Self-employed filers claim vehicle costs as the Schedule C mileage deduction (or actual vehicle expenses) on Line 9 of Schedule C (Form 1040). For 2026, the standard mileage rate is 72.5 cents per business mile.1Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile You can use that flat rate or deduct the business-use percentage of your actual vehicle costs, and every deductible mile trims both your income tax and the 15.3% self-employment tax on your net profit.2Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The method you pick in the first year you use the vehicle for business affects what you’re allowed to do in every year after, so it’s worth understanding both before you file.
Which Miles You Can Actually Deduct
The IRS separates business driving from commuting, and commuting is never deductible no matter how long the drive. What does count: trips between two business locations, drives from your office to a client, runs from a job site to pick up supplies, and travel to temporary work sites where you expect to work less than a year.
The home office rule changes the picture dramatically. If your home office qualifies as your principal place of business, your home is a business location, and driving from it to a client or job site becomes a deductible business trip instead of a commute.3Internal Revenue Service. Publication 587 – Business Use of Your Home To qualify, you have to use the space exclusively and regularly for administrative or management work, and you can’t have another fixed location where you handle those tasks. A plumber who schedules jobs, invoices, and keeps the books from a dedicated room at home meets the test; a consultant who rents a downtown coworking desk for the same tasks doesn’t.
Personal stops on a business trip come out of the deductible portion. Drive to a client, then swing by the grocery store on the way home, and only the miles to and from the client count.
The Standard Mileage Rate
The standard method is arithmetic: business miles times the IRS rate. For 2026 that’s 72.5 cents.1Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile Fifteen thousand business miles produces a $10,875 deduction. The rate is designed to absorb gas, maintenance, repairs, insurance, and depreciation in a single number.
Business-related tolls and parking are deductible on top of the rate, not folded into it.4Internal Revenue Service. Topic No. 510 – Business Use of Car
You have to own or lease the vehicle to use the standard rate, you can’t have claimed a Section 179 deduction or accelerated depreciation on it, and you can’t be operating five or more vehicles simultaneously for business.4Internal Revenue Service. Topic No. 510 – Business Use of Car That last one mostly catches fleet operators, not typical sole proprietors.
The Actual Expense Method
Actual expenses require more paperwork and can produce a much larger deduction, especially for a newer or costlier vehicle. First, figure your business-use percentage: business miles divided by total miles. If you drove 20,000 miles and 14,000 were for business, that’s 70%. Apply that percentage to what you actually spent on the vehicle during the year: gas, oil changes, tires, repairs, insurance, registration, and lease payments.
Depreciation is what usually swings the math toward actual expenses on a newer vehicle. You deduct a share of the purchase price each year, but the IRS caps the annual amount for passenger vehicles under 6,000 pounds. For vehicles placed in service in 2026, year-one depreciation is capped at $20,300 with bonus depreciation or $12,300 without; year two is $19,800; year three is $11,900; and each year after that is $7,160. To take bonus depreciation, you have to use the vehicle more than 50% for business in the year it’s placed in service.5Internal Revenue Service. Rev. Proc. 2026-15
Vehicles rated over 6,000 pounds — many full-size SUVs, pickups, and vans — sit outside those passenger-car caps and may qualify for a larger Section 179 write-off in year one, subject to a separate SUV cap around $32,000 for 2026. One warning attaches to aggressive first-year depreciation: if business use later drops to 50% or below, the IRS makes you add back the difference between what you deducted and what straight-line depreciation would have allowed, and future depreciation switches to the slower method.6Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
Picking a Method — and What Locks In
Neither method wins for everyone. The standard rate tends to come out ahead when you drive a lot of business miles in a modest or fuel-efficient vehicle. Twenty thousand business miles a year on a paid-off sedan will usually beat actual costs, and you only have to track mileage. Actual expenses tend to win on a newer or higher-cost vehicle, particularly when depreciation and heavy operating costs are in play. A contractor who buys a $55,000 truck used 80% for business can pull far more out of first-year depreciation than the flat rate would deliver.
The first year matters more than any later year. If you choose the standard rate in year one on a vehicle you own, you can switch to actual expenses later. If you choose actual expenses first, you’re locked into actual expenses for the life of that vehicle. Leased vehicles are stricter: pick the standard rate on a lease, and you have to keep using it for the entire lease, renewals included.7Internal Revenue Service. Income and Expenses 5
A safe move in year one: run the numbers both ways. Starting with the standard rate keeps the door open. Starting with actual expenses closes it.
The Records the IRS Expects
Federal law requires “adequate records” to back up any vehicle expense deduction.8Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses In practice, that means a contemporaneous mileage log and, for the actual expense method, receipts.
Your log needs four things per trip: date, destination, business purpose, and miles driven. You also need odometer readings at the start and end of each tax year. A notebook works. An app is easier to keep up with. What matters is when you write things down. The IRS expects entries at or near the time of the trip — weekly is generally considered timely. Reconstructing months of trips at tax time isn’t, and auditors can tell the difference between a running log and one built in a single sitting.
For actual expenses, keep receipts for gas, oil, repairs, insurance, registration, and anything else vehicle-related, plus records of total and business miles so your business-use percentage is defensible. Bank and credit card statements can fill gaps but shouldn’t be your only documentation.
What Happens Without the Records
The IRS doesn’t just remove an unsupported deduction. If an audit reduces your deduction because your records don’t hold up, the additional tax carries a 20% accuracy-related penalty for negligence or disregard of the rules. The same 20% penalty applies to a “substantial understatement,” which for individuals means the tax you should have paid exceeds what you reported by more than the greater of 10% or $5,000.9Internal Revenue Service. Accuracy-Related Penalty Add interest, and the cost can easily exceed what the deduction saved you in the first place.
Where It Goes on Schedule C
Your total vehicle deduction lands on Line 9, “Car and truck expenses,” in Part II of Schedule C.10Internal Revenue Service. Instructions for Schedule C (Form 1040)11Internal Revenue Service. Schedule C (Form 1040) 2025 – Profit or Loss From Business12Internal Revenue Service. About Form 4562, Depreciation and Amortization
Every filer claiming a vehicle deduction also completes Part IV of Schedule C, “Information on Your Vehicle.” It asks for total miles, commuting miles, business-use percentage, and whether you have written evidence to support the deduction.10Internal Revenue Service. Instructions for Schedule C (Form 1040) Answering “No” to the evidence question doesn’t automatically trigger anything, but it strips away any benefit of the doubt if the return is examined.
When You Sell the Vehicle
Selling, trading in, or scrapping a vehicle you’ve been depreciating has tax consequences you report on Form 4797.13Internal Revenue Service. Instructions for Form 4797, Sales of Business Property Your adjusted basis is the original cost minus depreciation claimed (or that could have been claimed). Sell above that basis and you have a gain, with the portion attributable to depreciation taxed as ordinary income rather than at capital gains rates. Sell below it and you may have a deductible loss.
This catches people who used the standard mileage rate and assume depreciation wasn’t part of the picture. It was — a per-mile depreciation component is baked into the standard rate, and the IRS expects you to reduce your basis by it when you sell.