Cook County, Illinois Tax Sale 2026
Cook County, Illinois has confirmed a lien sale for December 15, 2026 (Annual Tax Sale for tax year 2023 taxes).
Cook County tax sale list
Open the official list →Cook County Treasurer, lists of properties with delinquent tax year 2023 taxes (the December 15, 2026 sale). Free, from the county's own site.
Next sale: December 15, 2026 (Annual Tax Sale for tax year 2023 taxes)
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Looking for money owed, not property?
When a tax-sale property sells for more than the taxes owed, the excess belongs to the former owner until the county’s claim deadline passes. We do not hold surplus records for Cook County yet. We do publish verified surplus-funds lists for other states, each record traced to the official county report it came from, and a free search to see what is listed.
Surplus funds belong to the former owner. Claims are filed directly with the county, and the county does not charge you to claim your own money. This is access to collected public records, not a recovery service and not a claim.
| Status | Confirmed |
|---|---|
| Next possible date | December 15, 2026 (Annual Tax Sale for tax year 2023 taxes) |
| Property list | Posted by official source (see link below) |
| Sale type | Tax lien certificate |
| Platform | cooktaxsale.com (Realauction) / Cook County Treasurer |
| Last verified | 2026-11-05 |
Cook County at a glance
Figures above are drawn from TaxLienSimple's tracked inventory, the county competition model and US Census ACS data; see how we verify.
This is one tracked sale cycle. For Cook County's recurring cadence, platform, legal structure, and other tracked cycles, see the Cook County tax sale hub.
What this page shows: a specific sale date Cook County's own official source has published. It is not a confirmed listing of which properties will be offered that date, always check the official property list. Always confirm directly with the official source below before making plans.
Confirmed sale date: December 15, 2026 (Annual Tax Sale for tax year 2023 taxes)
Time: Not yet stated by the official source.
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Property list
Registration deadline
Not yet stated -- registration requires review of rules/regulations plus collateral or a bond per the Treasurer's Office.
Statutory basis
35 ILCS 200/21
Annual Tax Sale timing set by the County Treasurer's Office; no fixed statutory day-of-month.
Sources, verified 2026-11-05
Watch: researching a lien property
A narrated walkthrough: find tax liens by county, read the Research Score, risk flags and sources, set your maximum bid and save a Deal Radar.
Read the transcript
If you came here for tax liens, start in Property Research and choose Tax Lien.
Liens without a set sale date sit under Timing not assigned yet. That includes over the counter liens you can buy now, with no auction.
Pick a state and a county. I'll use Maricopa County, Arizona.
Tick Mapped only to see each lien on the map, and switch to aerial imagery to look at the property from above.
Open a lien to see the full research.
The Research Score grades it from A to D, out of one hundred, and shows where the points come from.
Estimated value and confidence gives you a value range, and tells you how far to trust it. It's a starting point, not an appraisal.
Risk flags come up before you buy: whether it's still available, liens that may survive, and a source that may be out of date. Open one to see what to check.
The due diligence checklist shows the lien to value ratio and the back taxes, and what you still need to verify yourself.
Sources and freshness links every fact back to the county's own record.
Then calculate your maximum bid. You get a comfortable range, a caution range, and the price where you should stop.
Back in Research, mark it as a bid candidate, and add private notes that only you can see.
Save your search as a Deal Radar, and new matches come to you by email.
That's tax liens: from a county to a lien worth buying, with every fact sourced to the county.
Cook County tax sale, FAQ
When is the next Cook County, Illinois tax sale?
The next Cook County, Illinois tax sale is December 15, 2026 (Annual Tax Sale for tax year 2023 taxes), a specific date published by the county's own official source, not a guaranteed list of which properties will be offered that day.
What platform does the Cook County tax sale use?
Cook County, Illinois runs its lien sale via cooktaxsale.com (Realauction) / Cook County Treasurer. Bid-down interest
What is the redemption period and rate in Cook County, Illinois?
Varies by property type (35 ILCS 200/21). Rate/premium: Penalty bid up to 9% per 6-month period, owed in full even on day 1 (35 ILCS 200/21-215, 21-355).
What this page does not show
Everything above is the sale itself: the date, the platform, the statutory terms and the county's own sources, free and without an account. What it does not show is the property-level detail, or the 409 other county and city sales tracked alongside this one.
- Parcel-level lists where the county publishes one. Opening bids, addresses and assessed values, with the official source on each row.
- The full sale calendar. 410 tracked county and city sales, filterable by date, state and sale type, instead of one page at a time.
- 330,391 parcels across 939 counties. Searchable nationwide, with a research score and the pre-bid warnings behind it.
A free account previews two counties and needs no card. Paid plans start with a 7-day trial for $1.99 and carry a 7-day money-back guarantee. TaxLienSimple is a research platform: we publish the records and the sources, we do not sell properties and we make no claim about what any certificate or parcel is worth.
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