Actually, you're probably better off in CSRS Offset because you're earning benefits under both Social Security and CSRS.
Your combined benefits under Social Security and CSRS Offset will be at least the same as, if not more than, what you would have received under Social Security and CSRS if your record had not been corrected.
While working, you are earning retirement credits under the relatively generous CSRS formula. You also are adding to any Social Security benefits you have already earned, increasing your career earnings under Social Security and, as a result, your Social Security benefit.
When you retire, OPM will compute your CSRS Offset benefit under the same rules that apply to other CSRS retirees. When you become eligible for Social Security benefits, OPM will reduce your benefit. This reduction is based on the value of the Social Security benefit you earned during your CSRS Offset service. In other words, instead of getting one check from OPM for all of your Federal service, some of the payment will come from the Social Security Administration.
In addition, with more of your retirement income paid from Social Security, you have an increased tax advantage because part, or all, of your Social Security benefit will be exempt from Federal income tax. Only a small portion of a CSRS, or CSRS Offset, benefit is exempt from Federal income tax.
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