Mileage Log Guide 2026: IRS Requirements, Tax Deductions & Reimbursements

A mileage log is a record used to document vehicle trips and separate business driving from personal driving.

A typical business mileage log includes:

Mileage logs may be kept manually in a notebook or spreadsheet or automatically using an automatic mileage tracker.

For people who drive frequently for work, automatic mileage tracking can reduce the risk of forgetting trips and having to reconstruct mileage months later.

The IRS expects taxpayers claiming vehicle-related business expenses to maintain adequate records.

For car expenses, IRS Publication 463 provides guidance on documenting business vehicle use, including information such as the date of vehicle use, mileage for each business use, business destination, business purpose, and total vehicle mileage for the year.

The timing of the record also matters.

The IRS made an unusual midyear adjustment to mileage rates in 2026.

You can check the latest figures directly on the IRS Standard Mileage Rates page.

On July 1, 2026, the updated rates went into effect.

That makes accurate trip dates especially important for 2026 mileage logs. A business trip taken in May and a trip taken in September may be calculated using different mileage rates.

For instance, using the standard mileage rate, 1,000 qualifying business miles driven in the first half of 2026 would result in $725. After July 1, an additional 1,000 qualifying miles would earn $760.

The IRS standard mileage method is optional. Subject to applicable regulations, eligible taxpayers may instead utilise the actual vehicle expense method.

Self-employed professionals and business owners may be able to deduct qualifying business vehicle expenses.

Common examples of business driving can include trips to:

However, your normal commute between your home and your regular workplace is generally considered personal commuting mileage rather than deductible business mileage.

This distinction is one reason properly classifying each trip is as important as recording the mileage itself.

The vast majority of workers are similarly incapable of directly subtracting unreimbursed business mileage on their federal tax filings. The existing IRS regulations restrict deductions for unreimbursed travel expenses incurred by employees, with specific exemptions for certain eligible taxpayers. Additional rules can be reviewed in applicable IRS guidance on employee business expenses.

Mileage logs are also commonly used when employees drive their personal vehicles for work and submit mileage to an employer for reimbursement.

Under an IRS accountable-plan arrangement, reimbursements generally need a business connection, adequate accounting by the employee, and the return of excess reimbursement within a reasonable period.

The IRS mileage rate does not automatically mean every private employer must reimburse employees at that exact rate.

Correctly identifying business mileage helps keep a mileage log accurate.

Special rules can apply when your home qualifies as your principal place of business, when traveling to temporary work locations, or in other situations.

A mileage log can be maintained manually, but manual tracking requires you to remember every qualifying drive.

An automatic mileage tracker such as DriverAI can record trips in the background and help organize driving into categories such as business and personal mileage.

DriverAI's DriverAI's mileage tracking tools can record trip dates, locations, distances, routes, and trip purposes and can generate reports that can be exported for tax preparation, accounting, or reimbursement workflows. can record trip dates, locations, distances, routes, and trip purposes and can generate reports that can be exported for tax preparation, accounting, or reimbursement workflows.

Businesses may also choose to retain mileage records longer because of accounting, reimbursement, audit, or internal recordkeeping requirements.

Digital mileage logs can make long-term storage easier because reports can be exported and retained with other tax documentation.

An accurate mileage log can make tax preparation, mileage reimbursement, and expense reporting considerably easier.

Instead of trying to remember where you drove months later, tracking trips throughout the year creates a clearer record of your business travel.

With DriverAI, drivers can automatically track trips, classify mileage, review driving history, and create mileage reports from one place, helping turn everyday driving into an organized mileage record ready for tax season or reimbursement reporting.