Definition. The total sum of money due for the purchase of a good or service that must be paid by the set due date. In relation to taxes, the money owed to the government when required tax amount totals a greater number than total tax payments previously made.efinition. The total sum of money due for the purchase of a good or service that must be paid by the set due date. In relation to taxes, the money owed to the government when required tax amount totals a greater number than total tax payments previously made.
The Internal Revenue Service has set the special per diem rates starting Oct. 1, 2015, which taxpayers can use to substantiate the amount of expenses for lodging, meals, and incidental expenses when traveling away from home.
Per diem is the daily allowance for lodging (excluding taxes), meals and incidental expenses. These rates are established by the General Services Administration for destinations in the lower 48 contiguous United States only and by the U.S. Department of Defense for locations in Alaska, Hawaii and the U.S. territories.er diem is the daily allowance for lodging (excluding taxes), meals and incidental expenses. These rates are established by the General Services Administration for destinations in the lower 48 contiguous United States only and by the U.S. Department of Defense for locations in Alaska, Hawaii and the U.S. territories.