5 C.F.R. § 1600.13 Timing of agency contributions.
Title 5 - Administrative Personnel
(a) Employees not previously eligible to receive agency contributions. An employee appointed or reappointed to a position covered by FERS who had not been previously eligible to receive agency contributions is eligible to receive agency contributions under the following rules: (1) If the effective date of the appointment is any day during the period June 1 through November 30, the agency contributions must begin the first full pay period of the following June; and (2) If the effective date of the appointment is any day during the period December 1 through May 31, the agency contributions must begin the first full pay period of the following December. (b) Employees previously eligible to receive agency contributions. An employee reappointed to a position covered by FERS who was previously eligible to receive agency contributions is immediately eligible to receive agency contributions. [70 FR 32207, June 1, 2005]
Title 5: Administrative Personnel
PART 1600—EMPLOYEE CONTRIBUTION ELECTIONS AND CONTRIBUTION ALLOCATIONS
Subpart B—Elections
§ 1600.13 Timing of agency contributions.