Vehicle Deductions for Business Owners: Standard Mileage, Actual Expenses, and Records

Vehicle deductions are common, valuable, and heavily documented for a reason. The IRS requires strict substantiation of vehicle expenses because personal use is easy to blur into business. The good news is that a simple, consistent log meets most needs.

What counts as business use

Business use generally includes travel from your office or main workplace to clients, job sites, suppliers, banks for business errands, and other business locations, as well as travel between two workplaces. It does not include commuting between your home and a regular place of business, which is personal. If your home is your principal place of business under the home office rules, trips from home to other business locations can be deductible. See home office deduction. If you have a temporary work location, trips from home to that location may qualify under specific rules.

Personal use, such as commuting, errands, and vacations, is not deductible. If you use the same vehicle for both, you must allocate.

Two methods

Standard mileage rate. Multiply business miles by the IRS rate for the year. The rate is set annually. For 2025 it was 70 cents per mile. The rate is intended to cover gas, maintenance, insurance, depreciation, and other operating costs, so you do not deduct those separately. You can add business-related parking fees and tolls. You must generally choose this method in the first year the vehicle is used for business, in order to use it in later years, and in some cases switching methods later has restrictions.

Actual expense method. Deduct the business share of the real costs: fuel, oil, repairs, tires, insurance, registration, lease payments, and depreciation (subject to limits). Business share equals business miles divided by total miles. This method requires tracking all costs and total miles, and it can produce a larger deduction for more expensive vehicles or cars with high operating costs.

Which one wins depends on the vehicle, the miles driven, and the costs. High-mileage users of an efficient, older vehicle often do well with the standard rate. Owners of expensive vehicles used heavily for business may do better with actual expenses and depreciation, subject to the luxury vehicle limits.

Records required

The log should be made at or near the time of the trip. It should record:

The date.
The destination or purpose.
The business purpose of the trip.
The miles driven.
Odometer readings at the start and end of the year.
Total miles for the year, including personal.

Mileage tracking apps that use GPS can create these logs and are a practical choice, but you still need to confirm the business purpose. A calendar with client appointments can help corroborate. For actual expenses, keep receipts.

A reconstruction after the fact is weak. If the IRS challenges a deduction with no log, the deduction may be disallowed entirely.

Ownership structure

Where the vehicle title sits affects the deduction:

Sole proprietor or disregarded LLC: vehicle owned personally or by the LLC is treated as the owner's, and deductions go on Schedule C.
Partnership or LLC taxed as partnership: the entity may own the vehicle and deduct its costs, or partners may use their own vehicles and deduct unreimbursed partner expenses if the agreement requires.
S-corp or C-corp: the corporation can own the vehicle and deduct actual costs, with personal use treated as compensation to the employee-owner and included in W-2 wages. Or the owner owns the vehicle and the corporation reimburses business mileage under an accountable plan, which is often cleaner.

Employees, including S-corp owner-employees, generally cannot deduct unreimbursed vehicle costs on their personal returns under current federal law, so structure matters.

Company-owned vehicles and personal use

If a corporation owns a vehicle and an employee-owner uses it for personal purposes, the value of personal use is generally a taxable fringe benefit, which must be reported as wages. Methods for valuing personal use include the annual lease value rule and the cents-per-mile rule, with specific eligibility conditions. Failing to include personal use is a common error. Records of business use are equally important.

Depreciation, Section 179, and heavy vehicles

Passenger vehicles are subject to annual depreciation caps under the "luxury auto" rules. Heavier vehicles, such as certain SUVs, trucks, and vans with a gross vehicle weight rating above 6,000 pounds, are exempt from those caps, but other limits may apply, such as a lower Section 179 cap for certain SUVs. Vehicles that are not suitable for personal use (specialized work vans, for instance) may have different rules. Bonus depreciation rules have changed by legislation in recent years. Because of these details, consult a professional before buying a vehicle for tax reasons. Buying a vehicle mainly for a deduction is rarely a good business decision. See Section 179 and depreciation basics.

Leasing versus buying

Leasing a vehicle allows you to deduct the business share of lease payments, with an inclusion amount for luxury vehicles that reduces the deduction. Buying gives depreciation deductions instead. The standard mileage rate cannot be used with certain leases unless used for the entire lease period. Compare costs in your specific situation.

Common mistakes

Deducting commuting miles.
No log, or a log created at year-end from memory.
Claiming 100 percent business use for a vehicle also used personally.
Using both methods in the same year for the same vehicle.
Deducting the full purchase price without regard to the rules.
Ignoring personal use of a company-owned vehicle by an S-corp owner.
Not tracking total miles. Business percentage needs the denominator.
Overlooking parking and tolls (deductible in addition to standard mileage).
Missing the ability to reimburse through an accountable plan.

A simple system

Choose an app or a paper log and use it from the first day of the year.
Record odometer readings on January 1 and December 31.
Note business purpose for each trip.
Keep receipts for actual expenses if using that method.
Review the log monthly.
Give your preparer the total miles, business miles, and vehicle details at tax time.

For guidance on the right structure for vehicles in your business, AE Tax Advisors can assist, and a discovery call is a simple first step.