(a) The trustees may assess from time to time members of a commercial self-insurance fund liable therefor under the terms of their policies and pursuant to this section, or the Commissioner may assess the members in the event of liquidation of the fund.
(b) Each member's share of a deficiency for which an assessment is made shall be computed by applying to the premium earned on the member's policy or policies during the period to be covered by the assessment the ratio of the total deficiency to the total premiums earned during such period upon all policies subject to the assessment. In the event one or more members fail to pay an assessment, the other members are liable on a proportionate basis for an additional assessment. The fund, acting on behalf of all members who paid the additional assessment, shall institute legal action when necessary and appropriate to recover the assessment from members who failed to pay it.
(c) In computing the earned premiums for the purposes of this section, the gross premium received by the fund for the policy shall be used as a base, deducting therefrom charges not recurring upon the renewal or extension of the policy.
(d) No member shall have an offset against any assessment for which he is liable on account of any claim for unearned premium or losses payable.