For the self-employed, a car is often one of the largest deductible expenses — and one of the most scrutinized. The IRS offers two methods to deduct business driving, and choosing well (plus keeping records) can mean a meaningfully larger deduction. This guide compares them under the 2026 rules.
The two methods
- Standard mileage: deduct a flat rate for every business mile — 72.5¢ for 2026. This single rate is designed to cover gas, depreciation, insurance, maintenance, and repairs.
- Actual expenses: deduct the business-use percentage of your real costs — gas, insurance, repairs, registration, lease payments or depreciation, tires, and more.
You may use whichever produces the larger deduction, but the first-year choice carries rules (below).
The 2026 standard mileage rate
| Purpose | 2026 rate | 2025 rate |
|---|---|---|
| Business | 72.5¢ / mile | 70¢ / mile |
| Medical / moving (military) | 20.5¢ / mile | 21¢ / mile |
| Charitable | 14¢ / mile | 14¢ / mile |
At 72.5¢, driving 12,000 business miles in 2026 yields an $8,700 deduction — with no receipts to total up, just a mileage log. That reduces both income tax and, for the self-employed, self-employment tax.
Worked comparison
Sam drives 15,000 business miles in a $28,000 sedan that's 80% business use. Annual actual costs: $2,400 gas, $1,600 insurance, $900 maintenance, $300 registration, plus roughly $5,000 depreciation — $10,200 total, of which 80% ($8,160) is deductible. Standard mileage gives 15,000 × 72.5¢ = $10,875. Here mileage wins by $2,715. For a $70,000 SUV with heavy depreciation and only 6,000 miles, actual expenses would likely win. The lesson: the answer flips with vehicle cost and mileage, so compute both.
The first-year rule that locks you in
The choice in the first year a vehicle is used for business matters:
- Choose standard mileage in year one and you keep flexibility — you may switch to actual expenses in a later year (with some depreciation adjustments), and switch back.
- Choose actual expenses in year one (or take accelerated/bonus depreciation) and you're generally locked into actual expenses for the life of that vehicle.
Because standard mileage preserves your options, many advisors suggest starting with it unless year-one actual expenses are clearly far larger.
What "business miles" means
Deductible business miles are trips for work: to clients, job sites, the bank, supply runs, and between work locations. Your regular commute from home to a fixed workplace is not deductible. A qualifying home office can change the math, however — it can make your home your principal place of business, turning trips to clients into deductible business miles from the start.
Recordkeeping the IRS accepts
Whichever method you use, the deduction stands or falls on records:
- Mileage log: date, destination, business purpose, and miles for each trip. A phone app that auto-tracks trips is ideal.
- Total annual mileage: note your odometer at year start and end to establish business-use percentage.
- Receipts if you use actual expenses — keep them for at least three years.
Reconstructed, estimate-only logs are a frequent audit casualty. Contemporaneous records are the difference between a deduction that holds and one that's disallowed.
Bottom line
Compute both methods in the first year, lean toward standard mileage to keep flexibility unless actual expenses are clearly larger, and log every mile. Since the vehicle deduction lowers your net profit, it cuts your self-employment tax too — model the effect in the self-employment tax calculator, and remember the lower profit also lowers the quarterly estimated taxes you owe.
Section 179 and bonus depreciation
If you choose the actual-expense method, two provisions can accelerate the vehicle's depreciation. Section 179 lets a business expense much of a vehicle's cost in the first year rather than spreading it over years, and bonus depreciation allows an additional first-year write-off. Passenger cars face annual "luxury auto" dollar caps, but heavy SUVs and trucks above 6,000 pounds gross weight qualify for far larger first-year deductions — a well-known planning point for business owners buying a large vehicle. The catch: taking accelerated depreciation locks you into the actual-expense method for that vehicle and can trigger depreciation recapture (extra tax) if you later sell it or business use drops below 50%.
Key takeaways
- The 2026 standard mileage rate is 72.5¢ per business mile.
- High miles favor standard mileage; expensive, low-mileage vehicles favor actual expenses.
- Starting with standard mileage preserves your flexibility to switch later.
- Your commute is never deductible; a home office can change that math.
- Section 179 and bonus depreciation accelerate write-offs but lock in actual expenses.