Such agreements may provide for the compensation of any purchasers or underwriters of such refunding notes or bonds by payment of a fixed fee or commission at the time of issuance thereof, and for all other costs and expenses, including fees for agreements related to such refunding notes or bonds and paying agent costs. Costs and expenses of issuance may be paid from the proceeds of the refunding notes or bonds.
At such times as the balance requirements of this paragraph are met, the State Treasurer shall transfer all excess amounts to the State Highway Fund.