(a) On determination by the division that a certified self-insurer has become an impaired employer, the commissioner shall secure release of the security deposit required by this chapter and shall promptly estimate:
(1) the amount of additional funds needed to supplement the security deposit;
(2) the available assets of the impaired employer for the purpose of making payment of all incurred liabilities for compensation; and
(3) the funds maintained by the association for the emergency payment of compensation liabilities.
(b) The commissioner shall advise the board of directors of the association of the estimate of necessary additional funds, and the board shall promptly assess each certified self-insurer to collect the required funds. An assessment against a certified self-insurer shall be made in proportion to the ratio that the total paid income benefit payment for the preceding reported calendar year for that self-insurer bears to the total paid income benefit payment by all certified self-insurers, except impaired employers, in this state in that calendar year.

(c) A certified self-insurer designated as an impaired employer is exempt from assessments beginning on the date of the designation until the division determines that the employer is no longer impaired.