What Is a Mileage Log and Why You Need OneA mileage log is a written or digital record of the trips you drive for a specific purpose, typically including the date, starting and ending odometer readings or total miles, the destination, and the reason for the trip. The IRS and most employers require this kind of contemporaneous record to support any mileage based deduction or reimbursement claim.What a Good Mileage Log Actually IncludesAt minimum, record the date, the purpose of the trip, the starting and ending location or odometer reading, and the total miles driven. A short note about the specific business, medical, or charitable context can also help if the trip is ever questioned later, since a log entry that simply says drove somewhere is far less useful than one that says client meeting at downtown office, 18 miles round trip.A Simple Notebook vs a Tracking AppA small notebook kept in the car or a basic phone note works perfectly well for most people and costs nothing beyond a few seconds per trip.
A dedicated mileage tracking app can save time by using GPS to log trips automatically, which is especially useful for anyone making many short trips a day, like a delivery driver or a sales rep, though it usually comes with a subscription cost a simpler manual log avoids entirely.Why I Will Remember Later Does Not WorkReconstructing a full year of trips from memory in April is unreliable and tends to understate real mileage, since plenty of small, routine trips simply get forgotten by the time tax season arrives. A quick note logged at the time of each trip, even something as simple as a phone note, holds up far better if a deduction or reimbursement is ever questioned, and takes only seconds compared to the hours a year end reconstruction usually demands. Once you have a running total, the Mileage Reimbursement Calculator turns those logged miles into a dollar figure in moments.Have a running mileage total ready?
Turn it into a dollar figure with the Mileage Reimbursement Calculator.
Frequently Asked Questions
Does a mileage log need to be on paper, or can it be digital?
Either format is generally acceptable as long as the record is accurate, detailed, and kept close to the time the trip actually happened rather than reconstructed much later.
What happens if I do not have a mileage log during an audit?
Without adequate records, a claimed deduction or reimbursement may be disallowed or reduced, which is exactly why keeping even a simple ongoing log is worth the small effort it takes.
Can I keep one combined log for business, medical, and charitable miles?
Yes, as long as each entry clearly identifies which category the trip belongs to, since each type uses a different IRS rate and different qualifying rules.
How often should I update a mileage log?
Ideally after each qualifying trip, or at minimum once a week, since waiting longer increases the chance of forgetting details or entire trips altogether.