The Internal Revenue Service issued the 2013 optional standard mileage rates used to calculate the deductible costs of operating an automobile for business, charitable, medical or moving purposes. Effective January 1, 2013, the standard mileage rates for the use of a car (also vans, pickups or panel trucks) will be: 56.5 cents per mile for business miles driven, 24 cents per mile driven for medical or moving purposes, and 14 cents per mile driven in service of charitable organizations.