For any business owner who drives, mileage is one of the most valuable and most commonly missed deductions. The reason it gets missed is simple: it has to be tracked as you go, and busy owners forget. Money that could have lowered your tax bill quietly drives off. Here is how the deduction works and how to capture it. This is general information, not tax advice; confirm specifics with your accountant.
Why business driving is deductible
When you drive for business, to a client, a job site, a supplier, the government recognizes that as a real cost of doing business, and lets you deduct it. Commuting and personal driving do not count, but genuine business trips do. For people who drive a lot, real estate agents, contractors, service providers, this can add up to a substantial deduction over a year. The catch is that you have to prove it, which means tracking.
Two ways to claim it
There are generally two methods, and you typically choose the one that benefits you more:
- Standard mileage rate. You multiply your business miles by a set per-mile rate. Simple, and often generous for ordinary vehicles.
- Actual expenses. You track the real costs of operating the vehicle, gas, maintenance, insurance, depreciation, and deduct the business-use portion. More work, but potentially larger for expensive vehicles.
Good records let you or your accountant compare and choose the better method. Without records, you cannot use either properly.
Keep a contemporaneous log
The strongest mileage records are contemporaneous, kept at the time of the trip, not reconstructed months later. For each business trip, note the date, the purpose, and the miles. Apps make this nearly automatic, or a simple logbook works. What matters is consistency: a log kept all year is defensible and complete; a guess assembled in April is neither, and usually understates your real business miles, costing you money.
How it fits your bookkeeping
Mileage is one piece of a bigger habit: capturing every deductible expense as it happens. When your bookkeeping is consistent and your vehicle costs and mileage are tracked alongside everything else, your deductions are organized and ready at tax time. This is exactly what our tax-ready bookkeeping ensures, so nothing eligible gets left behind.
The bottom line
Business mileage is real money, but only if you track it. Log your business trips as you go, keep records that let you choose the better method, and fold it into consistent bookkeeping so it is captured with the rest of your deductions. Do that and you stop leaving money on the road. Start by getting your expenses, mileage included, organized so you can see everything you are entitled to claim.
Separate business and personal driving cleanly
The line that matters for this deduction is business versus personal, and keeping it clean is what makes your log defensible. Business driving is travel for work, to clients, job sites, suppliers, business errands; your commute and personal trips do not count. The simplest way to stay accurate is to log business trips as they happen and treat everything else as personal by default. Trying to sort it out at year-end from a full odometer reading and a hazy memory is where people either understate their deduction or record miles they cannot support. A clean, contemporaneous separation protects both your deduction and you.
Fold it into one habit
The reason mileage gets missed is that it feels separate from the rest of your bookkeeping, a thing to remember on top of everything else. The fix is to make it part of one habit rather than a standalone chore. When capturing every business cost as it happens is simply how you operate, mileage rides along with it, logged like any other expense, ready at tax time with everything else. Owners who treat expense capture as a single, consistent routine rarely miss mileage; those who treat each type of deduction as a separate task tend to drop the ones, like mileage, that require in-the-moment tracking.
Finally, remember that consistency is what makes any mileage method hold up. Whether you use the standard rate or actual expenses, the deduction is only as strong as the records behind it, so pick a tracking habit and stick with it all year. A steady log quietly builds into a meaningful deduction by December, while a good intention you never acted on leaves that money unclaimed. Small, consistent tracking beats a big year-end effort every time.
Key takeaways
- Business driving is deductible, but only if you track it.
- You generally choose between the mileage rate and actual expenses.
- A contemporaneous log is what makes the deduction defensible.
- Reconstructed-from-memory mileage is money left on the table.
Frequently asked questions
Is business mileage deductible?
Yes, business use of a vehicle is generally deductible, but you must track it. Personal driving does not qualify.
Mileage rate or actual expenses, which is better?
It depends. The standard mileage rate is simpler; actual expenses can be larger for higher-cost vehicles. Your accountant can advise, and good records let you compare.
What records do I need?
A log of your business trips, date, purpose, and miles, kept as you go. A contemporaneous log is far stronger than a guess.
