The Internal Revenue Service today announced an increase in the optional standard mileage rates for the final six months of 2008. Taxpayers may use the optional standard rates to calculate the deductible costs of operating an automobile for business, charitable, medical or moving purposes.

The rate will increase to 58.5 cents a mile for all business miles driven from July 1, 2008, through Dec. 31, 2008. This is an increase of eight (8) cents from the 50.5 cent rate in effect for the first six months of 2008, as set forth in Rev. Proc. 2007-70.

In recognition of recent gasoline price increases, the IRS made this special adjustment for the final months of 2008. The IRS normally updates the mileage rates once a year in the fall for the next calendar year.