Every mile you drive for work feels like it should shave something off your tax bill — but the IRS doesn't see it that way. The difference between a mile that's deductible and one that isn't often comes down to a single distinction: is it a business mile or a commuting mile? Get that line wrong and you either leave money on the table or invite an audit. Here's how to tell them apart and claim what you're actually owed.

The core distinction

The IRS treats the drive between your home and your regular place of work as a personal expense, not a business one. This is your commute, and it doesn't matter how far you drive or how much traffic you sit in — those miles are not deductible.

Business miles, on the other hand, are the miles you drive for work-related purposes after you've reached your workplace, or trips that fall outside your ordinary home-to-office routine. These are the miles that can reduce your taxable income.

What counts as commuting

  • Driving from your home to your regular office or job site
  • The return trip from work back home
  • Stops for coffee, breakfast, or errands along your normal commute route

What counts as business miles

  • Traveling between two different work locations or job sites in the same day
  • Driving to meet a client, customer, or vendor
  • Trips to the bank, post office, or store for business supplies
  • Driving to a temporary work location outside your metropolitan area
  • Trips to the airport for a business journey

The home office game-changer

If your home qualifies as your principal place of business, the rules shift in your favor. When your home office is your main workplace, a trip from there to conduct business elsewhere isn't a commute at all — it counts as a business mile from the moment you pull out of the driveway.

This is one of the most valuable rules for self-employed people and small business owners. Instead of losing that first and last leg of the day as non-deductible commuting, the entire round trip to a client, supplier, or second location becomes deductible business mileage. To rely on this, though, your home office needs to genuinely meet the IRS definition of a principal place of business.

Two ways to claim the deduction

Once you've identified your business miles, you have two methods for turning them into a deduction. You generally can't mix them for the same vehicle in the same year, so it pays to understand both.

The standard mileage rate

With this method, you multiply your business miles by a set per-mile rate published by the IRS each year. It's simple: track the miles, apply the rate, and you have your deduction. On top of the rate, you can also deduct business-related tolls and parking fees separately.

The actual expense method

Here you track the real costs of operating your vehicle — gas, oil, repairs, insurance, registration, and depreciation — then deduct the business-use percentage of those totals. This method takes more record-keeping but can produce a larger deduction if your vehicle is expensive to run.

Whichever route you choose, tolls and parking incurred for business trips remain deductible on top of the mileage or expense figure.

Who can actually claim it

Not everyone who drives for work gets to deduct mileage anymore. The deduction is most relevant to:

  • Self-employed individuals and independent contractors who use their vehicle for business
  • Small business owners running their operations from a home office or multiple locations

W-2 employees generally can't deduct unreimbursed business mileage on their federal return under current rules, which is why many rely on employer reimbursement programs instead. If your employer reimburses you at or below the standard rate under an accountable plan, that reimbursement typically isn't taxable to you.

Records are everything

The single most common reason mileage deductions get denied is poor documentation. The IRS expects a contemporaneous log — one you keep as you go, not one you reconstruct from memory the night before filing. For each business trip, your records should capture:

  • The date of the trip
  • Your starting point and destination
  • The business purpose of the trip
  • The miles driven

You'll also want your total annual mileage so you can calculate the business-use percentage of your vehicle. A notebook in the glovebox works, but it's easy to forget entries; a dedicated tool that logs trips automatically saves you from that gap. This is where an app like Rienly earns its keep — it tracks your mileage and keeps an eye on your vehicle's maintenance schedule at the same time, so your records stay complete without you having to think about them.

Common mistakes to avoid

  • Claiming your commute. The daily drive to a regular workplace is off-limits, full stop.
  • Counting personal errands as business. Stopping for groceries on the way home doesn't convert a commute into a business trip.
  • Mixing methods improperly. Decide between the standard rate and actual expenses and apply the rules consistently.
  • Skipping the log. Without a mileage record, even legitimate business miles can be disallowed.
  • Forgetting tolls and parking. These are deductible on top of your mileage and are easy to overlook.

Putting it into practice

Start by drawing a clear line between your commute and your business driving. If you work from a qualifying home office, recognize that trips from home to conduct business likely count in your favor. Pick the deduction method that fits your vehicle and your appetite for record-keeping, and then commit to logging every business trip as it happens.

The tax code doesn't reward the miles you drive so much as the miles you can prove. Track them consistently, categorize them honestly, and the deduction takes care of itself when filing season arrives.