(1) A member insurer may offset against its premium tax liability to this state an assessment described in RCW 48.32A.085(8) to the extent of twenty percent of the amount of the assessment for each of the five calendar years following the year in which the assessment was paid. In the event a member insurer ceases doing business, all uncredited assessments may be credited against its premium tax liability for the year it ceases doing business.

(2) Any sums that are acquired by refund, under RCW 48.32A.085(6), from the association by member insurers, and that have been offset against premium taxes as provided in subsection (1) of this section, must be paid by the insurers to the commissioner and then deposited with the state treasurer for credit to the general fund of the state of Washington. The association shall notify the commissioner that refunds have been made.