65 ILCS 5/8-5-16
The corporate authorities of any municipality which is not a home rule unit under the Constitution of 1970 are authorized to issue the bonds of such municipality without referendum subject to the limitation contained herein and the requirements of the Bond Issue Notification Act. Such bonds shall be payable from ad valorem tax receipts. The amount of such bonds, together with other bonds issued pursuant to this Section and outstanding, shall not exceed at the time of issue one-half of 1% of the assessed value of all of the taxable property located within the municipality.
Such bonds shall be authorized by a bond ordinance adopted by the corporate authorities of the municipality. The bond ordinance shall make provision for the payment of the principal of and interest on the bonds by the levy of a direct annual irrepealable tax upon all of the taxable property within the municipality. A properly certified copy of the bond ordinance shall be filed in the office of the county clerk of each county in which any portion of the municipality is situated. Such county clerk or clerks shall extend the taxes levied in the bond ordinance for collection against all of the taxable property situated within the municipality. The taxes levied in the bond ordinance shall be extended annually by the county clerk or clerks without limitation as to rate or amount and such taxes shall be in addition to and in excess of all other taxes levied or authorized to be levied by the municipality.
Bonds heretofore or hereafter issued and outstanding which are approved by referendum, bonds issued under this Section which have been paid in full or for which provision for payment has been made by an irrevocable deposit of funds in an amount sufficient to pay the principal and interest on any such bonds to their respective maturity date, non-referendum bonds issued pursuant to other provisions of this Code, and bonded indebtedness assumed from another municipality, shall not operate to limit in any way the right of the municipality to issue its non-referendum bonds in accord with this Section.
65 ILCS 5/8-5-16