The board may postpone the payment of any amount due a contracting agency on termination of a contract if payment would require the sale of securities, that, in the opinion of the board, would affect adversely the interests of this system.
If the board delays a payment longer than the period reasonably necessary for the determination of the amount due and for the necessary action by the board, interest shall be allowed on the amount remaining due and unpaid from time to time at the rate then in use under this system, and paid to the contracting agency at the same time and in the manner as the original amount due.