35 ILCS 200/21-405
When property has been forfeited for delinquent general taxes or special assessments, a person desiring to purchase the property shall make application to the county clerk. The application shall be accompanied by a fee of $10 in counties with 3,000,000 or more inhabitants and $5 in counties with less than 3,000,000 inhabitants for each item on which application is made. The county clerk shall promptly send notice by registered or certified mail, return receipt requested, to the party in whose name the general taxes were last assessed or paid. The notice shall adequately describe the property, shall state the name and address of the party in whose name the general taxes were last assessed or paid, shall recite that application has been made to purchase the property for forfeited taxes or special assessments and that the property will be sold unless redemption is made within 30 days of the mailing of notice. For 30 days after the mailing, the property may be redeemed under Section 21-370.
If redemption is not made, the county clerk shall receive from the purchaser the amount due on forfeited special assessments, together with the interest, costs and penalties thereon fixed by law, and shall issue an order to the county collector directing him or her to receive from the purchaser the amount of the forfeited general taxes, together with the costs, interest, fees and forfeiture interest provided in Section 21-370. In the order, the county clerk shall recite the amounts received by him or her on account of forfeited special assessments and shall direct the county collector to issue a receipt in the form of a certificate of purchase. Upon presentation of the order of the county clerk, the county collector shall receive the amount due on account of forfeited general taxes, and shall issue a receipt therefor in the form of a certificate of purchase.
The certificate of purchase shall set forth a description of the property, and the amount paid by the purchaser on account of general taxes and special assessments, and shall be countersigned by the county clerk. When so countersigned, the certificate of purchase shall be evidence of the sale of the property and of the receipt by the county collector of the amounts ordered to be received by him or her by the county clerk on account of general taxes, and evidence of receipt by the county clerk of the amount received by him or her on account of forfeited special assessments. A certificate of purchase shall not be valid until it is countersigned by the county clerk. Upon countersigning the certificate, the county clerk shall make a proper entry of the sale of the property on the appropriate books, and charge the amount of the sale money of forfeited general taxes to the collector.
Property purchased under this Section shall be subject to redemption, notice, etc., the same as if sold under Section 21-110 through 21-120. Any special assessment which has been withdrawn from collection by the municipality levying it shall not be subject to sale, but the purchaser, prior to the entry of any order for the issuance of a tax deed based on a sale under this Section, shall pay to the officer entitled to receive the amount due on all the withdrawn special assessments. The purchaser may file his or her receipts with the county clerk and have them posted on the tax judgment, sale, redemption and forfeiture record at the same rate of penalty and in the same manner as in the case of payment of taxes and special assessments accruing after the sale, as provided in Section 21-355.
This Section does not apply to any application or forfeiture that occurs on or after January 1, 2024.
35 ILCS 200/21-405