Standard Mileage Rate vs. Actual Expenses: Which Should You Choose?
Take the standard mileage rate if you drive a lot of miles in a modest, cheap-to-run car; take actual expenses if you drive fewer miles in an expensive one. Run both numbers once — and know that choosing actual expenses in a car's first business year is usually permanent for that car.
There are two ways to deduct the cost of a car you use for work, and you may use only one of them for a given vehicle in a given year.
- Standard mileage rate. Multiply business miles by the IRS rate — 72.5¢ through June 30, 2026 and 76¢ after. That single figure stands in for gas, maintenance, tires, insurance, registration and depreciation.
- Actual expenses. Add up what the car really cost you for the year, then deduct the business-use percentage of it — including depreciation, which is usually the largest piece.
Work the example, not the intuition
Take a driver with 18,000 business miles out of 24,000 total — 75% business use — in a paid-off sedan that costs about $6,800 a year to run:
| Method | Math | Deduction |
|---|---|---|
| Standard rate | 9,000 × 72.5¢ + 9,000 × 76¢ | $13,365 |
| Actual expenses | 75% of $6,800 (fully depreciated car) | $5,100 |
The standard rate wins by a wide margin, because it keeps paying a depreciation-sized amount per mile on a car that has no depreciation left to claim. Now change the car to a $62,000 SUV in its second year, with real costs of $17,500 including depreciation, and the same 75% business use gives $13,125 under actual expenses on only 8,000 business miles — where the standard rate would pay roughly $5,940.
The pattern behind both examples:
- High miles, cheap car → standard rate.
- Low miles, expensive car → actual expenses.
- Heavy repairs this year can flip a standard-rate car to actual expenses for that year — if you are allowed to switch. Which brings us to the trap.
The first-year rule that locks you in
To use the standard rate for a car you own, you must choose it in the first year you use that car for business. Do that, and you may switch back and forth in later years. Start with actual expenses instead, and you are generally stuck with actual expenses for as long as you use that vehicle for business.
For a leased car the rule is stricter still: if you use the standard rate, you must use it for the entire lease term, renewals included.
What this means in practice
In a car's first business year, the standard rate is the flexible choice even when actual expenses look slightly better. It keeps the door open. Taking actual expenses first closes it — which is fine if you did the math and the car is expensive, and expensive if you did it by accident.
Things that disqualify the standard rate
You cannot use the standard mileage rate if you:
- Operate five or more cars at the same time (a fleet);
- Claimed a Section 179 deduction, special depreciation, or any depreciation method other than straight-line on that car;
- Are a rural mail carrier who received a qualified reimbursement.
Note the second one. Writing off a vehicle purchase under Section 179 feels like a win in year one, and it permanently rules out the standard rate for that car.
What each method still lets you add
Business parking and tolls are deductible under both methods — they are never baked into the per-mile rate. Interest on a car loan and state property tax on the vehicle can also be deductible on the business share, depending on how you file.
Whichever you pick, the miles still matter
Actual expenses does not free you from tracking mileage. The deduction is the business percentage of your costs, and you cannot compute a percentage without knowing business miles and total miles. Every record described in how to prove mileage to the IRS applies to both methods — the actual-expense method just adds a folder of receipts on top.
The practical approach: track miles automatically all year, keep vehicle receipts in one place, and run the comparison once when you file. With a complete log both numbers take a minute to produce. Without one, you are not choosing a method — you are guessing at two.
This article is general information about US federal tax rules, not tax advice for your situation. Rates and rules change — check IRS.gov or ask a tax professional before you file.