105 ILCS 5/12-16
Any non-high school district which has complied with Section 12-15 and which is authorized to issue bonds thereunder shall adopt a resolution authorizing their issuance. 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 separate 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 board of education may determine, and mature in not more than 20 years from the date thereof.
A certified copy of the resolution authorizing the issue of the bonds shall be filed with the county clerk of the county in which the non-high school district is situated and the county clerk shall annually extend taxes against all of the taxable property in the non-high school district in amounts sufficient to pay maturing principal and interest of the bonds without limitation as to rate and amount, and in addition to and in excess of any taxes authorized to be levied by the district.
The bonds may be exchanged par for par for unpaid tuition claims or such judgment or judgments or other unpaid claims or both, or may be sold and the proceeds used to pay such claims or judgments.
Purchasers of bonds shall not be obligated to inquire into the validity of the claims funded thereby but the determination of the board of education by resolution to issue them shall be conclusive evidence of the validity of the claims thereby funded.
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 5/12-16