(a) The commissioner shall establish and maintain an adequate system of accounts and records for the plan. The accounts and records shall be integrated with the accounts, records, and procedures of the employers to the end that they operate most effectively and at minimum expense, and that duplication of records and accounts is avoided.

(b) An individual account shall be maintained for each employee to record the amount of the employee's mandatory contributions collected under AS 39.35.160(a). As of the last day of each calendar year and of each fiscal year, this account shall be credited with interest by applying the prescribed rate of interest, as determined by the board, to the balance in the account as of that date. When the employee is appointed to retirement, the amount held in the individual account shall be used first to fully finance the benefits paid. Once this account has been exhausted, the plan shall fully finance the benefits paid that were not financed by the employee's individual account.

(c) An individual account shall be maintained for each employee to record the amount of the employee's voluntary contributions to an employee savings account under AS 39.35.180. As of the last day of each calendar year and of each fiscal year, this account shall be credited with interest by applying the prescribed rate of interest, as determined by the board, to the balance in the account as of that date. Amounts that, before termination of employment, are withdrawn by an employee from the employee's savings account shall be charged to that account. When an employee is appointed to retirement, the amount held in the employee's savings account shall be paid in accordance with AS 39.35.395.