A mileage log for IRS purposes is essential for anyone claiming vehicle-related deductions on their tax return. Whether you’re self-employed, a small business owner, or an employee who drives for work, the IRS requires detailed records to verify your mileage claims. An mileage log irs log should include the date of each trip, purpose of the travel, starting and ending locations, and the number of miles driven. This documentation supports deductions for business travel, medical trips, charitable work, or moving expenses if applicable. While you can keep a handwritten log, digital mileage trackers make the process faster, easier, and more accurate. These apps can automatically record trips, categorize travel types, and generate IRS-ready reports at tax time. Failing to keep a proper mileage log may lead to denied deductions or IRS penalties. With rising fuel costs and tighter tax regulations, maintaining a mileage log isn’t just smart—it’s a financial necessity.