5 CFR §839.241
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
If you were in CSRS or CSRS Offset and should have been in FERS or Social Security-Only, or if you were in FERS and should have been in CSRS, CSRS Offset, or Social Security-Only, then you have an election opportunity. This is summarized in the following chart: