[Code of Federal Regulations] [Title 5, Volume 2] [Revised as of January 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 5CFR831.401] [Page 95] TITLE 5--ADMINISTRATIVE PERSONNEL CHAPTER I--OFFICE OF PERSONNEL MANAGEMENT (CONTINUED) PART 831_RETIREMENT--Table of Contents Subpart D_Voluntary Contributions Sec. 831.401 Purpose and scope. Source: 56 FR 43863, Sept. 5, 1991, unless otherwise noted. This subpart describes the procedures that employees and Members must follow in making voluntary contributions under the Civil Service Retirement System (CSRS). This subpart also describes the procedures that the Office of Personnel Management (OPM) will follow in accepting voluntary contributions, crediting interest on voluntary contribution accounts, and paying benefits based on voluntary contributions.