What can I elect if I was put in CSRS or CSRS Offset by mistake?

CFR · 2024-01-01 · US · Title 5

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

official document · source cfr-2024 · id 5:§ 839.401