If you were partially reimbursed for your employee business miles, your total business miles and reimbursements for the current year are entered on IRS Form 2106 Employee Business Expenses. To input this information in the TaxAct® program:
The program will calculate the difference between the two amounts for your deduction. For example, if you drove 100 miles, your standard mileage deduction would be $56 (100 x .56). If your employer reimbursed you at a rate of 20 cents per mile, you would enter $20 in the reimbursement field (100 x .20). Your total mileage deduction on Form 2106 would be $36 (56 - 20).
See Standard Mileage Rates for more information.