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.
[Statutory Authority: RCW 82.38.260
. WSR 09-07-075, § 308-77-075, filed 3/16/09, effective 4/16/09; WSR 01-22-073, § 308-77-075, filed 11/1/01, effective 12/2/01.]