IRS Approved Mileage Log: What It Looks Like and Why You Need One

If you drive for business, you may be eligible for a mileage deduction on your taxes. But to claim it, you’ll need an IRS approved mileage log. This isn't just a suggestion—it’s a requirement if you want to avoid trouble during a potential audit.

What Is an IRS Approved Mileage Log?

An IRS approved mileage log is a detailed record of your vehicle use that meets the Internal Revenue Service's standards for mileage deduction documentation. It should be kept contemporaneously—that means logging each trip as it happens, not months later.

What Should Be Included?

To qualify, your mileage log must contain:

Date of the trip

Starting point and destination

Purpose of the trip (must be business-related)

Odometer readings (start and end) or total miles driven

Each of these elements is crucial. If even one is missing, the IRS could deny your deduction.

Paper or Digital?

Both are acceptable. A notebook, spreadsheet, or mileage tracking app can all be used—as long as they include the required details. Digital apps like MileIQ or TripLog are especially helpful because they automate most of the process and create IRS-ready reports.

Common Mistakes to Avoid

Logging personal or commuting miles

Rounding numbers instead of using actual odometer readings

Failing to log trips immediately

Omitting the business purpose

Final Word

Keeping an  IRS approved mileage log takes a bit of discipline, but it can result in substantial tax savings. It’s one of the easiest ways for small business owners, gig workers, and freelancers to reduce taxable income—legally and safely.