[Code of Federal Regulations] [Title 5, Volume 3] [Revised as of January 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 5CFR1600.15] [Page 179] TITLE 5--ADMINISTRATIVE PERSONNEL CHAPTER VI--FEDERAL RETIREMENT THRIFT INVESTMENT BOARD PART 1600--EMPLOYEE ELECTIONS TO CONTRIBUTE TO THE THRIFT SAVINGS PLAN--Table of Contents Subpart E--Elections by Certain Senior Officials Who Were Brought Under Social Security Coverage on January 1, 1984, Pursuant to the Social Security Act Amendments of 1983 Sec. 1600.15 Officials covered by Social Security who elected to have no other retirement coverage. Officials who have only Social Security coverage have the option pursuant to 5 CFR 846.201 to transfer to FERS. Alternatively, such officials may elect CSRS offset coverage or may elect to continue to have no retirement coverage other than Social Security. If such officials transfer to FERS, they may make an election to participate in the Thrift Savings Plan under the rules and conditions described in Sec. 1600.12. If such officials elect coverage under the CSRS offset system, they may make an election to participate in the Thrift Savings Plan as a CSRS employee at the same time as the election to become subject to the CSRS offset system, or within 30 calendar days after the effective date of such election. If such officials continue coverage under Social Security only, they may not participate in the Thrift Savings Plan.