CFR > Title 5 - Administrative Personnel > CHAPTER I—OFFICE OF PERSONNEL MANAGEMENT > SUBCHAPTER B—CIVIL SERVICE REGULATIONS (parts 110 to 990) > PART 839—CORRECTION OF RETIREMENT COVERAGE ERRORS UNDER THE FEDERAL ERRONEOUS RETIREMENT COVERAGE CORRECTIONS ACT > SUBPART H—Adjusting Retirement Deductions and Contributions (§839.801 to §839.822) > 839.802—If I was in CSRS during my qualifying retirement coverage error, paid into the Fund more than I would have paid as a CSRS Offset, Social Security-Only, or FERS employee, and end up retr

839.802—If I was in CSRS during my qualifying retirement coverage error, paid into the Fund more than I would have paid as a CSRS Offset, Social Security-Only, or FERS employee, and end up retr

CSRS Offset and FERS require employees to pay Social Security taxes in addition to retirement deductions. When you are retroactively changed under the FERCCA to CSRS Offset, FERS, or Social Security-Only, the deductions you paid in under CSRS will be used to pay both the amounts required for retirement deductions under CSRS Offset or FERS, as applicable to you, and also the Social Security taxes that you would have paid had you been in CSRS-Offset, FERS, or Social Security-Only.