[Code of Federal Regulations] [Title 5, Volume 2] [Revised as of January 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 5CFR845.307] [Page 359] TITLE 5--ADMINISTRATIVE PERSONNEL CHAPTER I--OFFICE OF PERSONNEL MANAGEMENT (CONTINUED) PART 845_FEDERAL EMPLOYEES RETIREMENT SYSTEM_DEBT COLLECTION--Table of Subpart C_Standards for Waiver of Overpayments Sec. 845.307 Burdens of proof. (a) Burden of OPM. The Associate Director must establish by the preponderance of the evidence that an overpayment occurred. (b) Burden of annuitant. The recipient of an overpayment must establish by substantial evidence that he or she is eligible for waiver or an adjustment.