§ 92. Payment of premiums. 1. Workers' compensation insurance premiums for any policy period shall be paid into the state insurance fund at the beginning of the period when the amount of such premium is less than one thousand dollars according to the estimated expenditure of wages for the period except to the extent that rules of the commissioners permit such amount to be paid by installments. For all other policyholders, workers' compensation insurance premiums for any policy period based on an estimated expenditure of wages for the period may, at the policyholders' option, be paid into the state insurance fund by installments in accordance with rules promulgated by the commissioners.

2. Disability benefits insurance premiums for any period shall be paid into the state insurance fund at the beginning of the period according to the estimated expenditure of wages for the period except to the extent that rules of the commissioners permit such amount to be paid by installments.

3. At the end of the period an adjustment of the premium shall be made according to the actual expenditure of wages. If such adjusted premium is more than the premium paid at the beginning of the period, the policyholder shall pay the difference immediately upon notification of the amount due except to the extent that rules promulgated by the commissioners permit such amount to be paid by installments. If such adjusted premium is less than the premium paid in advance, the state insurance fund shall, at the policyholder's option, either refund the difference or credit the amount thereof to the policyholder's account with the state insurance fund.