Yes, a car used in your business is a fixed asset. Its cost goes on your balance sheet and gets written off gradually through depreciation rather than deducted all at once, provided the vehicle is used to produce income and has a useful life longer than one year.1Internal Revenue Service. Publication 946 – How To Depreciate Property Most business vehicles clear both tests easily. Only the business-use portion counts, though. If you drive a car 75% for work and 25% for personal errands, you capitalize 75% of the total cost; the rest is personal with no tax benefit.2Internal Revenue Service. Topic No. 510, Business Use of Car
What Goes Into the Cost Basis
The cost basis is the starting number for everything that follows. It’s the total amount you can eventually recover through depreciation, and it’s more than the sticker price.
Include the negotiated purchase price, sales tax, dealer preparation or delivery fees, and any non-refundable title or registration charges paid at purchase. Permanent modifications that adapt the vehicle for business also get added: a contractor’s ladder rack, a delivery company’s shelving units. Routine operating costs like insurance, fuel, and regular maintenance never go into the basis. Those are current-year expenses.
Depreciate the Car or Take the Standard Mileage Rate?
Before you build a depreciation schedule, decide how you’ll deduct vehicle costs. This choice has lasting consequences, and the deadline is the first year you place the vehicle in service for business.
The standard mileage rate for 2026 is 72.5 cents per mile of business driving, of which 26 cents is treated as depreciation. You multiply business miles by the rate. You don’t separately depreciate the vehicle or claim actual operating costs.
The actual expense method is where fixed-asset accounting comes in. You capitalize the vehicle, depreciate it, and deduct actual operating costs proportional to business use. Section 179 expensing and bonus depreciation are available only under this method.
The catch: if you want the standard mileage rate at all, you must choose it in the first year the vehicle is available for business use. You can switch to actual expenses later, but you cannot switch back to standard mileage on a vehicle you own. For leased vehicles, the year-one choice applies for the entire lease.2Internal Revenue Service. Topic No. 510, Business Use of Car
How Depreciation Works Under MACRS
The IRS requires most business vehicles to be depreciated under the Modified Accelerated Cost Recovery System (MACRS). Passenger vehicles fall into the five-year property class.1Internal Revenue Service. Publication 946 – How To Depreciate Property
Despite the “five-year” label, deductions actually spread across six tax years because of the half-year convention. Any vehicle placed in service during the year is treated as if placed in service at the midpoint, so year one and the last year each get only half a year’s depreciation.1Internal Revenue Service. Publication 946 – How To Depreciate Property
The default MACRS method for vehicles is 200% declining balance, which front-loads deductions into the earlier years and switches to straight-line when that produces a larger deduction. Your biggest write-offs come when the vehicle is newest. For mixed-use vehicles, every annual deduction is multiplied by the business-use percentage before you claim it.
First-Year Deductions: Section 179 and Bonus Depreciation
Two provisions let you recover a vehicle’s cost faster than standard MACRS, sometimes entirely in year one. Both require the vehicle to be used more than 50% for business in the year it’s placed in service.
Section 179 lets you expense qualifying business property in the year you buy it rather than depreciating it over time.3Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
Bonus depreciation provides an additional first-year deduction on top of, or instead of, Section 179. Under the One Big Beautiful Bill Act signed in 2025, bonus depreciation was restored to 100% on a permanent basis for qualifying property acquired after January 19, 2025.4Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill Bonus depreciation applies automatically unless you elect out of it for the entire property class. When both provisions are claimed on the same vehicle, Section 179 is applied first, then bonus depreciation on the remaining basis, then regular MACRS on whatever is left.
The Luxury Auto Caps That Override Everything Else
Here’s where the math gets real. Regardless of what Section 179 or bonus depreciation would otherwise allow, the IRS caps annual depreciation for passenger automobiles. These caps apply to any four-wheeled vehicle rated at 6,000 pounds gross vehicle weight or less that’s made primarily for use on public roads.5Legal Information Institute. 26 USC 280F(d)(5) – Definition of Passenger Automobile
For passenger automobiles placed in service in 2026 with bonus depreciation, the caps are $20,300 in year one, $19,800 in year two, $11,900 in year three, and $7,160 each year after.6Internal Revenue Service. Rev. Proc. 2026-15 – Limitations on Depreciation Deductions for Passenger Automobiles
When bonus depreciation does not apply (you elected out, the vehicle was acquired before September 28, 2017, or business use is 50% or less), the year-one cap drops to $12,300. Years two through remaining use the same figures as above.6Internal Revenue Service. Rev. Proc. 2026-15 – Limitations on Depreciation Deductions for Passenger Automobiles
These caps assume 100% business use. Lower usage shrinks them proportionally: a car used 80% for business can claim at most $16,240 in year one when bonus depreciation applies.
In practice, the luxury caps mean a $50,000 sedan takes many years to fully depreciate. That $7,160 annual ceiling keeps running until the full depreciable basis is recovered, which extends well beyond the standard five-year recovery period.
Heavy Vehicles Are a Different Story
Vehicles rated above 6,000 pounds gross vehicle weight are not passenger automobiles under the tax code, so the luxury caps do not apply. A full-size pickup or cargo van over 6,000 pounds can take the full Section 179 deduction and 100% bonus depreciation, potentially writing off the entire purchase price in year one. For SUVs between 6,000 and 14,000 pounds, Congress imposed a separate Section 179 cap of $32,000, but bonus depreciation can still cover the rest with no additional ceiling.3Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
That’s why the 6,000-pound threshold gets so much attention in tax planning. A heavy SUV can be fully deducted in year one, while a lighter sedan costing the same takes a decade or more to write off.
If Business Use Drops Below 50%
The more-than-50% business use requirement isn’t a one-time test. If business use falls to 50% or less in any year during the recovery period, two things happen. You must switch from accelerated MACRS to straight-line for the remaining recovery period. And you must recapture the excess depreciation you claimed in prior years, which is the difference between what you actually deducted (including any Section 179 or bonus depreciation) and what you would have deducted under straight-line. That recapture is reported as ordinary income on Form 4797.7Internal Revenue Service. Instructions for Form 4797
This is one of the most overlooked traps in vehicle accounting. Take a big first-year deduction, then start using the car mostly for personal driving a couple years later, and you’ll owe tax on the excess deductions plus lose accelerated depreciation going forward.
What Happens When You Sell the Vehicle
When you sell, trade in, or retire a business vehicle, the asset comes off your balance sheet and you recognize gain or loss. Start with the adjusted basis: original cost basis minus all depreciation claimed. Subtract that from what you receive. Proceeds above adjusted basis are gain; below are loss. The transaction goes on Form 4797.8Internal Revenue Service. About Form 4797, Sales of Business Property
A vehicle is Section 1245 property, so any gain up to the total depreciation you claimed is taxed as ordinary income, not at capital gains rates. The recapture amount equals the lesser of the depreciation taken or the gain realized.9Internal Revenue Service. Publication 544 – Sales and Other Dispositions of Assets The IRS treats this as clawing back the benefit of deductions you took at ordinary rates.
One boundary worth naming: like-kind exchange treatment no longer applies to vehicles. The Tax Cuts and Jobs Act limited Section 1031 to real estate starting January 1, 2018.10Internal Revenue Service. Like-Kind Exchanges – Real Estate Tax Tips A dealer trade-in is now a taxable sale: recognize gain or loss on the old vehicle, establish a new basis on the replacement.
Records You Have to Keep
The IRS puts the burden on you to prove both business-use percentage and the costs in the vehicle’s basis. Inadequate records can result in complete disallowance of vehicle deductions, not just a partial reduction.
A contemporaneous mileage log is the single most important document. “Contemporaneous” means recorded at or near the time of each trip. A weekly log is acceptable; reconstructing months of driving from memory at tax time is not. Each entry should show date, destination, business purpose, and miles driven, and you need odometer readings at the start and end of each tax year.
Keep the purchase contract, sales invoices, and receipts for every capitalized cost, including sales tax, title fees, and permanent modifications. These substantiate the basis on your balance sheet.
Retention runs longer than most people expect. The standard three-year rule covers ordinary income and expense documentation, but records for depreciable property must be kept until the statute of limitations expires for the year you dispose of the vehicle.11Internal Revenue Service. How Long Should I Keep Records Since you need the same documents to calculate depreciation every year and to figure gain or loss at sale, that often means holding purchase records for a decade or more.