An IRS approved mileage log must include key details for each trip: the date, starting point, destination, purpose, and miles driven. The irs approved mileage log doesn’t mandate a specific format, but the log must be accurate, complete, and updated regularly. Apps like MileIQ and Everlance can automate tracking and produce IRS-ready reports. Supporting documents, such as annual odometer readings and service receipts, strengthen your claim. A well-maintained log ensures you stay compliant and make the most of your mileage deductions come tax time.