What you need to know
The IRS requires four pieces of information for every business trip: the date, your destination, the business purpose, and the miles driven. Under IRS Publication 463, your records must be "contemporaneous" — created at or near the time of each trip, not reconstructed months later from memory. You must also log your odometer reading at the start and end of the tax year. The 2026 standard mileage rate is 72.5¢/mile. This free generator captures every required field in an IRS-ready PDF format that holds up under audit.
Quick tips for irs mileage log requirements (2026)
- Four required fields per trip: date, destination, business purpose, miles driven
- Record odometer reading on January 1 and December 31 each year
- Records must be contemporaneous (kept at or near the time of each trip)
- IRS Publication 463 governs vehicle expense recordkeeping rules
- Reconstructed or estimated logs are commonly rejected during audits
- Keep records 3 years from filing date (6 years if income under-reported)
- You cannot deduct commuting miles (home to regular workplace)
- Standard mileage (72.5¢) vs actual expenses — pick one method per vehicle
The Four Fields the IRS Requires
Every entry in your mileage log must contain four specific data points, and missing any one of them can invalidate the deduction for that trip. These are: the date of the trip, your destination (where you drove), the business purpose (why the trip was necessary for your work), and the number of miles driven.
The business purpose is the field most people get wrong. "Work" or "business" is not specific enough. The IRS wants to see something like "client meeting at 123 Main St" or "property showing for buyer" or "delivery route - downtown zone." The purpose should make clear that the trip was ordinary and necessary for your trade or business.
Beyond the per-trip data, you must also record your vehicle's odometer reading on the first and last day of the tax year. This establishes your total annual mileage, which the IRS uses to verify your business-use percentage. Without start and end odometer readings, an auditor cannot confirm what fraction of your driving was for business.
What "Contemporaneous" Really Means
The single most important rule in IRS Publication 463 is that your records must be contemporaneous. This means you record each trip at or near the time it happens — the same day, or at worst within the same week. A log you build from memory or from calendar reconstruction at tax time is far weaker evidence and is frequently thrown out during audits.
The IRS allows what it calls "adequate records" or "sufficient evidence to support your own statement." A contemporaneous mileage log is the gold standard for adequate records. If you wait until April to recreate a year of driving, you no longer have a contemporaneous record, and the burden of proof shifts heavily against you.
This is exactly why a simple tool you can open daily matters. Logging three or four trips at the end of each workday takes two minutes and produces an unimpeachable record. Trying to remember 600 trips in April produces a guess.
Standard Mileage Rate vs Actual Expenses
The IRS gives you two methods to deduct vehicle costs. The standard mileage method multiplies your business miles by a fixed rate (72.5¢ for 2026), and that single number covers gas, maintenance, insurance, and depreciation. The actual expense method requires you to track every receipt — fuel, repairs, insurance premiums, lease payments — and deduct the business-use percentage.
For most self-employed people and gig workers, the standard mileage method wins. It is simpler, requires only a mileage log instead of a shoebox of receipts, and often produces a larger deduction for fuel-efficient vehicles. The actual expense method tends to win only for expensive vehicles with high operating costs.
Important: if you want to use the standard mileage rate, you must choose it in the first year you use the car for business. You can switch to actual expenses later, but if you start with actual expenses (and claim accelerated depreciation), you are generally locked out of the standard rate for that vehicle.
Surviving a Mileage Audit
Vehicle deductions are one of the most commonly audited items on Schedule C because they are easy to inflate. If the IRS questions your mileage, they will ask for your log. A complete, contemporaneous log with all four required fields plus odometer readings almost always satisfies the examiner.
Supporting evidence strengthens your position further: appointment calendars, client invoices, delivery platform earnings summaries, and gas receipts that corroborate your driving patterns. If you drive for DoorDash or Uber, your platform trip history is excellent backup. If you are a realtor, your MLS showing records line up with your log.
The trips that draw scrutiny are the round-number estimates ("about 10,000 miles") and the suspiciously consistent entries ("exactly 50 miles every single day"). Real driving is irregular. A log that reflects genuine day-to-day variation is far more credible than one that looks manufactured.
How this generator helps
Most mileage trackers force you to download an app, create an account, or pay a subscription. This generator does none of that. Enter your trips above, click "Generate IRS-Ready PDF," and download a properly formatted log in seconds. Your data stays in your browser between sessions, so you can come back and add more trips throughout the year.
What goes in the PDF
The generated PDF includes everything the IRS requires: date, start location, end location, purpose, miles driven, and trip type. It also includes your odometer readings (if entered), a calculated tax deduction summary, and a clean header showing your name and vehicle. Print it, email it to your CPA, or upload it to TurboTax — it is ready for tax filing as-is.