If you are an employee, your use of your personal vehicle is an employee expense. Unreimbursed employee expenses are deductible, however they are itemized deductions and subject to the 2% rule so your benefit may be limited by your other tax situations.
To deduct work-related use of your vehicle, you must have a mileage log, diary, or keep track with an app, so you keep track of your business mileage (time, date, purpose, # of miles). You can't deduct your daily commute to and from work, but if you travel to more than one job site in a day, that mileage qualifies. You can deduct the standard mileage rate which is about 54 cents per mile. However, you have to reduce the reimbursement by any tax-free partial reimbursements such as fuel. If you enter the vehicle details and your work mileage, then go a few pages later and the program will ask if you received any tax free reimbursements. The program will compute your net expense deduction and if it is more than 2% of your income, it will be added as a deduction on schedule A.
