105 ILCS 5/19-11
Any district which has complied with Section 19-9 and which is authorized to issue bonds under Sections 19-8, 19-9 and 19-10 shall adopt a resolution specifying the amount of indebtedness to be funded, whether for the purpose of paying claims, or for paying teachers' orders, or for paying liabilities or obligations imposed on any district resulting from the division of assets as provided by Article 7 of this Act or Article 5 of this Act as it existed prior to July 1, 1952. The resolution shall set forth the date, denomination, rate of interest and maturities of the bonds, fix all details with respect to the issue and execution thereof, and provide for the levy of a tax sufficient to pay both principal and interest of the bonds as they mature. The bonds shall bear interest at a rate not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, payable annually or semi-annually, as the governing body may determine, and mature in not more than 20 years from the date thereof or as otherwise authorized by law.
With respect to instruments for the payment of money issued under this Section either before, on, or after the effective date of this amendatory Act of 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Acts.
105 ILCS 5/19-11