What Is the IRS Per Diem Allowance for Mileage?

As of Jan. 1, 2015, the Internal Revenue Service allowance for mileage is 57.5 cents per mile when driving for business, or 23 cents per mile driven for moving or medical purposes, according to the IRS. When serving charitable organizations, the allowance is 14 cents per mile driven.

The 2015 standard mileage rates, which apply when using vans, cars, and panel or pickup trucks, reflect a 1.5 cent per mile increase from the 56-cent business allowance of 2014, and a 0.5-cent decrease from 2014 in the moving or medical purposes allowance. The charitable organizations allowance for 2015 remained the same as its 2014 rate, notes the IRS. Taxpayers can choose to apply the standard mileage rates or claim the deductions based on the actual vehicle operating costs.

Per diem is the allowance for lodging, meals and incidental expenses, not including taxes, according to the U.S. General Services Administration. The GSA sets per diem rates for destinations within the United States except Alaska and Hawaii, which are set by the Department of Defense.