In December, the IRS issued the 2016 optional standard mileage rates used to calculate the deductible costs of operating an automobile for business, medical, moving and charitable purposes. The optional business standard mileage rate for 2016 is 54 cents per mile, a decrease of 3.5 cents compared to 2015. The optional standard mileage rate for medical and moving expenses for 2016 is 19 cents per mile, a decrease of four cents compared to 2015. The optional standard mileage rate for charitable expenses is set by statute and remains at 14 cents per mile.