(Victor Valley)–The Internal Revenue Service (IRS) recently announced an increase in the optional standard mileage rates for the final six months of 2011. The rate will increase to 55.5 cents a mile for all business miles driven from July 1, 2011, through December 31, 2011. An increase of 4.5 cents from the 51-cent prior rate. The IRS made this special adjustment for the final months of 2011 in recognition of recent gasoline price increases. While the price of gas is a significant factor in calculating the mileage figure, other items enter into the calculation of mileage rates, such as depreciation, insurance and other fixed and variable costs. The new six-month rate for computing deductible medical or moving expenses will also increase by 4.5 cents to 23.5 cents a mile, up from 19 cents for the first six month of 2011. The rate for providing services for charitable organizations is set by statute, not the IRS, and remains at 14 cents a mile. For more information, visit the IRS website at www.irs.gov.