[Code of Federal Regulations] [Title 5, Volume 3] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 5CFR1600.21] [Page 188] TITLE 5--ADMINISTRATIVE PERSONNEL CHAPTER VI--FEDERAL RETIREMENT THRIFT INVESTMENT BOARD PART 1600_EMPLOYEE CONTRIBUTION ELECTIONS AND CONTRIBUTION ALLOCATIONS--Table Subpart C_Program of Contributions Sec. 1600.21 Contributions in whole numbers. Employees may elect to contribute a percentage of basic pay or a dollar amount, subject to the limits described in Sec. 1600.22. The election must be expressed in whole percentages or whole dollar amounts.