How to Write Off a Car as a Business Expense: Methods and Records

To write off a car as a business expense, you pick one of two methods the IRS allows: the standard mileage rate, where you multiply your business miles by a set per-mile figure, or the actual expense method, where you deduct the business-use share of every real cost, including depreciation. Either way, the deduction is only available if you use the car in a trade or business, and it is limited by the percentage of your total driving that is actually for business. The rest of this article walks through who qualifies, how to choose a method, how depreciation works if you buy the vehicle, what happens when you sell it, and the records you need to keep.

Who Can Take a Vehicle Deduction

This deduction is for self-employed people and business owners. If you file a Schedule C, receive income from a partnership, or own an S-corp, you can claim vehicle expenses through one of the methods below.

W-2 employees cannot. The Tax Cuts and Jobs Act suspended the deduction for unreimbursed employee expenses in 2018, and the One Big Beautiful Bill Act made that suspension permanent. Even if your employer never reimburses you for driving, you cannot deduct it on your personal return. The only workaround is an employer-sponsored accountable plan, under which the company reimburses documented business mileage; those reimbursements are tax-free and do not appear on your W-2.¹

Your Business-Use Percentage Controls Everything

Every vehicle deduction starts with one number. Divide your business miles for the year by your total miles driven. Put 18,000 miles on the car with 12,000 for business, and your business-use percentage is 67%. That percentage caps how much of any expense — mileage-rate deduction, fuel, insurance, depreciation — you can actually claim.

Not every trip qualifies. Driving from home to your regular workplace is commuting, which is personal no matter the distance. Business mileage covers trips to clients, travel between work locations, supply runs, and any other driving with a direct business purpose.²

A vehicle used 100% for business, like a delivery van that never runs personal errands, skips this math. For everyone else, a verifiable percentage backed by a mileage log is what keeps the deduction from being disallowed at audit.

The Standard Mileage Rate Method

The simpler method is the standard mileage rate. Multiply your documented business miles by the IRS-published rate. For 2025, that rate is 70 cents per mile.³ The IRS usually announces the next year’s rate in December, so check for the 2026 figure at irs.gov before filing.

The per-mile rate is meant to cover depreciation, gas, oil, insurance, and maintenance in one number. You cannot deduct those costs separately on top of it. The only extras you can add are parking fees and tolls tied to business trips, which are fully deductible.⁴

Timing matters. If you own the vehicle, you have to choose the standard mileage rate in the first year the car is available for business use. You can switch to actual expenses later, though depreciation from that point on has to use the straight-line method. If you lease, the choice is stricter: once you pick the standard mileage rate, you are locked into it for the entire lease, renewals included.²

One more limit: the standard rate is off the table if you operate five or more vehicles at the same time, as in a fleet.²

The Actual Expense Method

The actual expense method takes more bookkeeping but often produces a bigger deduction, especially for expensive vehicles or those with high operating costs. Track every dollar spent on the vehicle, total it, and multiply by your business-use percentage.

Eligible operating costs include gas, oil changes, tires, repairs, insurance, registration, and car washes. If you financed the vehicle, the business-use portion of your loan interest is also deductible on Schedule C.⁵ Repairs and short-lived items like batteries come off in the year you pay for them. Parking and tolls for business trips are 100% deductible and are not reduced by your business-use percentage, because they are incurred entirely for business.⁴

If you lease, your lease payments count as an operating expense. When the vehicle’s fair market value at lease start exceeds an IRS threshold — $62,000 for leases beginning in 2026 — you have to reduce your deduction by a “lease inclusion amount” pulled from IRS tables, prorated for the days you used the vehicle and multiplied by your business-use percentage.⁶ The effect roughly mirrors the depreciation caps that apply to purchased vehicles.

Depreciation on a Vehicle You Buy

If you buy a vehicle and use the actual expense method, depreciation is where the biggest deductions live. Depreciation recovers the purchase price over time, and accelerated methods can pull most of that recovery into year one. Vehicles are five-year property under MACRS.⁷

Passenger Vehicle Caps

The IRS puts annual dollar limits on depreciation for passenger automobiles, defined as four-wheeled vehicles built primarily for public roads with a gross vehicle weight rating (GVWR) of 6,000 pounds or less. The caps apply regardless of price, so a $30,000 sedan hits the same ceiling as a $60,000 one.

For a passenger vehicle placed in service in 2026 with bonus depreciation, the first-year cap is $20,300. Without bonus depreciation, that first-year cap drops to $12,300.⁶ These figures assume 100% business use; if your business use is 75%, you multiply the cap by 0.75.

Section 179 and Bonus Depreciation

Two accelerated tools let you front-load your deduction instead of stretching it across five years. Both require more than 50% business use. If business use drops to 50% or below during the recovery period, you owe recapture tax on the excess depreciation.

Section 179 lets you expense the cost of qualifying property in the year you place it in service. The overall Section 179 limit for 2026 is $2,560,000, but for passenger vehicles under 6,000 pounds GVWR the passenger-vehicle caps override that number. Section 179 alone cannot push a light passenger car’s first-year deduction beyond $20,300. You make the election on Form 4562.⁸

Bonus depreciation applies to whatever cost remains after Section 179. Under the One Big Beautiful Bill Act, 100% bonus depreciation is available for qualifying property acquired after January 19, 2025, and placed in service through the end of 2028.⁹ For a passenger car, that means you reach the $20,300 first-year cap faster, but you cannot get past it. A narrow exception: vehicles acquired before January 20, 2025, and placed in service in 2026 qualify for only 20% bonus depreciation.

Heavy Vehicles Escape the Passenger Caps

Vehicles with a GVWR over 6,000 pounds but not more than 14,000 pounds are exempt from the passenger vehicle caps. That covers many full-size SUVs, pickups, and cargo vans.

For these heavier vehicles, Section 179 has its own limit. In 2025 that cap was $31,300.⁴ The IRS adjusts it annually for inflation; for 2026, the limit is approximately $32,000. Pickups with a bed at least six feet long escape that SUV-specific cap and can use the full Section 179 limit.

After Section 179, 100% bonus depreciation applies to what is left for vehicles acquired after January 19, 2025. Combined, the two provisions can produce a near-complete write-off in year one. On a $70,000 SUV used entirely for business, you could potentially deduct the full purchase price the year you place it in service. The math scales with your business-use percentage, and it comes with a recapture bill later if you sell.

What Happens When You Sell the Vehicle

Every dollar of depreciation you claim reduces the vehicle’s tax basis. When you eventually sell, trade in, or otherwise dispose of it, that lower basis creates a larger taxable gain. This is depreciation recapture, and it surprises a lot of business owners.

Business vehicles are Section 1245 property. When you sell one at a gain, the part of that gain equal to the depreciation you previously claimed is taxed as ordinary income rather than at the lower capital gains rate. The recapture is the lesser of your total depreciation or your realized gain. Any gain beyond the recaptured depreciation becomes a Section 1231 gain, which may qualify for long-term capital gains treatment. You report the calculation on Form 4797.¹⁰

Aggressive first-year write-offs under Section 179 and bonus depreciation amplify this effect. Deduct $60,000 on a heavy SUV in year one, sell it three years later for $30,000, and effectively the entire sale price is ordinary income. The big deduction is a timing benefit, not free money. Worth remembering before you take the largest possible write-off on a vehicle you plan to replace in a few years.

Records the IRS Will Ask For

Vehicle deductions get disallowed in audits for one reason more than any other: incomplete records. The burden of proof is on you, and the records need to be contemporaneous, meaning logged at or near the time of each trip rather than reconstructed at year-end.

Mileage Log

A compliant mileage log records five things for every business trip: the date, the starting point, the destination, the business purpose, and the miles driven. You also need odometer readings at the beginning and end of each tax year so you can calculate your business-use percentage. GPS-based mileage apps that log trips automatically tend to hold up better than handwritten logs, though both are acceptable.

Receipts for Actual Expenses

Under the actual expense method, keep receipts or records for every operating cost: repairs, oil changes, insurance, registration, and fuel. Card and bank statements can back up the log, but itemized receipts are the strongest evidence for individual expenses. A dedicated business credit card for vehicle costs makes this much cleaner.

How Long To Keep Everything

The general rule is to keep records supporting any deduction for at least three years from the date you filed the return.¹¹ For a depreciated vehicle, the smarter practice is to hold everything for three years after you fully depreciate or dispose of the vehicle, whichever comes later. If the IRS questions your depreciation in a later year, you need the original purchase records and every year’s mileage log to support the deduction chain from day one.

1
eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
2
Internal Revenue Service. Topic No. 510, Business Use of Car
3
Internal Revenue Service. Standard Mileage Rates
4
Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
5
Internal Revenue Service. Instructions for Schedule C (Form 1040)
6
Internal Revenue Service. Rev. Proc. 2026-15
7
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
8
Internal Revenue Service. About Form 4562, Depreciation and Amortization
9
Internal Revenue Service. One, Big, Beautiful Bill Provisions
10
Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets
11
Internal Revenue Service. How Long Should I Keep Records?