Mileage and Vehicle Deductions: What Actually Counts

Of all the deductions self-employed people and small business owners claim, vehicle expenses get more scrutiny than almost anything else, mostly because the record-keeping bar is high and most people do not clear it. The good news is that the rules themselves are not complicated. The discipline required to document them properly is where things fall apart.

Standard mileage vs. actual expenses

You generally have two ways to deduct the business use of a vehicle:

• Standard mileage rate. You track business miles driven and multiply by a per-mile rate the IRS sets annually. That rate changes from year to year based on the cost of operating a vehicle, so always confirm the current-year figure rather than relying on memory or last year's return. This method is simpler and requires less recordkeeping around receipts, since fuel, maintenance, and depreciation are all baked into the rate.
• Actual expenses. You track every real cost of operating the vehicle — fuel, insurance, repairs, tires, registration, depreciation or lease payments — and deduct the business-use percentage of the total. This method takes more work but can produce a bigger deduction for a vehicle with high operating costs or heavy business use, particularly a larger truck.

There are rules around switching between methods once you have started with a given vehicle, and the actual-expense method has its own depreciation mechanics for vehicles that can get complicated fast. Decide which method makes sense in the first year you place the vehicle in service, ideally with your preparer, rather than picking whichever number looks bigger at the end of the year.

The rule that surprises almost everyone: commuting is not deductible

This is the single most common misunderstanding we see. Driving from your home to your regular place of business — even if that business is your own — is a nondeductible commute, exactly like an employee driving to an office. It does not matter that you are self-employed. It does not matter that the truck has your company name on the door.

Where it gets more useful: once you are out working, driving between job sites, to a supplier, to a client meeting, or to pick up materials is generally deductible business mileage. A Hudson Oaks contractor who drives from home to the first job site of the day has a nondeductible commute for that first leg — but every mile driven after that, between job sites across Fort Worth and back, is business mileage. If your home qualifies as your principal place of business under the home office rules, the calculation can change, because trips from a qualifying home office to job sites may count as business mileage from the first mile. That is one more reason the home office and mileage questions are worth discussing together with your preparer rather than assuming one has no bearing on the other.

The truck or SUV question

Larger vehicles — trucks, vans, and certain SUVs above a specific weight threshold — are sometimes treated differently under the tax code than passenger cars, particularly around depreciation and first-year expensing rules. The weight thresholds and the specific rules attached to them are technical and change periodically, so if you are deciding between a heavier truck and a standard vehicle for business use, that is a conversation to have before the purchase, not after. What we can say without any numbers attached: the vehicle's business-use percentage still has to be real and documented regardless of size or type. A bigger vehicle does not loosen the recordkeeping requirement.

Contemporaneous logs: the part people skip

The IRS wants a contemporaneous log — meaning notes made close to the time of the trip, not reconstructed from memory the week before you file. A defensible mileage log generally includes the date, the business purpose, the starting and ending locations or odometer readings, and the miles driven. "Client meetings, various" written once a year does not hold up. "Drove from shop to job site in Aledo, then to supplier in Fort Worth for materials, back to shop" does.

This is the single most common reason a mileage deduction gets reduced or disallowed on examination — not because the driving did not happen, but because the log cannot prove it happened the way it was claimed.

Apps vs. paper

A phone-based mileage tracking app that logs trips automatically using GPS, and lets you tag each one as business or personal at the end of the day, solves the contemporaneous problem almost entirely — it is timestamped and hard to argue with. A paper log works too, if you are honestly disciplined enough to fill it in the same day. Most people are not, which is why the apps tend to win out in practice. Either way, the habit that matters is logging the trip the same day it happens, not batching a month of memory into one sitting.

Parking, tolls, and interest

Business-related parking fees and tolls are generally deductible in addition to whichever mileage or expense method you use — they are not baked into the standard mileage rate. If you finance a vehicle used for business, the business-use share of the loan interest may also be deductible under the actual expense method. Keep these receipts separately; they are easy to forget because they feel incidental compared to the mileage itself.

Pick a system and stick with it for the year

The owners who never have a problem with this deduction are not the ones who drive the most efficient routes — they are the ones who log every trip the same way, every day, all year. Whatever system you choose, consistency is what protects the deduction if it is ever questioned.

This article is general information, not tax advice. Current mileage rates, vehicle weight thresholds, and depreciation rules change and should be confirmed with a professional for your specific vehicle and situation.

Not sure which method fits your vehicle and your driving? Call RD Precision Tax Service in Weatherford at (817) 480-6649, or request a free estimate. Robert has been preparing taxes for contractors and small business owners across Weatherford and Parker County since 2017.