(1) A member insurer may offset against its premium tax liability to this state an assessment described in section 41-4309(8), Idaho Code, to the extent of twenty percent (20%) of the amount of the assessment for each of five (5) calendar years beginning with the premium tax due under section 41-402(4), Idaho Code, with respect to the year of payment of the assessment and thereafter with the premium tax due under section 41-402(4), Idaho Code, during each of the four (4) succeeding years. An allowable offset, or portion thereof, not used in any calendar year cannot be carried over or back to any other year.
(2)  Any sums acquired by refund, pursuant to section 41-4309(6), Idaho Code, from the association which have theretofore been written off by contributing insurers and offset against premium taxes as provided in subsection (1) of this section, and are not then needed for purposes of this chapter, shall be paid by the association to the director and by him deposited with the state treasurer for credit to the general account of the state operating fund.