41 CFR § 301-2.2 - What travel expenses may my agency pay?
Your agency may pay only those expenses essential to the transaction of official business, which include:
(a) Transportation expenses as provided in part 301–10 of this chapter;
(b) Per diem expenses as provided in part 301–11 of this chapter;
(c) Miscellaneous expenses as provided in part 301–12 of this chapter; and
(d) Travel expenses of an employee with special needs as provided in part 301–13 of this chapter.