What car expenses can I write-off?

[McAllie]

You can write off car expenses for the portion used directly for business, using either the IRS standard mileage rate or the actual expenses method. Commuting from home to a regular workplace is not deductible. The choice between methods depends on your vehicle's cost and use, and meticulous record-keeping is legally required.

The two primary methods are the Standard Mileage Rate and the Actual Expenses method. You must choose one for each vehicle in the first year of business use.

Standard Mileage Rate Method This is the simpler option. You deduct a set rate for every business mile driven. The rate, set annually by the IRS, covers variable costs like gas, maintenance, and depreciation. For 2025, the rate is 70 cents per mile. It is projected to be 72.5 cents per mile for 2026. Even with this method, you can still separately deduct business-related parking fees and tolls.

Actual Expenses Method This method involves tracking all vehicle costs and deducting the business-use percentage. It can yield a larger deduction for newer, expensive vehicles or those with low business mileage but high fixed costs. Deductible costs include:

• Gas and oil
• Repairs, maintenance, and tires
• Insurance premiums
• Registration and license fees
• Lease payments
• Depreciation (if you own the vehicle)
• Business-related parking fees and tolls
• Interest on an auto loan for the business-use portion

You calculate the deduction by multiplying the total of these annual expenses by your business-use percentage. For example, if you drive 10,000 miles total in a year with 6,000 for business, your business-use percentage is 60%. If your total actual expenses are $8,000, your deductible amount is $4,800 (60% of $8,000).

Choosing the Right Method The optimal method is not universal. The standard rate is straightforward, but actual expenses may be better for high-cost vehicles. You cannot switch to the standard mileage rate if you used the actual method and claimed depreciation in a prior year. A brief comparison based on common scenarios can guide your decision.

Scenario	Likely Advantageous Method	Key Reason
Older, fuel-efficient car, high business mileage	Standard Mileage Rate	Simplicity; rate effectively covers variable costs.
New luxury vehicle, low annual mileage	Actual Expenses	Depreciation and fixed costs (insurance, loan interest) are significant.
Vehicle used heavily for both business and personal	Actual Expenses	Allows precise allocation of all costs based on a detailed mileage log.

Critical Documentation and Rules The IRS requires contemporaneous records. A mileage log must include the date, destination, business purpose, and odometer readings for each trip. Digital apps or a notebook are acceptable. Remember, driving between your home and a regular workplace is considered personal commuting and is never deductible. However, driving from your home office to a client meeting is deductible. The deduction is always prorated; you can only claim the percentage of expenses directly attributable to genuine business activities.

[DeReese]

As a freelance consultant, I use the standard mileage rate—it’s a lifesaver for simplicity. I just use a mileage-tracking app on my phone that runs in the background. Every quarter, I run a report, multiply my business miles by the current IRS rate (70 cents for 2025), and add any client-site parking receipts. That’s my deduction.

I tried tracking every gas and repair bill once, and it was a nightmare. For my older sedan, the standard rate always gives me a solid, defensible deduction without the receipt-shuffling hassle. My accountant just needs my annual mileage log from the app and the grand total.

[VanDamian]

My perspective is from owning a small landscaping business with two pickup trucks. We buy them new and use them hard for work, but the family also uses them on weekends. We always elect the actual expenses method because the depreciation deduction in the first few years is substantial.

We maintain a strict logbook in each truck. Every Monday morning, the driver notes the odometer. For any trip not to a job site, they note the purpose. At year-end, we tally all costs: fuel, insurance, repairs, everything. Our business use usually comes out to around 80%. We multiply our total expenses by that 80% rate.

The key is consistency. We treat the logbook as a non-negotiable part of the job. It turns a significant asset purchase into a major tax advantage over its lifespan.

[MichaelLynn]

I drive for a rideshare platform, so my car is my office. My tax situation is all about separating business from personal use. I use the actual expenses method because I have a car payment and full coverage insurance.

The biggest task is tracking. I use a dedicated app that classifies miles as “online” (business) or “offline” (personal). It generates a percentage. All my auto costs—gas, loan interest, insurance, even my monthly car wash subscription—get multiplied by that business percentage.

You can’t deduct commuting from your home to a general area where you log on. But once that app is on, every mile is business. Keeping a digital trail is the only way to manage this mixed-use reality and claim what you’re legitimately owed.

[Lois]

The foundational rule is that only the business-use portion of an expense is deductible. This requires a reliable method to determine that portion, which is almost always based on mileage. A contemporaneous log is not just recommended; it is your first line of defense in an audit.

Many clients ask about commuting. The rule is firm: travel from your residence to a regular, fixed place of business is nondeductible personal commuting. The “office” must qualify as a principal place of business under IRS rules for that home-to-office travel to shift from personal to deductible.

When choosing between the standard rate and actual expenses, project both. For a new vehicle, actual expenses often provide a larger write-off due to accelerated depreciation deductions in early years. However, once you choose actual expenses for a vehicle, switching to the standard mileage rate in a later year can be restrictive and may not be allowed if you claimed depreciation.