Q: Does a certain amount of time have to elapse between when a CSRS employee retires and can be rehired as a part-time rehired annuitant?
A: No, there isn’t any amount of time that must pay, whether you are covered by CSRS of FERS. However, because hours of unused annual leave are projected forward as if you were still on the agency’s roll, you will have to repay any of the money that represents days which haven’t yet gone by. For example, if you were paid for 20 days of leave and went to work the day after you retired, you’d have to repay the entire amount. If you didn’t go back for five days, you’d have to repay 15 days worth.