(a) Phased employment is effective the first day of the first pay period beginning after phased employment is approved by the authorized agency official under §831.1713(a), or the first day of a later pay period specified by the employee with an authorized agency official's concurrence.

(b) The commencing date of a phased retirement annuity (i.e., the beginning date of the phased retirement period) is the first day of the first pay period beginning after phased employment is approved by an authorized agency official under §831.1713(a), or the first day of a later pay period specified by the employee with the authorized agency official's concurrence.