To write off a car for business, you deduct your vehicle costs one of two ways: the IRS standard mileage rate, set at 72.5 cents per business mile for 2026, or the actual expense method, which lets you deduct a business-use share of fuel, insurance, repairs, lease payments, loan interest, and depreciation. Which one saves more depends on what you drive, how expensive it is to operate, and how much of your driving is genuinely for work.
Who Can Take the Deduction
Self-employed people, sole proprietors, and partners have the broadest access to a vehicle write-off. If you file a Schedule C or report business income through a partnership, the miles you drive for that business are deductible.
W-2 employees are the boundary case. If your employer doesn’t reimburse your driving, you cannot deduct those unreimbursed vehicle expenses on your federal return. The Tax Cuts and Jobs Act suspended the deduction starting in 2018, and a 2025 amendment made the suspension permanent.1Office of the Law Revision Counsel. 26 U.S. Code 67 – 2-Percent Floor on Miscellaneous Itemized Deductions Some states still allow it on the state return, but the federal write-off is gone for employees.
Even for the self-employed, only business miles count. Driving from home to your regular workplace is a personal commute and not deductible. Business use covers trips between job sites, visits to clients, supply runs, and travel to meetings held somewhere other than your primary workplace.2Internal Revenue Service. Topic No. 510, Business Use of Car
The Standard Mileage Rate
The standard mileage rate is the simpler method. For 2026, the IRS set it at 72.5 cents per business mile.3Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents Multiply your business miles by the rate and that’s your deduction. Drive 15,000 business miles and you write off $10,875. The rate already covers fuel, insurance, maintenance, and a depreciation component of 35 cents per mile baked into the calculation.4Internal Revenue Service. Notice 2026-10 – Standard Mileage Rates
One rule matters more than any other here. You have to choose the standard mileage rate in the first year you use a vehicle for business. After that year, you can switch to actual expenses. The reverse doesn’t always work. If you ever claim Section 179 expensing, bonus depreciation, or any accelerated depreciation on a vehicle, you can never use the standard mileage rate for that vehicle again.2Internal Revenue Service. Topic No. 510, Business Use of Car That first-year decision is close to irreversible, so treat it that way.
The standard rate tends to favor drivers of modest, fuel-efficient cars with high business mileage. Less paperwork, and often a bigger number than actual expenses would produce.
The Actual Expense Method
Under the actual expense method, you total every cost of running the vehicle for the year — fuel, oil changes, tires, repairs, insurance, registration, lease payments, loan interest, and depreciation — then multiply by your business-use percentage.
The percentage is simple arithmetic. Divide business miles by total miles driven. If you drove 20,000 miles and 12,000 were for business, your business-use percentage is 60%, and you deduct 60% of every qualifying expense. That single figure drives everything, including how much depreciation you can claim, so a vehicle used 90% for work generates a far larger deduction than one used 55%.
Actual expenses generally win when the vehicle is expensive to operate or your business-use percentage is high. The record-keeping is heavier, but the depreciation rules below are where the real money is.
Section 179 and 100% Bonus Depreciation
Depreciation is often the biggest line item in an actual-expense write-off. Two provisions let you take most or all of it in year one instead of spreading it over five to seven years.
Section 179
Section 179 lets you deduct the full purchase price of a business vehicle in the year you place it in service, up to a limit. The overall 2026 cap is $2,560,000, far above any vehicle cost, so the real ceiling depends on what you bought. SUVs and certain trucks rated between 6,000 and 14,000 pounds gross vehicle weight face a special cap of $31,300.5Internal Revenue Service. Instructions for Form 4562 Lighter passenger vehicles hit the luxury auto caps described in the next section. Vehicles rated above 14,000 pounds, like heavy work trucks, escape both.
You have to use the vehicle more than 50% for business in its first year. Drop below that threshold later and the IRS can recapture part of the deduction.
100% Bonus Depreciation
The One Big Beautiful Bill Act restored permanent 100% bonus depreciation for qualified property acquired after January 19, 2025.6Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill For a vehicle placed in service in 2026, first-year depreciation can equal 100% of the depreciable cost.7Internal Revenue Service. Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction
Stack the two on a heavy vehicle and the math gets aggressive. Take the $31,300 Section 179 deduction on an eligible SUV over 6,000 pounds GVWR, then apply 100% bonus depreciation to what’s left. A $65,000 SUV rated at 7,000 pounds and used entirely for business can be written off almost completely in year one. That’s the reason the “6,000-pound rule” gets so much airtime among small business owners buying trucks and large SUVs.
Why You Can’t Write Off a Regular Car All at Once
Passenger cars under 6,000 pounds GVWR run into an annual depreciation cap under Section 280F, often called the luxury auto limit even though it snags plenty of ordinary sedans. For vehicles placed in service in 2026, the caps are:8Internal Revenue Service. Rev. Proc. 2026-15 – Depreciation Limitations for Passenger Automobiles
- With bonus depreciation: $20,300 in year one, $19,800 in year two, $11,900 in year three, $7,160 each year after.
- Without bonus depreciation: $12,300 in year one, then the same $19,800, $11,900, and $7,160 in the years that follow.
Bonus depreciation adds $8,000 to year one; after that, the caps match. Even at 100% business use, a passenger car takes roughly five to seven years to fully depreciate. If your business-use percentage is below 100%, the caps shrink in proportion. The caps don’t apply to vehicles rated above 6,000 pounds GVWR that aren’t primarily designed to carry passengers, which is why work pickups and cargo vans can be written off far faster than a sedan of similar price.
Leasing a Business Car
If you lease, the actual expense method lets you deduct the business-use portion of each lease payment along with your other operating costs. You can pick the standard mileage rate for a leased car instead, but the choice is made in the first year of the lease and stays put for the entire lease term.2Internal Revenue Service. Topic No. 510, Business Use of Car
There’s an offset that surprises lessees. For leased passenger vehicles above a certain fair market value, the IRS requires you to add an “inclusion amount” to your income each year of the lease. It exists to keep leasing from becoming an end-run around the purchased-vehicle depreciation caps. For leases starting in 2026, the inclusion amount begins at a fair market value above $62,000 and rises with the vehicle’s value.9Internal Revenue Service. Rev. Proc. 2026-15 – Lease Inclusion Amounts for Passenger Automobiles The amounts are small early and grow over the life of the lease.
Records the IRS Expects
The IRS wants a contemporaneous mileage log, meaning entries made as trips happen rather than reconstructed in April. Each entry needs the date, starting point, destination, business purpose, and miles driven. You also need odometer readings at the start and end of the tax year to prove total miles and calculate your business-use percentage.
If you use the actual expense method, keep every receipt: gas, maintenance, insurance, registration, and anything else you’re deducting. Digital copies are fine as long as they’re legible and show both the amount and the business connection.
Hold on to these records at least three years after filing the return that claims the deduction.10Internal Revenue Service. How Long Should I Keep Records? Longer is smarter if you’re depreciating the vehicle over multiple years, because the IRS can still look back at basis and depreciation calculations while the vehicle remains in service. Weak records are where most vehicle deductions collapse. The IRS can disallow the deduction entirely if you can’t substantiate business miles, and an accuracy-related penalty of 20% of the underpayment may apply on top of the additional tax.11Office of the Law Revision Counsel. 26 U.S.C. 6662 – Imposition of Accuracy-Related Penalty on Underpayments
How to Report It on Your Return
Self-employed taxpayers report vehicle expenses on Schedule C (Form 1040). If you’re using the standard mileage rate and not claiming depreciation on any other asset, you can enter the vehicle information directly in Part IV of Schedule C without a separate depreciation form.12Internal Revenue Service. Instructions for Schedule C (Form 1040) – Line 9 If you’re claiming Section 179, bonus depreciation, or regular depreciation under the actual expense method, complete Part V of Form 4562 and attach it to your return.5Internal Revenue Service. Instructions for Form 4562
What Happens When You Sell the Vehicle
Every dollar of depreciation you claim eventually shows up again when you dispose of the vehicle. Under the recapture rules, any gain on the sale up to the total depreciation previously deducted is taxed as ordinary income rather than at the lower capital gains rate. Only gain beyond that total gets capital gains treatment.
An example makes it concrete. You buy a truck for $50,000, claim $35,000 in depreciation over the years you own it, and sell it for $25,000. Your adjusted basis is $15,000, so the gain is $10,000. Because that $10,000 falls inside the $35,000 of depreciation you claimed, all of it is ordinary income. Report the sale on Form 4797.
The trap for standard-mileage-rate users is the deemed depreciation baked into the rate — 35 cents per mile for 2026.4Internal Revenue Service. Notice 2026-10 – Standard Mileage Rates Those amounts accumulate year after year and reduce your basis in the vehicle even though you never chose to depreciate it explicitly. At sale, the recapture calculation uses that accumulated figure, and people who took the mileage rate for years are sometimes surprised to owe ordinary income tax.
Trading a business vehicle for a new one doesn’t erase the recapture. The gain from the trade-in reduces the basis of the replacement vehicle and shrinks your depreciation deductions on the new one. If a sale or trade-in is coming, run the recapture numbers before you sign anything.