cook-il

Cook County, Illinois — Tax Sale & Surplus Procedure

Local operations layer. The legal framework (redemption periods, surplus rights, statutes, case law) lives on the parent page → illinois. This page covers how Cook County actually runs it. Legal information, not legal advice. Last verified: 2026-06-01.

MAJOR FLUX WARNING (2025–2026). Cook County is the epicenter of Illinois’s tax-sale reform. A federal court held the Cook County tax-sale system unconstitutional under the Fifth and Eighth Amendments (bell-v-pappas-2025), the General Assembly’s HB4537 reform passed in May 2026, and a separate bill (SB 3940) would replace tax-certificate sales with court-ordered foreclosure auctions. The 2024 Annual Tax Sale (Tax Year 2022) that opened December 10, 2024 was the most recent completed sale; the next statutorily-required sale was postponed from March 2025 to March 2026, and the Treasurer’s office was actively lobbying the legislature to amend the statute to postpone it further. Confirm the live sale status before relying on any calendar item below.

C0. Identity

• County seat: Chicago. Population: ~5.1 million (most populous Illinois county; 3-million-plus county under 35 ILCS 200, which triggers the higher Cook County indemnity-fee schedule — see illinois §3).
• Recording unit: county. Note: the Recorder of Deeds office was abolished effective December 7, 2020; all recording functions were absorbed by the Cook County Clerk. https://www.cookcountyclerkil.gov/recordings/search-recordings
• Parent legal framework: illinois

C1. Local Tax Sale

• Conducts own sale? Yes — the Cook County Treasurer (Maria Pappas), as ex officio county collector, conducts the Annual Tax Sale and the Scavenger Sale. See treasurer-sale.
• Platform / vendor: County-run online auction at www.cooktaxsale.com (not RealAuction/GovEase/ Bid4Assets). Registration, collateral deposits, and stored bids are handled online; final bid placement on sale days is made only from computers in the Treasurer’s Sale Room, Room 112 (Randolph St. entrance), 118 N. Clark St. https://www.cooktaxsale.com · https://cookcountypropertyinfo.com/taxsale.aspx
• Calendar / frequency: Annual Tax Sale held once per year (historically spring; recently delayed). The Annual Tax Sale sells the prior tax year’s delinquencies. Scavenger Sale (parcels 3+ years delinquent) held periodically.
  • Historical Annual Tax Sale dates (by tax year, per the County portal): TY2017 → 5/3/2019; TY2016 → 5/4/2018; TY2015 → 4/3/2017; TY2014 → 6/3/2016; TY2013 → 8/3/2015. https://cookcountypropertyinfo.com/taxsale.aspx
  • Most recent completed: TY2022 Annual Tax Sale opened 8:30 a.m. December 10, 2024. Next known: statutorily required March 2026 sale (postponed from March 2025), status in flux pending reform legislation (see flux warning). https://www.cookcountypropertyinfo.com/newsarticle.aspx?articleid=2113 · https://chicago.suntimes.com/2026/02/12/plans-are-underway-to-get-rid-of-cook-countys-property-tax-sales-in-the-coming-years
• Bidding method / rate: bid-down-the-penalty per illinois §1 (statutory per-period penalty cap). Rate is set by statute, not by county ordinance.
• Registration & deposit: Registration completed online at cooktaxsale.com during a posted window (for the TY2022 sale: Nov. 8–27, 2024). A collateral deposit must be received by the Treasurer’s Office by the registration deadline (TY2022 deadline: 5:00 p.m. Chicago time, Nov. 27, 2024). Exact current deposit amount/percentage — needs_verification. https://www.cooktaxsale.com · https://www.cookcountytreasurer.com/annualtaxsale.aspx
• Bidder requirements: online registration + collateral deposit; final bids placed only from the Treasurer’s Sale Room computers on sale days. Tax-buyer eligibility/affidavit details — needs_verification.
• Delinquent / sold list location: The Treasurer publishes the Annual Tax Sale results (sold list) broken down by ward/municipality/township, with PIN, taxpayer name, address, amount sold, and classification, at https://www.cookcountytreasurer.com/annualtaxsaleresults.aspx; also published as open data at https://datacatalog.cookcountyil.gov/Property-Taxation/Treasurer-Annual-Tax-Sale/55ju-2fs9. Current delinquency/sold status searchable via the Cook County Clerk at https://taxdelinquent.cookcountyclerkil.gov/.

C2. Local Redemption → framework: right-of-redemption

• Where/how to redeem locally: After a tax sale, redemption is handled by the Cook County Clerk — Real Estate & Tax Services Division, NOT the Treasurer. The owner orders an Estimate of the Cost of Redemption from the Clerk, then pays the Clerk; the Clerk distributes to the certificate holder. https://www.cookcountyclerkil.gov/property-taxes/tax-redemption
• Order an Estimate of Redemption (online): https://www.cookcountyclerk.com/service/estimate-redemption (linked from the County portal). Owners are urged to obtain the estimate immediately after a sale.
• Local fees / timing note: If the sale is not redeemed before the point ~5 months prior to the end of the redemption period, Cook County Sheriff service- of-notice charges may be added to the redemption cost. Exact fee schedule — needs_verification. https://www.cookcountyclerkil.gov/property-taxes/tax-redemption
• Redemption contact / payment venue: Cook County Clerk’s Office, Real Estate & Tax Services Division, Cook County Building, Room 434, 118 N. Clark St., Chicago, IL 60602, 312-603-5656, Mon–Fri 9 a.m.–5 p.m. https://www.cookcountyclerkil.gov/property-taxes/tax-redemption/redemption-payments
• Deviations from state default: Statutory redemption periods/multipliers are the illinois state defaults (no local deviation). The Cook-specific operational point is the Treasurer-sells / Clerk-redeems split of duties.

C3. Local Surplus / Excess Proceeds → framework: surplus-funds

• No traditional surplus pool on the tax side. As explained on illinois §3, an Illinois tax sale generates no excess-proceeds fund — the tax buyer pays only the delinquency and, on non-redemption, takes a deed to the whole parcel. The former owner’s historical remedy in Cook County is the Indemnity Fund. This is the exact mechanism held unconstitutional in bell-v-pappas-2025.
• Claim filing venue (Indemnity Fund): Petition filed in the Circuit Court of Cook County (the court that ordered the tax deed to issue), naming the Cook County Treasurer, as trustee, as defendant. Recovery is paid from the Indemnity Fund administered by the Treasurer. (35 ILCS 200/21-305; see illinois §3.) https://www.cookcountytreasurer.com/pdfs/forms/doapplication.pdf
• Claim form: The Cook County Treasurer publishes an indemnity/duplicate- overpayment application form at https://www.cookcountytreasurer.com/pdfs/forms/doapplication.pdf. The exact form title and whether it is the operative indemnity-fund petition vs. a refund/overpayment application — needs_verification (the indemnity claim is a court petition, so practitioners typically file a circuit-court petition rather than a one-page form).
• Local deadline notes: Indemnity petition must be filed within 10 years after the tax deed issued (35 ILCS 200/21-305; see illinois). Cook County has a documented backlog of unpaid indemnity judgments (270 judgments / $25M+ as of March 2022), so payout timing lags the judgment. https://www.justice.gov/osg/brief/united-states-v-county-cook-petition
• Unclaimed-funds list published? No dedicated tax-sale “surplus/unclaimed” list exists because no surplus is generated under the historical model. Post- bell-v-pappas-2025 / HB4537, a surplus-equity fund for owners who lost property in the prior ~2 years is being created; whether Cook will publish a claimant list — needs_verification.
• Contact: Cook County Treasurer’s Office, 118 N. Clark St., Chicago, IL 60602, 312-443-5100. https://www.cookcountytreasurer.com/

C4. Offices & Contacts

Office	Name	Address	Phone	URL
Treasurer / Tax Collector	Cook County Treasurer (Maria Pappas)	118 N. Clark St., Room 112, Chicago, IL 60602	312-443-5100	https://www.cookcountytreasurer.com/
Clerk (Tax redemption + recording)	Cook County Clerk — Real Estate & Tax Services Div.	Cook County Building, Room 434, 118 N. Clark St., Chicago, IL 60602	312-603-5656	https://www.cookcountyclerkil.gov/property-taxes/tax-redemption
Recorder / Register of Deeds	Abolished 12/7/2020 — merged into Cook County Clerk	(recording via Clerk)	312-603-5656	https://www.cookcountyclerkil.gov/recordings/search-recordings
Circuit Court (tax deed / indemnity petitions)	Clerk of the Circuit Court of Cook County	50 W. Washington St., Chicago, IL 60602	— (needs_verification)	https://www.cookcountyclerkofcourt.org/ (needs_verification)
Sheriff (serves tax-deed/redemption notices)	Cook County Sheriff	—	—	—

C5. Local Procedure Notes

• Treasurer-sells / Clerk-redeems split: The Treasurer conducts the sale and holds the indemnity fund; the Clerk computes redemption and takes redemption payments (Room 434). This division of labor is the single most important Cook- specific operational fact.
• Recorder merged into Clerk (2020): all deed recording and document searches now run through the Cook County Clerk’s Recordings system, not a standalone Recorder of Deeds.
• County-run auction platform (cooktaxsale.com) rather than a third-party vendor — registration window and Sale Room (Room 112) are county-controlled.
• Constitutional flux: bell-v-pappas-2025 (system held unconstitutional), HB4537 (surplus-equity reform), and SB 3940 (proposed move to foreclosure-auction model) make Cook the highest-uncertainty county in Illinois. The next required sale (March 2026) was being actively contested/postponed by the Treasurer. https://chicago.suntimes.com/2026/02/12/plans-are-underway-to-get-rid-of-cook-countys-property-tax-sales-in-the-coming-years

C6. Records Access

• Property / parcel + tax search (PIN-based): Cook County Property Tax Portal https://www.cookcountypropertyinfo.com/ · property records search https://crs.cookcountyclerkil.gov/Search
• Recorded deed / document search: Cook County Clerk Recordings https://www.cookcountyclerkil.gov/recordings/search-recordings
• GIS / tax maps: CookViewer https://maps.cookcountyil.gov/cookviewer/ · Clerk GIS & Tax Maps https://www.cookcountyclerkil.gov/property-taxes/gis-and-tax-maps
• Tax payment portal: Cook County Treasurer https://www.cookcountytreasurer.com/ (online e-check free; card ~2.10% fee)
• Delinquent tax search (Clerk): https://taxdelinquent.cookcountyclerkil.gov/

C7. Meta

• sources:
  • {type: county_official, url: “https://cookcountypropertyinfo.com/taxsale.aspx”, retrieved: 2026-06-01} # tax sale definitions, historical dates, redemption=Clerk
  • {type: county_official, url: “https://www.cooktaxsale.com”, retrieved: 2026-06-01} # online auction platform / Sale Room Rm 112
  • {type: county_official, url: “https://www.cookcountytreasurer.com/annualtaxsale.aspx”, retrieved: 2026-06-01} # online sale, collateral deposit, registration
  • {type: county_official, url: “https://www.cookcountytreasurer.com/annualtaxsaleresults.aspx”, retrieved: 2026-06-01} # sold list publication
  • {type: county_open_data, url: “https://datacatalog.cookcountyil.gov/Property-Taxation/Treasurer-Annual-Tax-Sale/55ju-2fs9”, retrieved: 2026-06-01} # annual tax sale open dataset
  • {type: county_official, url: “https://www.cookcountypropertyinfo.com/newsarticle.aspx?articleid=2113”, retrieved: 2026-06-01} # tax sale postponement news
  • {type: county_official, url: “https://www.cookcountyclerkil.gov/property-taxes/tax-redemption”, retrieved: 2026-06-01} # redemption handled by Clerk, sheriff-charge note
  • {type: county_official, url: “https://www.cookcountyclerkil.gov/property-taxes/tax-redemption/redemption-payments”, retrieved: 2026-06-01} # Room 434, 118 N Clark, 312-603-5656, hours
  • {type: county_official, url: “https://www.cookcountyclerk.com/service/estimate-redemption”, retrieved: 2026-06-01} # order estimate of redemption online
  • {type: county_official, url: “https://taxdelinquent.cookcountyclerkil.gov/”, retrieved: 2026-06-01} # delinquent property tax search
  • {type: county_official, url: “https://www.cookcountyclerkil.gov/recordings/search-recordings”, retrieved: 2026-06-01} # Recorder merged into Clerk 12/7/2020; recordings search
  • {type: county_official, url: “https://www.cookcountyclerkil.gov/property-taxes/gis-and-tax-maps”, retrieved: 2026-06-01} # GIS & tax maps
  • {type: county_official, url: “https://maps.cookcountyil.gov/cookviewer/”, retrieved: 2026-06-01} # CookViewer GIS
  • {type: county_official, url: “https://crs.cookcountyclerkil.gov/Search”, retrieved: 2026-06-01} # property records search
  • {type: county_official, url: “https://www.cookcountytreasurer.com/”, retrieved: 2026-06-01} # treasurer payment portal / contact 312-443-5100
  • {type: county_form, url: “https://www.cookcountytreasurer.com/pdfs/forms/doapplication.pdf”, retrieved: 2026-06-01} # treasurer application form (indemnity/overpayment - title to verify)
  • {type: court_filing, url: “https://www.justice.gov/osg/brief/united-states-v-county-cook-petition”, retrieved: 2026-06-01} # indemnity fund petition mechanics, backlog
  • {type: news, url: “https://chicago.suntimes.com/2026/02/12/plans-are-underway-to-get-rid-of-cook-countys-property-tax-sales-in-the-coming-years”, retrieved: 2026-06-01} # SB3940 wind-down, March 2026 sale status
• needs_verification:
  • Current collateral deposit amount/percentage and exact tax-buyer eligibility/affidavit requirements for the Annual Tax Sale. Reason: the cooktaxsale.com/Treasurer pages describe the process but the live numeric deposit was not captured (cookcountytreasurer.com returned TLS/403 to the fetcher; facts came from search snippets of the same official pages).
  • Live status of the March 2026 Annual Tax Sale (held, postponed, or superseded by reform). Reason: in active legislative flux as of the retrieved Feb. 2026 reporting.
  • Exact title/purpose of the Treasurer form doapplication.pdf (indemnity- fund vs. duplicate/overpayment refund). Reason: PDF could not be fetched (TLS error); indemnity recovery is fundamentally a circuit-court petition.
  • Clerk of the Circuit Court of Cook County phone/URL for filing tax-deed and indemnity petitions. Reason: not independently retrieved from an official page in this pass.
  • Whether a post-reform surplus-equity claimant list will be published by Cook County under HB4537. Reason: bill just enacted/awaiting implementation.
  • Cook Sheriff service-of-notice fee schedule added to redemption cost.
• cross_links: illinois, right-of-redemption, surplus-funds, third-party-recovery-rules, treasurer-sale, bell-v-pappas-2025, tyler-v-hennepin-county, county-collector-blossom63-2022, due-process-notice
• changelog:
  • 2026-06-01 — initial autoresearch population from Cook County Treasurer, Cook County Clerk (redemption + recordings + GIS), cooktaxsale.com, the County property portal/open data, the U.S. v. County of Cook OSG petition (indemnity mechanics), and Feb. 2026 reform reporting.

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Disclaimer: This page is legal information, not legal advice. Tax-foreclosure law and county procedure change frequently — and Cook County’s system is in active constitutional and legislative reform. Verify every fact against the cited official sources and consult a licensed Illinois attorney before acting. Last verified: 2026-06-01.