A car payment is not a tax write-off on its own, but the two things buried inside that payment can be. If you use the vehicle for business, you can deduct depreciation on the car’s cost and the interest portion of your loan, both scaled to the percentage of your driving that’s for business.1Internal Revenue Service. Topic No. 510, Business Use of Car A separate new deduction, created by the One Big Beautiful Bill Act, lets some personal buyers deduct auto loan interest even without any business use. How much you actually save depends on how you use the car, which method you pick, and what you drive.
Why the Payment Itself Doesn’t Count
Each monthly payment is really two payments stitched together: principal, which pays down what you borrowed, and interest, which pays the lender for the loan. The IRS treats the principal portion as repaying a debt used to buy a capital asset, not as a business expense. Paying down the loan balance is a balance-sheet move, not a deductible cost.
The vehicle’s purchase price gets recovered a different way: through depreciation, spread across several tax years. The car sits on your books as an asset, and each year you claim part of its value as a deduction. The interest portion of the payment is separately deductible to the extent the car is used for business. So the payment stub is not the write-off. Depreciation and interest are.
Who Can Actually Deduct Anything
Self-employed people, sole proprietors, and business owners who drive for work can deduct vehicle expenses on Schedule C or their business return.2Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses Partners and members of an LLC taxed as a partnership can deduct unreimbursed vehicle expenses on their individual returns.
If you’re a W-2 employee, you can’t. The Tax Cuts and Jobs Act suspended the deduction for unreimbursed employee business expenses starting in 2018, with no current end date under existing law. Even if your employer requires you to use your own car and doesn’t reimburse you, those miles aren’t deductible on your federal return. The only path is getting reimbursed through an employer’s accountable plan.
What Counts as Business Use
Only business miles generate a deduction, and the most common mistake is assuming a daily commute qualifies. It doesn’t. Driving from home to your regular workplace is commuting, and commuting is never deductible.3Internal Revenue Service. Travel and Entertainment Expenses – Frequently Asked Questions
What does count: driving between two work locations during the day, visiting clients or customers, going to a business meeting away from your main office, and travel from home to a temporary work site expected to last a year or less.3Internal Revenue Service. Travel and Entertainment Expenses – Frequently Asked Questions
There is a meaningful exception for home-based workers. If your home office qualifies as your principal place of business, meaning you use it exclusively and regularly for managing your business and have no other fixed location for those tasks, then trips from home to a client site or secondary work location count as business mileage rather than commuting.4Internal Revenue Service. Publication 587, Business Use of Your Home For genuine home-office businesses, this rule can dramatically expand deductible mileage.
Two Ways to Claim the Business Portion
Once you know your business miles, you pick one of two methods.
Standard Mileage Rate
The simpler option is a flat per-mile deduction that bundles depreciation, gas, insurance, maintenance, and wear into one number. For 2026, the business rate is 72.5 cents per mile.5Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents Multiply business miles by the rate, and that’s your deduction. Parking fees, tolls, and the business-use share of your car loan interest are deductible on top of the per-mile amount.6Internal Revenue Service. Standard Mileage Rates
This method usually wins for people driving modest, fuel-efficient cars with low operating costs. For an expensive truck with high fuel and repair bills, actual expenses may produce a larger deduction.
Actual Expense Method
The actual expense method requires tracking every cost of operating the vehicle: fuel, oil changes, tires, repairs, insurance, registration.1Internal Revenue Service. Topic No. 510, Business Use of Car You multiply the total by your business-use percentage. Use the car 70% for business, deduct 70% of the costs.
The real draw of this method is depreciation. Instead of the modest depreciation baked into the standard rate, you claim depreciation reflecting the vehicle’s actual cost, and loan interest is fully deductible at your business-use percentage. For passenger cars and lighter SUVs (under 6,000 pounds gross vehicle weight), annual depreciation is capped under the so-called luxury auto rules, which apply to nearly every passenger car regardless of price.7Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
The First-Year Election Trap
To use the standard mileage rate at all, you have to choose it in the first year the vehicle is placed in service for business.6Internal Revenue Service. Standard Mileage Rates Start with mileage and you can switch to actual expenses later. Start with actual expenses and claim accelerated depreciation like Section 179 or bonus depreciation, and you’re locked out of the standard mileage rate for that vehicle for good. Run both calculations before you file the first return.
Heavy Vehicles and Big First-Year Write-Offs
Vehicles with a gross vehicle weight rating over 6,000 pounds but no more than 14,000 pounds escape the luxury auto depreciation caps.8Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets Most full-size pickups, large SUVs like the GMC Yukon and Chevrolet Tahoe, and commercial vans fall into this range. The GVWR is on the sticker inside the driver’s door jamb.
Section 179 lets you expense the qualifying cost immediately instead of depreciating it over years.8Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets Heavy SUVs designed primarily to carry passengers face a separate statutory cap on the Section 179 deduction, set at $25,000 and adjusted annually for inflation. Heavy pickups and cargo vans generally aren’t subject to that SUV-specific cap, so a qualifying work truck used 100% for business can potentially be fully expensed in year one.
The One Big Beautiful Bill Act restored permanent 100% bonus depreciation for qualifying property acquired after January 19, 2025.9Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill Combined with Section 179, this can wipe out the purchase price of a qualifying heavy vehicle in the first year. For lighter passenger vehicles still subject to the luxury caps, bonus depreciation raises the first-year cap to $20,300 for 2026, a meaningful bump but not a full write-off.10Internal Revenue Service. Rev. Proc. 2026-15
If You Lease Instead of Buy
Leasing changes the math. You never own the car, so there’s no asset to depreciate and no loan principal at issue. The lease payment itself is deductible as a rental expense, limited to your business-use percentage.1Internal Revenue Service. Topic No. 510, Business Use of Car Lease a car for $600 a month, use it 75% for business, deduct $450 a month. Fuel, insurance, and maintenance are deductible separately at the same percentage.
To keep leasing from turning into a workaround for expensive cars that would otherwise hit the depreciation caps, the IRS requires a small “lease inclusion amount” added back to income each year when the vehicle’s fair market value at lease start exceeds a set threshold.10Internal Revenue Service. Rev. Proc. 2026-15 The add-back is minor for moderately priced vehicles and grows with value. For someone who trades cars every few years anyway, leasing is often the simpler tax path.
A New Deduction Even Without Business Use
The One Big Beautiful Bill Act created a deduction that applies to personal-use cars. For loans taken out after December 31, 2024, you can deduct up to $10,000 per year in interest paid on qualifying vehicle loans for new, made-in-America vehicles bought for personal use.11Internal Revenue Service. Treasury, IRS Provide Guidance on the New Deduction for Car Loan Interest Under the One Big Beautiful Bill It’s available whether you itemize or take the standard deduction.
If you also use the vehicle for business and already deduct part of the loan interest through the actual expense method, the personal deduction has to be reduced by that amount. No double-dipping on the same interest dollars. Treasury and the IRS have issued proposed regulations with detailed eligibility rules, including requirements about U.S. final assembly and income limits, and the guidance is still developing.
What Happens When You Sell
Every depreciation dollar you claim comes back around when you sell or trade in the car. The IRS requires you to recapture that depreciation as ordinary income, taxed at your regular marginal rate rather than at capital gains rates. Claim $30,000 in total depreciation and sell for $15,000 above your adjusted basis, and that $15,000 is ordinary income. Any gain above the total depreciation you claimed is taxed at capital gains rates.
The takeaway: aggressive first-year deductions through Section 179 and bonus depreciation have real value because of the time value of money, but they aren’t free. The bill arrives when you dispose of the vehicle. Since 2018, trading a business vehicle in at a dealership is treated as a sale for tax purposes; the old like-kind exchange deferral no longer applies to vehicles.
Records You Have to Keep
Vehicle deductions are among the most audit-prone items on a tax return, and the burden of proof is on you. The IRS wants a contemporaneous log, meaning trips recorded at or near the time they happen rather than reconstructed at year-end from memory.12eCFR. 26 CFR 1.274-5 – Substantiation Requirements
Each log entry needs the date, destination, business purpose, and either odometer readings or distance driven. You also need total annual miles, business and personal, to calculate your business-use percentage. Without that percentage, neither method works.
Using actual expenses, keep receipts for every operating cost and match them to your log. Using the standard mileage rate, you still need the log, plus separate receipts for parking and tolls.6Internal Revenue Service. Standard Mileage Rates GPS-based tracking apps have made this easier, and the IRS accepts digital logs. Updating at least weekly is generally treated as contemporaneous. Keep the records for at least three years after filing the return that claims the deduction.