The IRS has announced that a mileage rate used for certain tax purposes will fall to 53.5 cents per mile in 2017 from the 54 cents per mile currently. GSA typically, but not necessarily, follows that IRS rate in setting the mileage reimbursement rate for federal employees using a personal vehicle on official business. There are lower rates for using a personal vehicle when a government vehicle is available or for using a motorcycle, which generally move up or down with the main mileage rate.