Yes, all transportation bills and payments must undergo a prepayment audit unless your agency's prepayment audit program uses a statistical sampling technique of the bills or the Administrator of General Services grants a specific waiver from the prepayment audit requirement. If your agency chooses to use statistical sampling, all bills must be at or below the Comptroller General specified limit of $2,500.00 (31 U.S.C. 3521(b) and U.S. Government Accountability Office Policy and Procedures Manual Chapter 7, obtainable from:
Code of Federal Regulations
[65 FR 24569, Apr. 26, 2000, as amended at 74 FR 30476, June 26, 2009]