Vehicle expense guide
Mileage Tax Deduction Guide for Small Business
Understand business mileage records, commuting boundaries, standard-versus-actual methods, and the receipts to keep for a defensible vehicle deduction.
Direct answer
Direct answer
A business mileage deduction generally starts with a contemporaneous log showing the date, destination, business purpose, and business distance for each trip. Depending on the rules and elections that apply, you may use a standard mileage method or allocate actual vehicle costs by business use. Ordinary commuting is generally treated differently from business travel, and a fuel receipt by itself does not prove business miles.
Start with the purpose of each trip
Business mileage is driven by where you went and why, not simply by owning a business vehicle. Record the date, start and destination, customer or business purpose, and distance. A route between client locations, a supplier run, or travel to a temporary business location may be treated differently from the ordinary trip between home and a regular workplace.
Home-office rules can affect where a business trip begins, and vehicle rules differ by entity, worker status, jurisdiction, and fact pattern. Write down the route facts; let a qualified tax professional determine their treatment.
Standard mileage versus actual vehicle costs
A standard mileage method applies an official rate to supported business miles. An actual-cost method generally totals eligible costs—such as fuel, repairs, insurance, registration, lease costs, or depreciation—and allocates them using the business-use percentage. Availability, rates, elections, and switching rules can change, so confirm the method before filing.
Do not mix methods casually. Keep a mileage log under either approach because actual costs still need a defensible business-use allocation. Preserve purchase and lease documents for a vehicle even if day-to-day calculations use mileage.
What records to keep
A useful mileage log includes the vehicle, date, start and end locations, business purpose, and distance. Odometer readings at the beginning and end of the year or business-use period help establish total use. Keep the log close to real time instead of recreating it from calendar entries months later.
- Fuel, charging, oil, repairs, tires, insurance, registration, and lease or finance records.
- Parking and toll receipts tied to the relevant business trip.
- Platform, dispatch, calendar, or customer records that corroborate business travel.
- Notes for mixed-purpose trips and any allocation method used.
Build a vehicle receipt workflow
Photograph fuel, toll, parking, maintenance, and repair receipts before they collect in the vehicle. Tag the vehicle and business purpose where the image cannot supply them. Review weekly against the mileage log and card activity so missing trips or duplicate receipts are found early.
At month-end, export vehicle costs and the mileage summary separately. That makes it easier for the accountant to apply the selected method without treating every fuel receipt as a deduction by default.
Common mileage mistakes
Frequent problems include estimating a round number of miles, counting ordinary commuting, omitting personal use, failing to identify the vehicle, and using fuel receipts as the only evidence. Another is forgetting parking and tolls because they were paid by app or transponder rather than paper receipt.
Correct the record while routes are still available. Do not invent missing trips; mark the gap and use legitimate corroborating evidence under professional guidance.
Common questions
FAQ
Are gas receipts enough to claim business mileage?
No. Gas receipts document vehicle cost, not the distance or business purpose of a trip. Keep a contemporaneous mileage log and the records required for the calculation method you use.
Can I deduct commuting miles?
Ordinary commuting is generally treated differently from business travel, but home-office, temporary-location, and other rules can affect the result. Record the facts and ask a qualified adviser about your situation.
Do I need receipts if I use a standard mileage rate?
You still need a mileage log and vehicle records. Keep parking, toll, purchase, lease, and other documents your adviser recommends because they may be relevant outside the per-mile calculation.
See it in context
Receipt workflows by business
ReceiptLine uses AI to extract and suggest expense details. It is not accounting or tax advice. Review each receipt and confirm the correct treatment with a qualified professional for your jurisdiction.