Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill The combination can let you deduct the entire purchase price of an $80,000 truck in year one, assuming 100% business use.
Vehicles over 14,000 pounds face no special vehicle cap on Section 179. A $120,000 box truck used entirely for business can be fully expensed in year one, limited only by the general $2,560,000 ceiling and the taxable-income rule.
Financed and Leased Vehicles
Financing does not reduce your depreciation. Section 179 and bonus depreciation apply to the full purchase price, not the down payment. A business owner who puts $5,000 down and finances $45,000 still depreciates the full $50,000 (subject to the applicable caps). Loan interest is a separate deductible operating expense under the actual expense method.
Leasing works differently. You deduct the business-use portion of each lease payment, but Section 179 and bonus depreciation are unavailable because you don’t own the vehicle. For expensive leased vehicles, the IRS requires a “lease inclusion amount” that reduces the deduction, preventing lessees from stepping around the passenger vehicle depreciation caps.13Internal Revenue Service. Rev. Proc. 2026-15 Depreciation Limitations for Passenger Automobiles Placed in Service During Calendar Year 2026 The amount varies by the vehicle’s fair market value and lease term, and the IRS publishes updated tables each year.
What Can Claw the Write-Off Back Later
Aggressive first-year depreciation has a tail. If you sell the vehicle for more than its depreciated value, the IRS recaptures part of that benefit. The gain attributable to prior depreciation is taxed as ordinary income rather than at capital gains rates. Recapture equals the lesser of the total depreciation claimed (including Section 179 and bonus) or the gain realized on the sale.14Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets People who took a large first-year write-off are often caught off guard at trade-in time.
A similar issue arises if business use drops to 50% or below during the MACRS recovery period. You have to recalculate depreciation for all prior years as if you had used straight-line from the beginning, and the difference is added back to income as ordinary income in the year the use dropped.11Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Car Used 50 Percent or Less for Business From that point on, straight-line is your only option for that vehicle, even if business use climbs back above 50%.
Records You Need to Keep
Every deduction method requires a contemporaneous mileage log. The IRS expects the date of each trip, starting and ending locations, business purpose, and odometer readings.15Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses Contemporaneous means at or near the time of the trip, not reconstructed at year-end. A smartphone mileage app handles this reliably.
Under the actual expense method, you also need receipts for every operating cost: fuel, repairs, insurance, registration, and loan interest. The business-use percentage from your mileage log is then applied to the totals. Inadequate records during an audit means the deduction is disallowed entirely, with penalties on top of the tax owed. The recordkeeping is the price of the bigger write-off.