What if my payment due date falls on a Saturday, Sunday, or state legal holiday? Payment is due on the next state business day. For example, if the payment due date falls on Saturday, the payment must be postmarked by Monday.
Wash. Admin. Code § 308-77-075
Statutory Authority: RCW 82.38.260. 09-07-075, § 308-77-075, filed 3/16/09, effective 4/16/09; 01-22-073, § 308-77-075, filed 11/1/01, effective 12/2/01.