By Illinois Compiled Statutes the Will County Treasurer is required to sell any taxes that have not been paid in full for the current tax year.
(35 ILCS 200/22-5) You must redeem your taxes within one year of the Date of Sale for the following classifications: (1) vacant non-farm property; (2) property containing an improvement consisting of a structure or structures with 7 or more residential units; and (3) commercial or industrial property. You must redeem your taxes within 2 1/2 years of the Date of Sale for the following classifications: (1) all residential property with less than 6 units; and (2) all other property not covered by the 1-year redemption period outlined above.