RCW 83.110A.090: Right of reimbursement.

(1) A person required under RCW 83.110A.080 to pay an estate tax greater than the amount due from the person under RCW 83.110A.020 or 83.110A.030 has a right to reimbursement from another person to the extent that the other person has not paid the tax required by RCW 83.110A.020 or 83.110A.030 and a right to reimbursement ratably from other persons to the extent that each has not contributed a portion of the amount collected under RCW 83.110A.080(2).

(2) A fiduciary may enforce the right of reimbursement under subsection (1) of this section on behalf of the person that is entitled to the reimbursement and shall take reasonable steps to do so if requested by the person.