About the Mileage Deduction
Driving for business adds up fast in wear, gas, and depreciation, and the IRS lets you deduct it without tracking every individual expense. Our Mileage Deduction Calculator applies the standard mileage rate to your business miles for a quick estimate.
How It Works
The calculator multiplies your entered business miles by the IRS standard mileage rate, converting the per-mile cents figure into dollars. The result is your estimated deduction using the standard mileage method, one of two ways the IRS allows vehicle expenses to be deducted.
Formula & Methodology
The standard mileage rate is set annually by the IRS to approximate the average per-mile cost of operating a vehicle, bundling together gas, maintenance, insurance, and depreciation into a single figure so you don't have to track each expense category separately. Because the rate already accounts for depreciation, you can't also separately deduct depreciation or claim it on top of standard mileage for the same vehicle in the same year. The alternative is the actual expense method, which requires tracking every real cost (gas, repairs, insurance, depreciation, lease payments) and multiplying the total by your business-use percentage, generally worth it only when actual costs are unusually high relative to miles driven.
Step-by-Step: Calculating It By Hand
- 1Track total business miles driven for the year using a mileage log or app (date, purpose, and distance for each trip).
- 2Confirm the current year's IRS standard mileage rate, since it's adjusted annually and sometimes mid-year.
- 3Multiply total business miles by the rate (in dollars per mile) to get the deduction.
- 4Compare against the actual expense method if your real vehicle costs are unusually high, since it can occasionally produce a larger deduction.
Examples
Moderate mileage
5,000 business miles at 67 cents per mile → a $3,350 deduction.
Heavy business driver
15,000 business miles at the same rate → a $10,050 deduction, showing how quickly this adds up for delivery drivers, sales reps, or contractors.
Advantages
- No need to track individual gas, repair, or insurance receipts
- Fast, predictable calculation using a single published rate
- Easy to verify against a simple mileage log
- Works well for most vehicles with moderate business use
Common Mistakes
- Using an outdated mileage rate from a prior year instead of the current one
- Deducting commuting miles, which generally don't qualify as business mileage
- Not keeping a contemporaneous mileage log, which the IRS expects to substantiate the deduction
- Trying to deduct both standard mileage and actual expenses like depreciation for the same vehicle and year
Edge Cases to Watch For
- You must choose either the standard mileage rate or the actual expense method for a given vehicle in a given year, not a mix of both.
- Commuting miles between home and a regular workplace generally don't count as deductible business mileage, only trips beyond a normal commute.
- If you want to use the standard mileage rate, you generally must choose it in the first year the vehicle is used for business - switching from actual expenses to standard mileage later can be restricted.
- The rate itself changes almost every year, and occasionally mid-year, so a deduction calculated with an outdated rate can meaningfully understate or overstate the real figure.
Common Use Cases
- Estimating a deduction for a delivery driver, rideshare driver, or sales rep's business vehicle use
- Comparing the standard mileage method against tracking actual vehicle expenses
- Planning quarterly estimated tax payments with vehicle deductions factored in
- Reconciling a mileage log against a deduction claimed on Schedule C