If you drive for work, those miles are money — but only if you can prove them. The IRS lets self-employed people, business owners, and certain employees deduct the cost of business driving, yet a deduction is only as strong as the records behind it. A shoebox of vague estimates won't survive scrutiny; a clean, contemporaneous log will. Here's how to track your mileage properly so you claim everything you're entitled to and keep the paperwork the IRS actually wants to see.

First, Confirm You Qualify

Not every mile you drive counts. Before you start logging, make sure your driving is genuinely deductible. Business mileage generally includes trips between work locations, visits to clients or customers, travel to temporary work sites, and errands like picking up supplies or heading to the bank for business purposes.

What almost never qualifies is your regular commute — the drive from home to your primary workplace is considered personal, no matter how far it is. Self-employed individuals and small business owners have the most straightforward path to the deduction, while employees face tighter restrictions after recent tax-law changes. If you're unsure where your situation falls, it's worth confirming before you spend a year tracking.

Choose Your Calculation Method

The IRS gives you two ways to turn miles into a deduction, and the method you pick shapes what you need to record.

  • Standard mileage rate: You multiply your total business miles by the IRS's per-mile rate for the year. It's simple, it covers fuel, wear, and depreciation in one number, and it requires the least documentation beyond your mileage log itself.
  • Actual expense method: You track the real costs of operating your vehicle — gas, insurance, repairs, maintenance, depreciation — and deduct the business-use percentage of those totals. This can yield a larger deduction for expensive vehicles, but it demands receipts and far more record-keeping.

Whichever route you choose, you still need mileage figures. The standard rate needs your business miles; the actual method needs your business-use percentage, which comes from comparing business miles to total miles. So mileage tracking is unavoidable either way.

Record Your Odometer at the Start of the Year

The foundation of any mileage record is your total distance driven, and that begins with a single number: your odometer reading on January 1 (or the day you start using the vehicle for business). Write it down. At the end of the tax year, record it again. The difference is your total annual mileage, which you'll split between business and personal use.

This total-miles figure matters even if you use the standard rate, because the IRS may want to see that your claimed business miles are a plausible fraction of your overall driving. If you say you drove 30,000 business miles but your car only accumulated 25,000 total, the numbers won't add up.

What Every Trip Log Needs

A driving log is the heart of the whole system, and the IRS is specific about what each entry should contain. For every business trip, capture:

  • The date of the trip
  • The starting and ending odometer readings (or at least the total miles driven)
  • The destination — where you went
  • The business purpose — why the trip was necessary

That last item is the one people forget, and it's often what gets a deduction disallowed. "Meeting with client Smith to review contract" is defensible; "drove around" is not. The more specific your purpose, the harder your log is to challenge.

Keep It Contemporaneous

The single most important habit is recording trips as they happen, or very close to it. The IRS strongly favors logs kept contemporaneously — meaning written down at the time — over numbers reconstructed months later from memory or calendar guesswork. A log you fill in every day carries far more weight than one you cobble together the week before you file. Reconstructed logs can be challenged and thrown out, taking your deduction with them.

Digital vs. Paper Logs

The IRS accepts both handwritten paper logs and digital records, so the choice comes down to what you'll actually stick with. A paper logbook kept in the glove compartment works if you're disciplined about filling it in after every trip. The risk is human: forgotten entries, lost notebooks, and the temptation to "catch up" later.

Digital logs are generally preferred because they're harder to lose, easy to back up, and can timestamp entries automatically. Mileage tracker apps go a step further — many use GPS to detect trips automatically, calculate distances, and let you swipe to classify each drive as business or personal. That automation removes the biggest failure point, which is simply forgetting to log a trip. An app like Rienly can handle the mileage tracking while also keeping tabs on your vehicle's maintenance schedule, so the same records that support your deduction also help you look after the car.

Whatever tool you use, make sure it captures the four required fields and lets you export a clean report at tax time.

Build a System You'll Actually Follow

The best tracking method is the one you don't have to think about. Tax time becomes stress-free only when the logging happens consistently throughout the year, not in a panic every April. A few practical habits make that possible:

  1. Log immediately. Whether by app or notebook, record the trip before you get distracted by the next task.
  2. Separate business and personal early. Classify each trip as it happens so you never have to reconstruct intent later.
  3. Photograph your odometer at the start and end of the year as time-stamped proof of your totals.
  4. Back up digital records and keep receipts if you use the actual expense method.
  5. Review monthly. A quick monthly check catches gaps while your memory is still fresh.

Keep Your Records Long Enough

Filing your return isn't the end of the job. The IRS can review past returns for several years, so hold onto your mileage logs and any supporting receipts well after you file. Digital backups make this painless — a folder of exported reports and odometer photos takes up almost no space and turns a potential audit headache into a five-minute retrieval.

The Bottom Line

Tracking mileage for tax deductions comes down to three principles: confirm the miles qualify, record each trip with the date, distance, destination, and purpose, and do it consistently rather than from memory. Pick the calculation method that fits your vehicle and your appetite for paperwork, capture your odometer at both ends of the year, and lean on a digital tool if consistency is your weak spot. Do that, and every deductible mile you drive turns into a legitimate, defensible deduction — with a paper trail solid enough to back it up.