Wash. Admin. Code § 415-112-473
If paid leave is not based upon earned leave accumulated over time, the payment is not for services previously provided and is generally not earnable compensation. Exceptions identified in RCW 41.32.267, 41.32.810 and 41.32.865 are reportable, and contributions are due on these payments to the extent they meet both of the following conditions:
[Statutory Authority: RCW 41.50.050(5), 41.32.267, 41.32.810, 41.32.865. WSR 05-12-108, § 415-112-473, filed 5/27/05, effective 6/27/05. Statutory Authority: RCW 41.50.050. WSR 00-10-015, § 415-112-473, filed 4/21/00, effective 5/22/00; WSR 97-03-016, § 415-112-473, filed 1/6/97, effective 2/6/97.]