The IRS has published a
The per diem rates are used to substantiate the amount of expenses used for lodging, meals and incidental costs when traveling away from home, including:
- The special transportation industry rate;
- The rate for the incidental expenses only deduction; and,
- Rates and list of high-cost localities for purposes of the high-low substantiation method.
Use of a per diem substantiation method is not mandatory. A taxpayer may use actual allowable expenses if they maintain adequate records or other sufficient evidence for substantiation.