The Internal Revenue Service has increased the optional standard mileage rate to 55.5 cents per mile for all business miles driven from July 1, 2011 through December 31, 2011. Taxpayers may use the optional standard rates to calculate the deductible costs of operating an automobile for business and other purposes. The rate in effect for the first six months of 2011 was 51 cent per mile. The optional business standard mileage rate is used to compute the deductible costs of operating an automobile for business use, instead of tracking the actual costs of operating an automobile. The rate for providing services for charitable organizations, which is set by statute, remains at 14 cents per mile.