Land · Illinois tax sale guide

Cook County tax sales, Illinois

Verified

Cook is the largest tax sale in Illinois and runs on its own scale: the tax year 2023 annual sale was delayed into December 2026 by state law (P.A. 104-0460) and offers 9,481 eligible properties, the fewest since at least 1994 by the Treasurer's own count. Bidding runs on the RealAuction platform, but final bids can only be placed from the computers in the Treasurer's Sale Room in Chicago, so Cook is an in person sale wearing an online interface. Cook also holds the state's only scavenger sale, a separate cash sale of parcels with three or more delinquent tax years; it runs only when the County Board directs one, and none is currently scheduled.

Selling office: Cook County Treasurer Maria Pappas, as ex officio County Collector

Next sale: Tax year 2023 annual tax sale, Tuesday, December 15 to Friday, December 18, 2026, 8:30 AM to 5:00 PM, with a re-offer day Monday, December 21, 2026. Dates, hours and the township volume group schedule are from the Treasurer's annual tax sale page, read November 9, 2026. Registration ran online November 6 to December 4, 2026, and the collateral deposit had to be received by December 4, 2026 at 5:00 PM Chicago time.

The December 2026 sale covers tax year 2023, delayed by P.A. 104-0460. The Treasurer's count of 9,481 eligible properties is the smallest annual sale list since at least 1994.

Dates and deadlines

Sources: Cook County Treasurer, Annual Tax Sale. Cook County Treasurer, Tax Sale General Information. Confirm with the selling office before relying on any date on this page: sales move, terms change, and parcels are pulled up to sale day.

Research Cook County parcels before you bid

A sale list gives you the parcels, the date, and the opening terms. It does not give you the owner, the value, or the rest of the picture: liens, foreclosure status, and parcel history. PropertyRadar is the data platform for that layer. It carries owner records, assessed and market values, foreclosure and tax data, and property history for parcels across Cook County, searchable by address, owner, or county, including parcels that never reach a sale list.

Open a PropertyRadar accountSee plans and pricing

Pine and Brass is a PropertyRadar partner. If you open an account through these links, we may earn a commission; it does not change the price you pay.

How Illinois tax lien sales work

• Judgment comes first. When taxes stay unpaid, the county treasurer, acting as ex officio county collector, applies to the circuit court for judgment and order of sale against the delinquent parcels (Section 21-190). The delinquent list is advertised, and only parcels under judgment go to the sale. There is no deed on offer at any point in this process: Illinois sells the taxes, and the property changes hands only years later, through a separate court case, if it changes hands at all.
• Buyers register early, and bid as one entity. Registration with the collector is required at least 10 business days before the first day of sale (Section 21-220), and counties close their own windows earlier. In counties of 275,000 or more people, the single bidder rule (Section 21-205(b-5)) requires related buyers to bid as one. Since 2013 the sale itself must be run on an automated bidding system or recorded, which is why so many Illinois sales work through RAMS and a USB drive of bids.
• The annual sale sells a lien certificate, priced by a penalty bid-down. Bidding is by penalty percentage and goes down: the lowest penalty wins. Public Act 104-553, effective July 10, 2026, cut the cap in Section 21-215 from 18 percent to 9 percent, so any county page or packet still quoting 18 percent is pre-amendment text. The winner pays the full amount due, plus per parcel sale fees (commonly $104: indemnity, advertising, clerk, treasurer automation and sale in error fund charges), on the day of sale, and receives a certificate of purchase.
• Redemption runs through the county clerk, and the penalty is the return. Under Section 21-350 as amended, the standard redemption period is now 3 years from the sale; it is 1 year if on the sale date the property is vacant non-farm, has a structure with seven or more residential units, or is commercial or industrial. Certificates issued from January 1, 2024 to July 9, 2026 run the prior 2.5 year track, which the holder can extend under Section 21-385 to no later than 3 years. The owner redeems at the clerk's office by paying the certificate amount plus the penalty at the bid rate for each six month period elapsed (the Section 21-355 schedule: the penalty once in the first six months, then two, three, four, five and six times it as the periods run). A redeemed certificate pays the buyer back with that penalty; that is the normal exit.
• The deed is a second, separate case. Only after redemption expires unredeemed can the certificate holder petition the circuit court for a tax deed, serving the statutory notices the Code requires. Until that deed issues, the buyer holds a lien position: no possession, no rents, and a defined set of sale in error risks that can unwind a purchase. Price an Illinois certificate as a timed claim with a court case at the end of it, not as a property purchase.

How bidding works in Cook County

Register online at cooktaxsale.com during the registration window and fund the collateral deposit so it is received by the deadline; late collateral means no bidding. On sale days, plan to be in the Sale Room at 118 N. Clark Street, because the platform accepts final bids only from those computers.

• The penalty is the price. The lowest penalty percentage wins, and the penalty is earned per six month period, so a 9 percent bid redeemed in month seven pays twice what the same bid pays in month five. At a 0 percent bid the buyer earns nothing on redemption and is working only for the deed path. Model the redemption track (3 years standard, 1 year for the exception classes) before the number.
• The certificate is not the property. No possession, no rents, no right to enter. The return is the penalty when the owner redeems through the county clerk, or a deed at the end of a court petition if nobody does. Buyers who need the property itself should be reading the Michigan pages, not this one.

Terms: what a bid actually costs

What does not sell, and the scavenger sale

Parcels that draw no bid at the annual sale are re-offered on the re-offer day, Monday, December 21, 2026. Beyond that, Cook's leftover channel is the Section 21-260 scavenger sale, the cash sale for parcels three or more years delinquent, but it exists only when the County Board directs one: the last closed March 2, 2022 and the Treasurer lists none scheduled. Confirm the current channel with the Treasurer before relying on either.

Before you bid

• Know the redemption track before the penalty. Three years standard against 1 year for vacant non-farm, seven or more unit, commercial and industrial parcels is the difference between two holding strategies, and the track is set by the property on the sale date, not by the buyer's preference.
• Read the current statute, not the county FAQ. County pages still showing an 18 percent penalty predate P.A. 104-553. For sales after July 10, 2026 the cap is 9 percent and the standard redemption period is 3 years; where a county page and the Code disagree, the Code governs.
• Registration closes earlier than you think. The statutory floor is 10 business days, and counties close sooner: Will County's deadline fell before its judgment hearing, and DuPage closed registration on October 30 for a November 19 sale. A buyer who starts with the sale list has usually started too late.
• Price the deed path honestly. Notices, a court petition, and sale in error risk sit between a certificate and a deed, and redemption is the common exit. Set the maximum before the sale opens; the free Max-Bid Calculator below works backwards from your exit value.

Every Illinois county in this set

One page per county, each verified against its own treasurer, clerk or statute source. Illinois has 102 counties; this set is the top 20 by population and sale volume.

• Cook County (this page)
• DuPage County tax sales
• Lake County tax sales
• Will County tax sales
• Kane County tax sales
• McHenry County tax sales
• Winnebago County tax sales
• Madison County tax sales
• St. Clair County tax sales
• Sangamon County tax sales
• Champaign County tax sales
• Peoria County tax sales
• McLean County tax sales
• Rock Island County tax sales
• Kendall County tax sales
• Tazewell County tax sales
• LaSalle County tax sales
• Kankakee County tax sales
• Macon County tax sales
• DeKalb County tax sales

Keep going

Once a deadline puts you in a sale, the Land Investor Due Diligence Toolkit is the checklist and bid worksheet to run on each parcel before you bid. The same desk runs Florida tax deed sales, Texas tax sales, Pennsylvania tax sales, Georgia tax sales, North Carolina tax foreclosure sales, Ohio tax foreclosure sales, Illinois tax lien sales and Michigan tax foreclosure sales, and the proven New York season, with the live membership, sits in the NY tax sale hub.