105 ILCS 5/17-9
When the county clerk determines the amount of taxes to be extended upon all the taxable property in any school district having a population of less than 500,000 inhabitants, he shall determine from the certified copies of bond resolutions filed in his office the amount necessary to pay the maturing principal of and interest on any bonds of the district and shall extend a separate tax sufficient to pay all principal and interest thereon which matures prior to the first delinquent date of taxes to be realized from the next succeeding tax extension or all interest and sinking fund requirements for the payment of principal which must be extended prior to said date. The separate tax shall be extended without limitation as to rate or amount. No deduction shall be made in the rate which may be extended for educational or operations, building and maintenance purposes by reason of any rate extended for payment of principal or interest of bonds, except as provided in this section, nor by reason of any tax required to be extended pursuant to the exercise of the power conferred in Section 10-22.12.
105 ILCS 5/17-9