Wash. Admin. Code § 415-108-491
In some circumstances specified in statute, a member may choose to establish service credit for periods of unpaid leave. The salary imputed to a member for purposes of calculating contributions owing for such periods of leave is not reportable compensation. Depending on the type of leave, the imputed compensation may or may not be included as average final compensation in calculating a member's retirement allowance.
(1) Unpaid authorized leave of absence. For information about purchasing service credit for periods of unpaid authorized leave of absence, see:
[Statutory Authority: RCW 41.50.050(5). WSR 04-20-005, § 415-108-491, filed 9/23/04, effective 10/24/04. Statutory Authority: RCW 41.50.050(5), 41.40.038, 41.40.170, 41.40.710, 41.40.805. WSR 02-03-120, § 415-108-491, filed 1/23/02, effective 3/1/02. Statutory Authority: RCW 41.50.050. WSR 98-09-059, § 415-108-491, filed 4/17/98, effective 5/18/98.]