65 ILCS 5/9-2-89
In counties having a population of less than 1,000,000, any person owning or claiming land or lots upon which judgment is prayed, as provided in this Division 2, may pay the special taxes, special assessments, interest, and costs due thereon to the collector of the municipality in which the land or lots are situated at any time before sale. On the day fixed for sale, the collector shall report, under oath, to the county clerk, all the land or lots upon which special assessments have been paid, if any, after the time of making the return mentioned in Section 9-2-85 and prior to that day. The clerk shall note this fact opposite each tract or lot upon which those payments have been made. This report shall include a statement by the collector, under oath, that notice of sale has been sent by mail, by letter or post card, as to all other land or lots included in the report as required by Section 9-2-88.
65 ILCS 5/9-2-89