You may not have a choice about Social Security coverage.
If you should have had Social Security coverage during your Federal employment, then you must have Social Security coverage in addition to your Federal retirement coverage. FERCCA does not allow you to choose a retirement plan without Social Security coverage.
If you were incorrectly put in CSRS when you should have been put in CSRS Offset, your retirement coverage must be corrected to CSRS Offset.
Likewise, if you were incorrectly put in CSRS Offset when you should have been put in CSRS, your retirement coverage must be corrected to CSRS because you are not eligible for Social Security coverage during your Federal employment. You cannot choose to keep your Social Security coverage. However, Social Security will give you credit for all but the last 3 years before your record was corrected. See the question I should have been CSRS. Instead, I paid into Social Security. What happens to the Social Security taxes I paid when my agency corrects my retirement coverage to CSRS? for more information.
If you were erroneously put in FERS and should have been put in CSRS, then you will have a chance to choose whether you want to keep FERS (and Social Security) coverage.
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