If you drive for work and you're self-employed, the advice you'll hear most is "just use the standard mileage rate — it's simpler." And for a lot of people, it's right. But "simpler" and "bigger deduction" aren't the same thing, and the choice between the two methods has a one-way door in it that the easy advice almost never mentions. Pick wrong in year one and you can lock yourself out of the better option for as long as you own the vehicle.
Here's how the two methods actually compare for the 2026 tax year, which one tends to win in which situation, and the trap to avoid before you file.
A quick note: this is general information for U.S. self-employed filers, not advice on your specific return — a CPA or EA can run your exact numbers.
The two methods
There are exactly two ways to deduct the cost of a vehicle you use for business.
The standard mileage rate. You track your business miles and multiply by the IRS rate. For 2026, that rate is 72.5 cents per mile (up from 70 cents in 2025). Drive 8,000 business miles and that's a $5,800 deduction, full stop — no receipts for gas, no math on depreciation. The rate is designed to bake in fuel, maintenance, insurance, and wear-and-tear, so you don't track those separately.
Actual expenses. You add up what the vehicle genuinely costs you for the year — gas, insurance, repairs, registration, lease payments, and depreciation — and deduct the business-use percentage of that total. If 60% of your miles are for business, you deduct 60% of the real costs. This is more work, and it requires keeping the receipts, but for the right vehicle it produces a much larger number.
Both methods require one common thing, which I'll come back to: a record of your business versus personal miles.
Which one actually wins
There's no universal answer, but there are reliable patterns.
Standard mileage tends to win when you drive a lot of business miles in a relatively inexpensive, fuel-efficient, paid-off car. High mileage × 72.5¢ adds up fast, and a cheap reliable car doesn't generate enough real cost to beat it. For a lot of rideshare drivers, real-estate agents, and anyone putting serious miles on a modest vehicle, mileage is both simpler and bigger.
Actual expenses tends to win when the vehicle is expensive to own and you don't drive enormous mileage. A pricey SUV, heavy depreciation in the early years, high insurance, a lease with real monthly payments — multiply the business-use percentage against all of that and it often clears the mileage number comfortably. Low-mileage, high-cost is the actual-expenses sweet spot.
The honest answer for year one is: run both. Estimate your business miles, estimate your real costs, and compare. The difference can be hundreds or thousands of dollars, and it's the same drive either way.
The lock-in nobody mentions
This is the part that turns a simple choice into a consequential one. The IRS rules on switching aren't symmetric:
- For a vehicle you own, you must choose the standard mileage rate in the first year the car is available for business use. Do that, and in later years you can flip between standard mileage and actual expenses as it suits you. But if you use actual expenses in that first year instead — especially if you take accelerated depreciation — you're generally locked out of the standard mileage rate for that vehicle for as long as you own it.
- For a leased vehicle, if you start with the standard mileage rate you must stick with it for the entire lease, including renewals.
So the first-year decision quietly sets your options for years. The "just use mileage, it's easier" crowd usually lands on the safe side of this by accident — but if a tax preparer takes big first-year depreciation on a vehicle without flagging the trade-off, you may have given up the flexibility to ever use mileage on that car. Know which door you're walking through before you file the first return.
The log you need either way
Here's the thing both methods share, and the thing most people are worst at: you need a record of your business miles. Not an estimate reconstructed in April — a contemporaneous log. For each business trip, the IRS expects the date, the miles, and the business purpose, plus enough information to establish your business-use percentage against total miles driven.
This matters for both methods. Standard mileage is miles × rate, so the log is the deduction. And actual expenses needs the business-use percentage, which you can't compute without knowing business versus total miles. A shoebox of gas receipts with no mileage log can't support either method cleanly.
The practical fix is the same one that applies to every kind of record: capture as you go. A mileage log kept trip-by-trip is trivial; one reconstructed from memory eleven months later is both painful and shaky if anyone asks to see it. The same goes for the gas, insurance, and repair receipts you'll need if you go the actual-expenses route — caught in the moment and filed somewhere you control, they're there when you need them. (That's the whole reason Starlog keeps your expense records in your own Google Drive, captured when the spend happens rather than dug up at year-end.)
The bottom line
For 2026, the standard mileage rate is 72.5¢ — a clean, low-effort deduction that genuinely is the right call for high-mileage drivers in modest cars. But it isn't automatically the bigger number, and the first-year election can lock in your choice for years. Estimate both before you file the first return for a vehicle, keep a real mileage log either way, and you'll claim the larger deduction without painting yourself into a corner.