Wash. Rev. Code § 11.104B.560
(1) A fiduciary shall allocate an income receipt or disbursement, other than a receipt to which RCW 11.104B.500(2) applies, to principal if its due date occurs before the date on which:
(4) A receipt or disbursement is periodic under subsections (2) and (3) of this section if:
(6) Distributions to shareholders or other owners from an entity to which RCW 11.104B.200 applies are due:
[ 2021 c 140 s 2702.]