75 ILCS 35/9
It shall be the duty of the county clerk when making out the tax books for the collector to compute each taxable person's taxes in such township upon the total amount of taxable property as equalized by the State Board of Equalization for that year, whether belonging to residents or non-residents, and also each and every tract of land assessed by the assessor, which lies in such township. Such computation shall be made so as to realize the amount of money required to be raised in such township, as shown and set forth in the certificate of tax levy, made out by the board of directors of such public library and filed with the said county clerk as required by the provisions of this act. The said county clerk shall cause each person's tax so computed to be set upon the tax books to be delivered to the collector for that year in a separate column, against each taxpayer's name, or parcel of taxable property, as it appears in said collector's books, to be collected in the same manner and at the same time and by the same persons as state and county taxes are collected. The computation of each person's tax and the levy made by the clerk, as aforesaid, shall be final and conclusive: Provided, that the rate shall be uniform and shall not exceed that required by the amount certified by the board of directors as aforesaid, together with the estimated cost of extending and collecting the same.
75 ILCS 35/9