The IRS raised the standard mileage rates, used to calculate certain tax deductions for business and other uses of automobiles. Rates are typically adjusted for inflation annually, however, with rapid rising gas prices, the new rates took effect in the middle of the year, on July 1, 2022, and are effective until December 31, 2022. Tax deductions for business use of a vehicle, medical travel, and charitable use of a car are among the rates affected.