105 ILCS 5/10-22.14
To borrow money, and issue bonds for the purposes and in the manner provided by this Act.
When bond proceeds from the sale of bonds include a premium, or when the proceeds of bonds issued for fire prevention, safety, energy conservation, and school security purposes as specified in Section 17-2.11 are invested as authorized by law, the board shall determine by resolution whether the interest earned on the investment of bond proceeds authorized under Section 17-2.11 or the premium realized in the sale of bonds, as the case may be, is to be used for the purposes for which the bonds were issued or, instead, for payment of the principal indebtedness and interest on those bonds.
When bonds, other than bonds issued for fire prevention, safety, energy conservation, and school security purposes as specified in Section 17-2.11 are issued by any school district, and the purposes for which the bonds have been issued are accomplished and paid for in full, and there remain funds on hand from the proceeds of the bonds so issued, the board by resolution may transfer those excess funds to the operations and maintenance fund.
When bonds are issued by any school district for fire prevention, safety, energy conservation, and school security purposes as specified in Section 17-2.11, and the purposes for which the bonds have been issued are accomplished and paid in full, and there remain funds on hand from the proceeds of the bonds issued, the board by resolution shall use those excess funds (1) for other authorized fire prevention, safety, energy conservation, and school security purposes as specified in Section 17-2.11 or (2) for transfer to the Bond and Interest Fund for payment of principal and interest on those bonds. If any transfer is made to the Bond and Interest Fund, the secretary of the school board shall within 30 days notify the county clerk of the amount of that transfer and direct the clerk to abate the taxes to be extended for the purposes of principal and interest payments on the respective bonds issued under Section 17-2.11 by an amount equal to such transfer.
105 ILCS 5/10-22.14