Every guide on this topic runs the same comparison: add up your vehicle costs for the year, multiply your business miles by the IRS rate, and take whichever number is bigger. That comparison is correct and it can still lead you into a decision you are not allowed to reverse.
Quick answer: If you own the car and use the actual expense method in its first business year, you can never use the standard mileage rate for that vehicle again. Start with standard mileage and you keep both options for later years. Because depreciation is front-loaded, year one almost always flatters actual expenses — on a $28,000 car driven 15,000 business miles, year one says actual ($18,880 vs $11,137) while five years says standard ($56,738 vs $49,600). Follow the one-year number and you lose about $7,138 and the right to change your mind.
Per IRS Publication 463, for a vehicle you own you must elect the standard mileage rate in the first year it's available for business use if you want that method available at all. Only after making that election can you move between the two methods in later years.
Turn it around and the door closes. Claim actual expenses — and the depreciation that comes with it — in year one, and standard mileage is gone for that car's entire business life. There is no form to undo it.
So the two choices carry different risk. Standard mileage in year one buys flexibility. Actual expenses in year one spends it, permanently, in exchange for a bigger deduction right now.
Leases follow a stricter version: if you elect standard mileage on a leased vehicle, you must keep it for the entire lease term, including renewals. No switching mid-lease in either direction.
Depreciation front-loads hard. Bonus depreciation and Section 179 can concentrate an enormous deduction into the first year, after which the actual-expense column drops to operating costs plus a much smaller depreciation figure. The mileage deduction, by contrast, is flat — the same rate every year, forever, as long as you keep driving.
Take a $28,000 passenger car, 80% business use, 15,000 business miles a year, $6,800 of annual running costs:
| Standard mileage | Actual expenses | Which looks better | |
|---|---|---|---|
| Year 1 only | $11,137 | $18,880 | Actual |
| Five-year total | $56,738 | $49,600 | Standard |
The first row is the comparison you'll find on most sites. The second row is the one that determines what you actually deduct over the years you own the car — and the two disagree. Elect actual expenses on the strength of that $18,880 and you've locked in the worse five-year outcome and closed the door behind you.
See whether your year-one answer and your five-year answer disagree before you make the election.
Mileage Deduction Calculator →Sometimes the big first-year number is not a trap — it's the whole point. The clearest case is a heavy vehicle.
A $62,000 SUV or pickup over 6,000 lbs GVWR, 80% business use, driven only 8,000 business miles a year:
| Standard mileage | Actual expenses | |
|---|---|---|
| Year 1 | $5,940 | $44,864 |
| Five-year total | $30,260 | $85,529 |
Here both horizons agree, and by a wide margin. Vehicles over 6,000 lbs GVWR escape the passenger-car depreciation caps, so Section 179 expensing — up to $30,500 for heavy SUVs in 2026 — plus 40% bonus depreciation can put most of the purchase price into year one. Low mileage makes the standard rate weak at the same time. That combination is what the actual expense method exists for.
The pattern generalises: actual expenses wins on expensive vehicles driven few business miles; standard mileage wins on modest vehicles driven many. Where you sit is a calculation, not a rule.
2026 is awkward because the rate changed in the middle of the year. Business mileage is 72.5 cents from January 1 through June 30 and 76 cents from July 1 through December 31. Mid-year changes are rare, and the practical consequence is that you need to split your mileage log at June 30 and apply each rate to its own half rather than averaging.
Medical and qualifying moving mileage is 23.5 cents from July 1. The charitable rate remains 14 cents — that one is fixed in statute and only Congress can move it, which is why it hasn't tracked the cost of driving for years.
Parking and tolls on business trips are deductible on top of either method, which people routinely forget.
This is general information, not tax advice, and the depreciation rules in particular are more intricate than any article can capture — placed-in-service dates, mid-quarter conventions and state treatment all matter. Speak to a CPA before making the first-year election, because it is one of the few vehicle tax decisions you genuinely cannot take back.