To accurately track mileage for reimbursement, use a mileage log or digital tool that records the date, destination, purpose of the trip, and miles traveled. This can be done manually using spreadsheets or notebooks, or through dedicated mileage tracking apps that automatically capture travel details via GPS. Ensure logs are detailed and match your expense claim, as they are often required for tax purposes or employer review. Many businesses prefer digital apps as they reduce the risk of errors and make it easier to generate accurate reports.