[Code of Federal Regulations] [Title 41, Volume 4] [Revised as of July 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 41CFR301-11.302] [Page 49] TITLE 41--PUBLIC CONTRACTS AND PROPERTY MANAGEMENT CHAPTER 301--TEMPORARY DUTY (TDY) TRAVEL ALLOWANCES PART 301-11_PER DIEM EXPENSES--Table of Contents Subpart D_Actual Expense Sec. 301-11.302 When should I request authorization for reimbursement under actual expense? Request for authorization for reimbursement under actual expense should be made in advance of travel. However, subject to your agency's policy, after the fact approvals may be granted when supported by an explanation acceptable to your agency.