5 C.F.R. § 841.508
Effective date
The employee deductions specified in § 841.503 are effective on the later of the first day of the first pay period beginning in 1987 or the first day an employee is covered by FERS.
The employee deductions specified in § 841.503 are effective on the later of the first day of the first pay period beginning in 1987 or the first day an employee is covered by FERS.