Key Takeaways
- Illinois sells the tax debt, not the house: the county sells a certificate at an annual sale, and you keep title during redemption.
- Redemption is now 3 years: 35 ILCS 200/21-350, as amended by Public Act 104-0553, for certificates issued on or after July 10, 2026.
- Some property gets only 1 year: vacant non-farm property, buildings with 7 or more residential units, and commercial or industrial property.
- Surplus equity goes back to the owner: the 2026 reform brought Illinois into line with Tyler v. Hennepin County (2023).
- Cook County's calendar moved: Public Act 104-0460 pushed the delinquent 2023 sale filing to on or before December 1, 2026.
- The equity gap is the point: the typical Illinois house was worth $299,900 in July 2026 (Zillow ZHVI) against four-figure tax debts.
An Illinois property tax sale does not sell your house. The county sells the unpaid tax debt to a buyer, who receives a certificate and the right to be repaid with a penalty. You keep title and possession, and you keep the right to sell, until a court orders a tax deed.
That structure changed twice in 2026. Redemption moved to 3 years, and surplus equity now returns to the former owner. This guide walks the statute from the bill to the deed petition.
What Is an Illinois Property Tax Sale?
An Illinois property tax sale is the county selling your delinquent tax debt, not your property. A buyer pays the county what you owe, receives a tax certificate, and earns a penalty if you redeem. The house changes hands later, and only by court order.
That makes Illinois a lien state rather than a deed state. The sale starts a clock and puts a private party in position to ask a judge for your deed once the clock runs out.
Two separate sales exist. The annual sale under 35 ILCS 200/21-190 handles ordinary delinquencies. The scavenger sale under 35 ILCS 200/21-260 handles long-standing ones, and there the property itself is sold for the highest amount offered, even below the taxes due.
When Do Illinois Property Taxes Go Delinquent?
Illinois property taxes go delinquent on the later of a fixed statutory date or the day after the date printed on your bill. 35 ILCS 200/21-15 sets the first installment trigger at the later of June 1 or the day after the billed due date. The second installment triggers on the later of September 1 or the day after its own due date.
Illinois bills taxes in arrears in two installments, so the 2025 tax year is billed and paid during 2026. Due dates are set county by county, and downstate calendars rarely line up with Cook County's.
What the interest runs
Outside Cook County, unpaid taxes bear interest at 1.5% per month or portion of a month. Inside Cook County, § 21-15 splits the rate: 1.5% per month for tax years before 2023, and 0.75% per month for tax year 2023 and after.
Cook County's 2026 dates
Cook County second installment bills for tax year 2025 were released September 1, 2026 and are due October 1, 2026 (Cook County government, August 2026). About 1.8 million bills went out. The first installment is a flat 55% of the prior year's total bill.
How the Annual Tax Sale Works
The annual sale runs on publication, a court judgment, and then the sale itself. It does not happen without warning, because each stage carries a statutory notice requirement.
Publication and the application for judgment
After taxes become delinquent, the collector publishes notice of the intended application for judgment and sale under 35 ILCS 200/21-110. The advertisement lists the property index number of each delinquent parcel, plus the address when the collector has one.
Timing comes from 35 ILCS 200/21-150. In counties under 3,000,000 inhabitants, the application is made within 90 days after the second installment due date. Cook County runs a longer schedule, generally within 365 days of that date.
The sale and the penalty rate
Once judgment is entered, the collector conducts the sale under 35 ILCS 200/21-190. 35 ILCS 200/21-215 gives the property to the person offering to pay the amount due "for the least penalty percentage," and caps that penalty at 9% of the tax or special assessment.
What redemption actually costs
The redemption amount is set by 35 ILCS 200/21-355. It starts with the certificate amount, covering tax principal, special assessments, interest, penalties, and the costs and fees of sale.
On top sits the accrued penalty. The certificate amount is multiplied by the penalty rate once for the first six months, twice through twelve months, and so on, reaching six times the rate by the 30-to-36 month window.
Two more items matter. Later taxes paid by the certificate holder carry a 12% penalty for each year or portion of a year, and statutory filing, notice, and title-search fees are added. Only the county clerk can quote the real number.
How Long Is the Illinois Tax Sale Redemption Period?
The Illinois tax sale redemption period is 3 years from the date of sale for most residential property. 35 ILCS 200/21-350 states that property sold at a tax sale "may be redeemed at any time before the expiration of 3 years from the date of sale," with one exception.
That exception is short. Property that was vacant non-farm land, a structure with 7 or more residential units, or commercial or industrial property on the sale date may be redeemed only within 1 year.
The 3-year period comes from Public Act 104-0553 and applies to certificates issued on or after July 10, 2026. Earlier certificates carried the prior 2.5-year period. Several statute mirrors still showed 2.5 years in September 2026, so confirm the text on the General Assembly's own site.
Extension, the take notice, and the deed petition
A certificate holder can push the deadline out but not past the ceiling. 35 ILCS 200/21-385 requires written notice filed with the county clerk, and caps an assignee's extended deadline at 3 years from the date of assignment.
Within 4 months and 15 days after the sale, the purchaser delivers a take notice to the county clerk under 35 ILCS 200/22-5. The form carries a line in capitals: "THIS PROPERTY HAS BEEN SOLD AT A TAX SALE FOR DELINQUENT TAXES." It also states your redemption expiration date.
The last stage is the petition. Under 35 ILCS 200/22-30, the holder may petition the circuit court "at any time within 6 months but not less than 3 months prior to the expiration of the redemption period."
The Illinois Tax Sale Timeline, Step by Step
The full run from a missed installment to a tax deed takes years, not weeks. The table tracks the sequence and the statute behind each step.
| Stage | What happens | Authority |
|---|---|---|
| Billing | Taxes billed in arrears in two installments, on county-specific dates | County collector |
| Delinquency | Later of June 1 or Sept 1, or the day after the billed due date; interest 1.5% a month, 0.75% in Cook for tax year 2023 forward | § 21-15 |
| Publication | Collector advertises the intended application for judgment and sale | § 21-110 |
| Judgment | Application within 90 days of the second installment due date outside Cook; generally 365 days in Cook | § 21-150 |
| Annual sale | Tax debt sold at the least penalty percentage, capped at 9% | §§ 21-190, 21-215 |
| Certificate and take notice | Purchaser delivers the take notice to the county clerk within 4 months and 15 days | § 22-5 |
| Redemption deadline | 3 years from sale for certificates issued on or after July 10, 2026; 2.5 years for earlier certificates; 1 year for vacant, 7-plus-unit, commercial, and industrial | § 21-350 |
| Tax deed petition | Filed within 6 months but not less than 3 months before redemption expires | § 22-30 |
| Surplus | Value above the tax debt and liens returns to the former owner | P.A. 104-0553 |
What Did the 2026 Surplus Equity Reform Change?
Public Act 104-0553 ended the outcome where a tax deed absorbed a whole house over a small debt. Governor Pritzker signed House Bill 4537 on July 10, 2026, effective immediately, describing it as "bringing Illinois into compliance with the U.S. Supreme Court ruling in Tyler v. Hennepin County" (Office of the Governor, July 2026).
Tyler v. Hennepin County, 598 U.S. 631 (2023) held unanimously that a government taking a house over a tax debt cannot keep the surplus value.
The old problem was measurable. Since 2019, tax buyers have taken more than 1,000 owner-occupied Cook County houses worth over $100 million. Most carried an initial tax debt of $1,600 or less (Injustice Watch, June 2026).
| Issue | Before P.A. 104-0553 | After July 10, 2026 |
|---|---|---|
| Residential redemption | 2.5 years from the date of sale | 3 years, for certificates issued on or after the effective date |
| Surplus equity | Kept by the deed holder, with no refund to the owner | Returned to the former owner after the debt and liens are paid |
| Past losses | No recovery mechanism | A surplus equity fund financed by new fees on tax buyers, covering the two most recent sales |
| Cook County pilot | None | Up to 100 low-debt homestead certificates withheld per sale, with reporting to the General Assembly |
| Private tax buying in Cook | Open-ended | Six more sales, then the county acquires all properties offered |
The wind-down sits in the statute. Under § 21-190(c), at the seventh tax sale after the effective date and every sale after that, a county with 3,000,000 or more inhabitants must acquire all properties offered for the total tax amount due. A tax buyer who wants the deed after that transition goes through a court-ordered sale starting at the total delinquent taxes, with any surplus going to the original homeowner (Capitol News Illinois, May 2026).
Cook County Tax Sale 2026 and the Withholding Pilot
Cook County's delinquent tax sale moved by statute before the surplus equity law passed. Public Act 104-0460, effective February 27, 2026, amended § 21-150 so the application for judgment and order of sale for the 2023 annual sale is filed on or before December 1, 2026.
Capitol News Illinois described the change as delaying "the annual Cook County property tax debt sale from March 10 to Dec. 1, 2026" while pausing interest (Capitol News Illinois, February 2026). The statute pauses interest on delinquent 2023 balances between September 2, 2025 and January 1, 2027, and sets April 1, 2027 for the 2024 annual sale.
The withholding pilot
The pilot keeps the smallest cases out of private hands. Counties above three million residents may hold back up to 100 tax certificates on low-debt homestead properties at each sale during a six-year pilot, reporting annually to the General Assembly (Capitol News Illinois, May 2026). Owners in the pilot go onto a payment plan.
Downstate counties keep their own calendars. Winnebago County, which covers Rockford, publishes its schedule through the county treasurer's office. Confirm your county's dates with the treasurer rather than assuming Cook County's apply.
Exemptions and Relief That Shrink the Bill
Reducing the bill is cheaper than redeeming a certificate, and most Illinois relief runs through homestead exemptions. The general homestead exemption under 35 ILCS 200/15-175 reduces equalized assessed value by up to $10,000 in Cook County, $8,000 in counties contiguous to Cook, and $6,000 elsewhere.
Owners aged 65 and over should also look at the low-income senior citizens assessment freeze, which locks the assessed value in place. The income limit is $75,000 or less for tax year 2026, payable in 2027, rising to $77,000 for tax year 2027 (Illinois Department of Revenue, September 2026).
An exemption reduces assessed value, not the bill dollar for dollar. Separately, county clerks may run a payment plan during the redemption period under § 21-385 and waive interest penalties under it.
Selling an Illinois House With Delinquent Property Taxes
You can sell an Illinois house at any point during the redemption period, because the tax sale moved the debt and not the title. The tax claim is paid off at closing from the proceeds, and what remains belongs to you.
How the payoff works at closing
The mechanics are routine for an Illinois title company. The closer orders an estimate of redemption from the county clerk, that amount is paid from the seller's proceeds, the redemption is recorded, and the certificate is released. The estimate is good only through the date it names, so a closing that slips past that date needs a fresh figure.
When a mortgage servicer pays the taxes for you
Most owners with a loan never reach a tax deed, because the servicer advances the delinquent taxes to protect its lien and adds the advance to escrow. Solving the tax problem that way creates a loan problem. A large escrow shortage can raise the monthly payment sharply and push the account into default. Our guide to stopping a foreclosure in Illinois covers the 90-day reinstatement right and the judicial timeline that follows.
What a tax deed used to cost in equity
The numbers explain why the reform happened. Illinois's typical house value was $299,900 as of July 31, 2026, up 5.1% year over year (Zillow ZHVI, July 2026). Chicago stood at $337,993, up 4.5%, Aurora at $326,890, up 2.9%, and Rockford at $186,815, up 9.8%, on the same index and date.
Set those figures against a tax debt in the low thousands. That gap is what a tax deed used to absorb. For more on the state's largest market, see our Chicago housing market analysis for 2026.
Vacant and inherited property carry the shortest clock
Vacant non-farm property gets 1 year instead of 3, which is the most common way owners lose time they assumed they had. Notices also go to a last known address that is often stale. See our guide to selling a vacant house.
Estate property carries the same risk, since bills and take notices go to the decedent's address while heirs sort out authority. If that is your situation, read selling an inherited house in Illinois.
Where a cash offer fits
Propcash is a direct cash homebuyer and makes offers on houses as a principal, so there is no listing, no showings, and no repair list. Sellers pay no fees or commissions, the house is bought as-is, and the seller picks the closing date. Cash transactions need no financing or appraisal, and can close in as few as 7 days.
You can get a cash offer on your Illinois house and compare it against redeeming, refinancing, or listing. Propcash makes one transparent, data-backed offer and shows the reasoning behind the number, with no obligation to accept.
If listing is the better move, Propcash will say so and point you to a local agent who fits. We may receive compensation from agents we refer. You can also see how the process works on our Illinois cash buyer page.
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Let's chatFrequently Asked Questions
How long is the redemption period after an Illinois property tax sale?
Three years from the date of sale for most residential property, under 35 ILCS 200/21-350 as amended by Public Act 104-0553. That period applies to tax certificates issued on or after July 10, 2026, and earlier certificates carried the older 2.5-year period. Vacant non-farm property, buildings with 7 or more residential units, and commercial or industrial property get only 1 year.
Can you sell a house in Illinois with delinquent property taxes?
Yes. An Illinois tax sale moves the tax debt to a certificate holder, not the house, so you keep title through the redemption period. The title company orders an estimate of redemption from the county clerk and pays that amount from the closing proceeds. Whatever remains after the tax debt, mortgage, and closing costs belongs to the seller.
What happens if you do not redeem after an Illinois tax sale?
The certificate holder can ask a court for a tax deed. Under 35 ILCS 200/22-30, the petition is filed within 6 months but not less than 3 months before the redemption period expires. Notice goes to occupants, owners, and other interested parties, and the court directs the county clerk to issue the deed if the taxes are not redeemed.
Do you get the surplus equity after an Illinois tax deed sale?
Under Public Act 104-0553, signed July 10, 2026, an owner who does not redeem receives the surplus left after the tax debt and liens are paid. The act also creates a surplus equity fund, financed by new fees on tax buyers, for owners who lost property at the two most recent sales (Capitol News Illinois, May 2026). Before that law, a tax deed could absorb the entire value of the house.
When is the Cook County tax sale in 2026?
Public Act 104-0460 moved the Cook County annual sale of delinquent 2023 taxes so that the application for judgment and order of sale is filed on or before December 1, 2026. Capitol News Illinois reported the change as moving the sale from March 10 to December 1, 2026 and pausing interest on the debt (Capitol News Illinois, February 2026). The statute sets April 1, 2027 for the 2024 annual sale.
What does it cost to redeem after an Illinois tax sale?
35 ILCS 200/21-355 sets the redemption amount as the certificate amount plus an accrued penalty, any later taxes the certificate holder paid, and statutory fees and costs. The penalty multiplier steps up once for every six-month period that passes, reaching six times the rate set at the sale between 30 and 36 months. Subsequent taxes carry a 12% penalty for each year or portion of a year, and only the county clerk can give you the exact figure.
Data Sources: 35 ILCS 200/21-15 through 22-30 (Illinois General Assembly, read September 2026). Public Act 104-0553 (HB 4537), July 10, 2026. Public Act 104-0460 (HB 598), February 27, 2026. Office of the Governor, July 2026. Capitol News Illinois, February and May 2026. Injustice Watch, June 2026. Cook County government, August 2026. Illinois Department of Revenue, September 2026. Zillow Home Value Index, July 2026. Propcash is a direct cash homebuyer, not a law firm. Owners facing a tax deed petition should consult an Illinois-licensed real estate attorney.