Actual Expense Method

The actual expense method deducts a business vehicle's real operating costs — gas, oil, repairs, tires, insurance, registration, licenses and depreciation — multiplied by the business-use percentage, instead of claiming the IRS standard mileage rate.

Also called:

actual expenses, actual car expenses

In practice

Topic 510 lists the costs as “gas, oil, repairs, tires, insurance, registration fees, licenses, and depreciation (or lease payments),” plus business parking and tolls. The choice is a one-way door on a vehicle you own: “to use the standard mileage rate for a car you own, you must choose to use it in the first year the car is available for use in your business.” Start with actual expenses and mileage is gone for that truck. It closes from the other side too — you can’t use the standard rate if you “used the Modified Accelerated Cost Recovery System (MACRS)” or “claimed a Section 179 deduction on the car.” Lease it and the standard rate, once chosen, runs the whole lease. General education, not tax advice.

Why it matters

Pick the method before the first return that includes the truck, because on a vehicle you own the door to the standard mileage rate only opens once.

Go deeper

Read the full post:

Racing Mileage Deduction: What You Can Actually Write Off on the Tow Rig and Trailer

Sources

Topic no. 510, Business use of car — IRS — the list of actual car expenses, the first-year election rule for a car you own, the full-lease-period rule, and the MACRS, non-straight-line depreciation and Section 179 bars on using the standard mileage rate.
Publication 463, Travel, Gift, and Car Expenses — IRS — 2025 revision: the list of situations in which the standard mileage rate isn’t allowed, covering five or more cars, non-straight-line depreciation, MACRS, a section 179 deduction, the special depreciation allowance, and actual car expenses after 1997 on a leased car.