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Mileage guide

How Long Should You Keep Mileage Logs?

By FlatMile ·

General US federal recordkeeping information, not individual tax advice. Tax treatment depends on your circumstances; consult a qualified adviser for your claim.

At a glance

For many federal income-tax records, the IRS says to keep supporting records for three years from the date you file the return that claims the deduction. Mileage records can need to be kept longer when they support a vehicle’s business use during its depreciation recovery period, or when another record-retention rule applies. Treat three years as a general rule, not a universal deadline for every mileage log.

This guide covers US federal records. State rules, an employer’s reimbursement policy, open examinations, amended returns, and your vehicle’s tax history can affect what you should retain. If you are unsure whether an older log supports a later tax year, ask a tax professional before deleting it.

The general three-year rule

IRS Publication 463 says records supporting a deduction generally should be kept for three years from the date the return claiming it is filed. A return filed early is treated as filed on its due date. The IRS’s recordkeeping overview explains that the period can differ based on the tax issue. For example, different rules can apply if income is omitted, a refund claim is filed, or no return is filed.

Keep the log with the return records for the year it supports. If you amend a return or receive a question from the IRS, preserve the relevant mileage and supporting documents while the matter is open. Do not use a general retention chart to dispose of records connected to an active examination or dispute.

Vehicle records may have a longer life

Publication 463 separately says taxpayers must keep records of a car’s business use for each year of its recovery period. That matters because vehicle records can support depreciation and business-use calculations over several tax years. A log for one year may therefore be relevant to later years, even after the ordinary three-year period for that return has passed.

Keep mileage logs alongside information that helps explain the vehicle’s tax treatment, such as annual total miles, business-use percentage, vehicle purchase or lease information, depreciation records, and method choices. A mileage app’s trip list may not contain all of those facts. A saved export can also be hard to interpret later if it lacks the date range, vehicle identity, business-purpose notes, or unit of distance.

As a practical recordkeeping habit—not an IRS guarantee—retain the annual log and vehicle-use records for as long as they support a vehicle’s tax basis, depreciation, or business-use calculation. Keep reimbursement records for the period required by your employer or reimbursement plan. Longer retention can be sensible where the records support later calculations; your tax adviser can set a schedule for your circumstances.

Make retained records usable

Preserving a file is only useful if you can still read it and connect it to the return. At year end, save a copy of the log and related receipts or work records. Include the tax year, vehicle, distance unit, totals, and a note explaining any corrections. Keep a second copy in a secure location separate from your phone, and periodically confirm that the file opens.

For digital records, retain the original export where possible. If you convert a file to another format, keep both copies and check that the dates, trip purposes, miles, and totals match. Protect client or patient details; retain only information needed to substantiate the business purpose and follow privacy obligations that apply to your work.

For a self-employed driver, an end-of-year file might include:

  • A trip log with date, destination, business purpose, and miles.
  • Beginning and ending odometer readings or other support for total annual miles.
  • Receipts for separately claimed business costs, where applicable.
  • A copy of the filed return and any vehicle depreciation or method-election records.

The IRS recommends making records at or near the time of the trip; a weekly log can be timely if it accounts for the week’s use. See Publication 463 for car-record requirements and the broader IRS recordkeeping overview.

FlatMile provides free automatic and manual drive logging. A subscription or eligible trial unlocks captured-drive details, business/personal classification, and PDF and CSV exports. The reports are neutral records, not IRS-approved or audit-proof documents. Drivers should review the log and retain copies in the way that fits their tax and business records. You can view the fictional sample report to see the export layout.

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