Mileage Deduction Calculator — IRS standard mileage rates

A mileage deduction calculator takes the guesswork out of one of the most commonly missed tax breaks for the self-employed, gig workers, and small business owners: the miles you drive for work. Instead of tracking receipts for gas, oil changes, tires, and depreciation, the IRS lets most taxpayers use a flat per-mile rate that's designed to approximate the true cost of operating a vehicle — and multiplying that rate by your logged miles is usually the fastest way to a legitimate deduction.

Arb Digital builds calculators like this one because so many freelancers, delivery drivers, real estate agents, and consultants we work with underestimate how much their vehicle costs them at tax time. A driver logging 12,000 business miles a year at the 2025 illustrative rate is looking at a deduction well into the thousands of dollars — money that's easy to lose entirely if the mileage log doesn't exist.

What This Mileage Deduction Calculator Does

You enter your business miles and the standard mileage rate you're using, plus any charitable or medical/moving miles you drove during the year (each of which has its own separate IRS rate), and your marginal tax rate. The calculator multiplies each mileage category by its rate to produce a deduction amount, totals everything into one number, and estimates the actual tax dollars that deduction could save you at your bracket. Because the rate fields are editable, you can update them the moment the IRS publishes a new annual rate, or model prior tax years by entering that year's published figure.

How to Use It

1. Enter your business miles. This should come from a contemporaneous mileage log — a notebook, spreadsheet, or mileage-tracking app — not an estimate made in April.
2. Confirm the business rate. The field defaults to a 2025 illustrative figure; check the current year's IRS rate before filing.
3. Add charity or medical/moving miles if applicable — these use separate, lower statutory rates and different deduction rules than business mileage.
4. Enter your marginal tax rate so the calculator can estimate real dollar savings, not just the deduction amount.
5. Click Calculate to see your total deduction and category breakdown update instantly.

The Formula / How It's Calculated

The math behind the standard mileage method is deliberately simple: Deduction = Miles Driven × Applicable Rate. Business, charitable, and medical/moving mileage each use a different rate set by the IRS, and the business rate is adjusted most years to reflect changes in fuel and vehicle operating costs, while the charitable rate is fixed by statute and rarely changes. Once you know your total deduction, your estimated tax savings is approximately Deduction × Marginal Tax Rate — though in practice only the business-mileage portion reduces self-employment tax as well as income tax, while charitable and medical mileage only matter if you itemize deductions and clear the relevant thresholds.

Standard Mileage vs. Actual Expenses

The IRS gives you two ways to deduct vehicle costs, and you generally have to pick one for a given vehicle each year. The standard mileage method — what this calculator uses — applies a flat rate per mile that's meant to bundle gas, maintenance, insurance, and depreciation into a single number. The actual expense method instead has you total every real cost of operating the vehicle (fuel, repairs, insurance, lease payments or depreciation, registration) and then deduct the business-use percentage of that total. Actual expenses tend to win for newer, more expensive, or higher-maintenance vehicles, while standard mileage tends to win for efficient, lower-cost vehicles driven a lot for work. There's an important catch: if you want to use standard mileage, you generally must choose it in the first year you use the vehicle for business — switching from actual expenses to standard mileage later is restricted, especially if you've claimed accelerated depreciation. Run both methods once at the start of a tax year using rough numbers to see which direction makes sense before committing.

The Logging Rules That Make a Mileage Deduction Stick

Mileage deductions are among the most commonly disallowed items in an audit, almost always because of poor recordkeeping rather than ineligible driving. The IRS expects a contemporaneous log — meaning records created at or near the time of the trip, not reconstructed from memory later — that shows the date, destination, business purpose, and miles driven for each trip. A simple spreadsheet with those four columns, updated weekly, is enough. Mileage-tracking apps that use phone GPS to auto-log trips make this nearly effortless and are worth adopting if you drive for work regularly. What doesn't hold up: an odometer reading at the start and end of the year with no trip-level detail, or a lump "I drove about 10,000 miles for work" estimate. Commuting from home to a regular place of business is never deductible business mileage — the deduction only applies to miles driven between work locations, to client meetings, for supply runs, or similar business purposes after that initial commute.

Who Can Actually Claim Mileage

Since the 2018 tax law changes, unreimbursed employee business expenses — including mileage an employee drives for a W-2 job but isn't reimbursed for — are no longer deductible on most federal returns. This deduction is now primarily available to self-employed individuals, independent contractors, gig workers, and small business owners filing a Schedule C, plus certain statutory employees. If your employer reimburses mileage at or below the IRS rate, that reimbursement is typically tax-free to you but isn't separately deductible. Always check whether your state follows the same federal rules, since a handful of states still allow employee mileage deductions on the state return even though the federal deduction was suspended.

Mixing Personal and Business Use of the Same Vehicle

Most self-employed people don't own a dedicated business vehicle — they use the same car for client visits, errands, and picking up groceries. That's completely fine for the standard mileage method, as long as your log separates business trips from personal ones. What trips up filers is the reverse assumption: that owning a car "mostly for work" lets you deduct all of it. The IRS only allows you to deduct the specific miles that were actually driven for business purposes, trip by trip, not a percentage guess applied to your annual odometer total. If you switch vehicles mid-year — trading in an old car for a new one — keep separate logs for each vehicle and total them at filing time, since a change in vehicle can also affect which deduction method you're eligible to use going forward if you'd previously claimed actual expenses and depreciation on the old one.

Multiple Business Locations and Trip Structuring

If you work from a home office that qualifies as your principal place of business, the mileage rules shift in your favor: trips from that home office to any other work location — a client's office, a job site, a supply store — become deductible business mileage, even though a similar trip from a traditional commute starting point wouldn't count. This is one of the more overlooked interactions between the home office deduction and the mileage deduction, and it's worth understanding if you run a service business where you're frequently on the road. Contractors, real estate agents, home-service providers, and consultants who structure their day starting from a qualifying home office rather than driving to a separate rented office first can often capture significantly more deductible mileage over a year, simply because more of the day counts as business travel from the first mile.

Common Mistakes to Avoid

• Estimating miles instead of logging them. Reconstructed logs are the single biggest reason mileage deductions get disallowed on audit.
• Deducting your regular commute. Miles from home to your main workplace are personal, not business, even if you're self-employed.
• Mixing standard mileage and actual expenses for the same vehicle in the same year. You must choose one method per vehicle per year.
• Using last year's rate. The IRS business mileage rate typically changes annually — confirm the current figure before filing.
• Forgetting charitable and medical mileage entirely. These are smaller but still real deductions if you itemize and meet the thresholds.

Related Free Tools From Arb Digital

If you're self-employed, mileage is usually just one line on a much bigger tax picture. Pair this calculator with our self-employment tax calculator and 1099 tax calculator to estimate your full tax liability, our home office deduction calculator if you also work from home, and our standard vs. itemized deduction calculator to see whether your charitable or medical mileage even clears the itemizing threshold. Explore every calculator on our free online tools hub.

Frequently Asked Questions

This tool provides general estimates for educational purposes only and is not financial, tax, legal, or medical advice. Figures are illustrative; consult a licensed professional for decisions.