Section 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.