Do I have to pay back my buyout if I am re-employed?
Typically, a buyout recipient who returns to work for the federal government within five years must repay the entire pre-tax amount. This includes employment with any part of the federal government, including the Postal Service, and all types of work schedules. Repayment for re-employment with the federal government may be waived by OPM only in rare instances—where the individual involved possesses unique abilities and is the only qualified person available.

Depending on the specific buyout authority, this requirement might also apply to re-employment under personal services contracts. There is no provision for waivers in that case.