5 C.F.R. § 839.501

What can I elect if my employer moved me out of CSRS or CSRS Offset?

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If you were moved out of CSRS or CSRS Offset due to a qualifying retirement coverage error and were placed in FERS, you may elect CSRS Offset or remain in FERS. If you were moved out of CSRS or CSRS Offset due to a qualifying retirement coverage error and were placed in Social Security-Only, you may elect CSRS Offset or remain in Social Security-Only. This is summarized in the following chart:

You were in:And your coverage was previously
corrected to:
You may elect:
CSRSFERSCSRS Offset or FERS.
CSRS OffsetFERS
CSRSSocial Security-OnlyCSRS Offset or Social Security-Only.
CSRS OffsetSocial Security-Only.