A mileage tracker for taxes is a running log of every deductible trip you take, and the IRS requires five things for each entry: the date, the destination, the business or other qualifying purpose, your odometer readings, and the miles driven. Get those five in writing at the time of the trip, and you can multiply your qualifying miles by the IRS rate at filing time. For 2026, business miles are worth 72.5 cents each, medical miles 20.5 cents, and charitable miles 14 cents.1Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile Skip the log and you lose the deduction, no matter how many miles you actually drove.
What Every Trip Entry Must Contain
Federal tax law requires you to substantiate travel expenses with records showing amount, time and place, and business purpose.2Office of the Law Revision Counsel. 26 US Code 274 – Disallowance of Certain Entertainment, Etc., Expenses IRS Publication 463 turns that into five concrete fields for every trip:
- Date. The day the trip happened, so the expense lands in the right tax year.
- Destination. The specific city, town, or address, not a vague reference like “downtown.”
- Business purpose. Why you drove: “client consultation with Smith Corp,” “dental appointment,” “meal delivery for food bank.”
- Odometer readings. Starting and ending numbers for the trip.
- Miles driven. The total, calculated from those readings.
If you plan to use the standard mileage rate, also record your vehicle’s total odometer reading on January 1 and December 31. That year-end pair lets the IRS check your business-use ratio against total annual miles.3Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
Timing matters as much as content. The IRS puts significant weight on whether records were made at or near the time of travel. A log built from memory months later is far weaker than same-day entries, and this is where most mileage deductions collapse in an audit: sporadic tracking, then a backfill before filing. Agents recognize the pattern.
Which Trips You Can Log
Three categories of driving are deductible, each with its own rate and its own rules. Categorize every trip as you enter it. A pile of uncategorized miles at year end is nearly as bad as no log.
Business Trips
Business miles cover travel between two work locations, trips from your office to a client, bank runs for business deposits, supply pickups, and similar errands with a clear business purpose. They do not cover commuting. The daily drive between home and your regular workplace is personal, regardless of distance or whether you take work calls on the way.3Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
Two exceptions matter for anyone working from home. If your home office qualifies as your principal place of business, driving from there to another work location in the same trade or business counts as deductible business mileage. Travel from home to a temporary work site, meaning one where you expect to work less than a year, is also deductible even without a home office.3Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
Medical Trips
Driving to receive medical care qualifies: doctors, dentists, physical therapy, pharmacy runs for prescriptions, and similar healthcare travel. The 2026 rate is 20.5 cents per mile. Medical expenses, including mileage, are deductible on Schedule A only to the extent they exceed 7.5% of your adjusted gross income.4Internal Revenue Service. Topic No. 502, Medical and Dental Expenses For someone earning $60,000, the first $4,500 in medical costs produces zero deduction. Unless you had a heavy medical year, tracking these miles alone rarely clears the floor.
Charitable Trips
Driving to volunteer for a 501(c)(3), such as meal delivery, staffing an event, or transporting supplies, qualifies at 14 cents per mile. That rate is written into the tax code and hasn’t changed in decades; Congress would need to pass legislation to move it.5Office of the Law Revision Counsel. 26 USC 170 – Charitable, Etc., Contributions and Gifts Charitable mileage is claimed on Schedule A, so it only helps if you itemize.
Paper, Spreadsheet, or App
The IRS doesn’t mandate a format. Any method works as long as the five required fields are captured for every trip.
A paper notebook kept in the vehicle is the simplest option. You write down the date, destination, purpose, and odometer readings after each trip. The weakness is discipline. Miss a few days and the gaps are hard to fill accurately.
Spreadsheets in Excel or Google Sheets add math. Formulas can total miles and multiply by the applicable rate automatically, but you still enter each trip’s raw data by hand. The spreadsheet calculates; it doesn’t record.
GPS-based mobile apps do the recording for you. They detect when the vehicle is moving, log start and end points through your phone’s location services, and let you classify each trip with a swipe. Most produce IRS-ready reports containing every required data point, and cloud backups protect against a lost phone. Apps typically charge a subscription, and you still have to categorize trips promptly for the log to be usable.
Turning Miles Into a Deduction
Once the miles are logged, you choose one of two IRS methods to convert them into dollars.
Standard Mileage Rate
Multiply your qualifying miles by the applicable 2026 rate: 72.5 cents for business, 20.5 cents for medical or qualifying military moves, 14 cents for charitable. The standard rate is designed to cover every operating cost in one figure, including fuel, insurance, maintenance, and depreciation.1Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile A self-employed consultant with 15,000 business miles in 2026 claims $10,875 without keeping a single gas receipt.
Actual Expense Method
The alternative totals every vehicle cost for the year (fuel, oil, tires, insurance, registration, repairs, lease payments or depreciation) and multiplies by your business-use percentage. That percentage is business miles divided by total miles.6Internal Revenue Service. Topic No. 510, Business Use of Car Drive 20,000 miles with 12,000 for business, and you deduct 60% of your total vehicle costs. It requires receipts for everything but can produce a larger deduction for expensive vehicles, heavy repairs, or steep depreciation.
The First-Year Lock-In
You must use the standard mileage rate in the first year a vehicle is available for business if you ever want to use it for that vehicle. Claim actual expenses in year one, and you’re locked into actual expenses for that vehicle’s life. Start with the standard rate, and you can switch to actual expenses later.6Internal Revenue Service. Topic No. 510, Business Use of Car For leased vehicles the rule is stricter: choose the standard rate, and you must use it for the entire lease including renewals. Run the numbers both ways before committing in year one.
Where the Deduction Goes on Your Return
Placement depends on how the miles were earned:
- Self-employed and independent contractors report business mileage on Schedule C (Form 1040), Line 9, with vehicle details in Part IV or on Form 4562.7Internal Revenue Service. Schedule C (Form 1040) – Profit or Loss From Business
- Medical mileage goes on Schedule A as part of medical expenses, subject to the 7.5% AGI floor.4Internal Revenue Service. Topic No. 502, Medical and Dental Expenses
- Charitable mileage goes on Schedule A as a charitable contribution.
- Armed Forces reservists, fee-basis state or local officials, and qualified performing artists file Form 2106 and carry the deduction to Schedule 1 as an adjustment to income.8Internal Revenue Service. Internal Revenue Service Notice 2024-08 – 2024 Standard Mileage Rates
Because medical and charitable mileage both flow through Schedule A, they help only if you itemize. If you take the standard deduction, tracking those two categories produces no benefit.
A Note for W-2 Employees
Most employees can’t deduct unreimbursed mileage right now. The Tax Cuts and Jobs Act suspended the itemized deduction for miscellaneous employee expenses for tax years 2018 through 2025.9Congressional Research Service. Expiring Provisions in the Tax Cuts and Jobs Act (TCJA, P.L. 115-97) The suspension was scheduled to expire after December 31, 2025, which would restore the deduction for 2026 subject to a 2% AGI floor, but 2025 legislation proposed making the repeal permanent. Check whether Congress restored the deduction before relying on a mileage tracker for a 2026 employee return. The narrow employee categories listed above (reservists, fee-basis officials, performing artists, and employees with impairment-related work expenses) remain able to deduct unreimbursed vehicle costs.10Internal Revenue Service. Instructions for Form 2106
How Long to Keep the Log
Keep your mileage tracker and supporting documents for at least three years from the date you filed the return claiming the deduction. That window aligns with the general statute of limitations for IRS audits.11Internal Revenue Service. How Long Should I Keep Records A complete, organized log with dates, destinations, purposes, and miles for every trip usually resolves an inquiry quickly. A messy or partial log invites deeper scrutiny.
If you can’t produce adequate records, the IRS can disallow the deduction entirely and assess back taxes plus interest. The accuracy-related penalty for negligence adds another 20% of the underpayment.12Internal Revenue Service. Accuracy-Related Penalty On a $10,000 mileage deduction claimed without documentation, that penalty alone can run into four figures. Keeping the log in real time is far cheaper than trying to reconstruct one during an audit.