Winnebago County, IL tax sales
How tax lien certificate and tax deed sales work in Winnebago County, seat of Rockford: sale calendar, auction platform, over-the-counter lists, and the offices that run each sale.
Verified Jul 30, 2026 against official county and state sources.
New here? Read how Illinois tax sales work, the difference between a lien and a deed, and redemption periods.
How Winnebago County sells delinquent taxes
Tax certificate sale (lien)
- Run by
- Winnebago County Treasurer's Office (the County Treasurer serves as ex officio County Collector and runs the annual tax sale)
- Frequency
- annual
- Typical timing
- Late October to early November. The Treasurer's office states the sale is "typically held last week of October or early November," with the exact dates set by the Treasurer each year. The county FAQ describes delinquent taxes being offered at a tax sale "At the end of October."
Registration and deposit
Only registered tax buyers may attend. The registration form is "not available online," so request it from the Treasurer's office by phone at (815) 319-4400 or by email at [email protected]. Registration requires two separate checks payable to "WINNEBAGO COUNTY TREASURER": a $500.00 registration fee, which is applied toward taxes purchased but forfeited if you do not attend or are not an active bidder, and $200.00 for the delinquent property listing showing the parcels going to tax sale. First-time buyers must also provide a letter from their bank noting they are good up to a certain dollar amount. The registration window is short and depends on when the sale is scheduled, so contact the office well before late October.
Winnebago County runs its annual tax sale as a live, in-person auction. The Treasurer's office states that "There are no phone or internet bids accepted," so no online auction platform applies here and no platform is confirmed for this county. Bidding is a reverse auction on the penalty rate: registered tax buyers bid a percentage rate capped at 9%, and the caller accepts the lowest bid to win. The delinquent parcel list is not published free online; the Treasurer sells it to registered buyers for $200.00 as part of registration, and parcel-level tax history is searchable through the Treasurer's Parcel Tax Details Inquiry site. Once the sale closes, all delinquent tax records move to the County Clerk's Tax Extension and Redemption office at (815) 319-4253, which computes redemption amounts, accepts certified funds only (cash, money order, or cashier's check for the exact amount payable to the County Clerk), and issues tax deeds. Confirm the current year's sale date and registration cutoff with the Treasurer's office before planning a bid. In person, live outcry auction at the county (no online bidding platform)
Tax deed sale
- Run by
- Sheriff or a court-appointed private selling officer, under an order of the circuit court. A county acting as trustee runs its own tax deed auctions.
- Frequency
- as ordered by the circuit court
- Typical timing
- Within 120 days after the court order authorizing the auction. Public Act 104-0553 created this route for tax certificates issued on or after July 10, 2026, so the earliest Illinois judicial tax deed auctions fall in 2027, after the 1 year short redemption track runs.
Registration and deposit
Terms of a judicial tax deed auction, including whether it runs online, in person, or both, and what deposit is required, are set in the court's order and published in the notice of tax deed auction. That notice runs once a week for 3 consecutive weeks, starting no more than 45 days and ending no less than 7 days before the auction. Read the notice for each parcel; there is no statewide platform or standing bidder registration.
Bidding opens at the tax deed judgment amount plus 0.75 percent per month since judgment, plus publication and selling officer costs. The petitioning certificate holder is entered as a credit bidder at that minimum. Surplus above the minimum goes to the county treasurer for the former owner to claim.
Over-the-counter (leftover) purchases
Certificates nobody bids on at the annual sale are forfeited to the county as trustee for the taxing districts. The county may then assign a forfeited certificate to any party or sell property it has acquired, which many counties handle through a delinquent tax agent rather than a public counter. Counties may also offer county-held certificates at a scavenger sale with a minimum bid of $250, or half the tax when total liability is under $500. Ask the county collector and the county clerk which program the county runs and who may buy.
New to this path? Read how over-the-counter certificates work.
County offices
Tax Collector (runs the certificate sale)
Winnebago County Treasurer's Office
Winnebago County Treasurer, 404 Elm Street, Rm 205, Rockford, IL 61101
Official websiteNotes for Winnebago County
- The Treasurer's office describes its duties as including work to "register, process, call and balance our annual tax sale," confirming the Treasurer runs the sale rather than an outside vendor.
- Bids are penalty-rate bids capped at 9%, and the low bid wins.
- The $500.00 registration fee is credited toward taxes purchased but is forfeited if the registrant does not attend or does not bid actively.
- Redemption after the sale is handled by the County Clerk's Tax Extension and Redemption office at (815) 319-4253, not by the Treasurer.
- The County Clerk's page and the Clerk's tax redemption page list different room numbers in the 404 Elm Street administration building, so verify the room before mailing a redemption payment.
Illinois statewide rules
- Redemption
- Property sold at an Illinois tax sale may be redeemed at any time before the redemption period expires. Public Act 104-0553 set the standard period at 3 years from the date of sale for tax certificates issued on or after July 10, 2026. Certificates issued between January 1, 2024 and July 9, 2026 run on the earlier 2.5 year (30 month) track, and on that track the certificate holder could file a written notice with the county clerk extending redemption to a date no later than 3 years from the sale. A short 1 year period applies when the parcel was, on the date of sale, vacant non-farm property, commercial or industrial property, or improved with a structure holding 7 or more residential units. Certificates the county holds or assigns as trustee run on their own schedule under Section 21-385, and an assignee must file notice within 60 days of assignment setting a redemption deadline no later than 3 years from the assignment.
- Deed deposit
- Illinois does not fix a statutory deposit percentage. Deposit and payment terms are set in the court's order authorizing the auction and by the selling officer, so read the notice of tax deed auction for each sale. A purchaser who fails to complete the sale forfeits any deposit already made to the county surplus equity fund, and the court orders a new auction of the property.
- Surplus proceeds
- Any amount by which the winning bid exceeds the minimum bid is surplus. Within 30 days after the court confirms the sale the selling officer deposits the surplus with the county treasurer, who notifies everyone who received the Section 22-10 take notice that the owner at the time of the sale may file a claim for it. A county running its own tax deed auction deposits surplus with the treasurer within 30 days of the sale and notifies interested parties within 60 days. Separately, a previous owner who lost equity through a tax deed can claim an award from the county surplus equity fund, capped at the value of the property when the deed issued less mortgages, liens, and the taxes the purchaser paid.
A tax deed does not convey marketable title. Most buyers file a quiet title action before they can resell or insure the property. See the due diligence guide.
Frequently asked questions
Does Winnebago County, Illinois sell tax liens or tax deeds?
- Winnebago County follows Illinois's tax lien state system.
When is the Winnebago County tax certificate sale?
- Late October to early November. The Treasurer's office states the sale is "typically held last week of October or early November," with the exact dates set by the Treasurer each year. The county FAQ describes delinquent taxes being offered at a tax sale "At the end of October.". Registration and bidding happen on the county's online platform. Always confirm the exact date with the Tax Collector before the sale.
How often does Winnebago County hold tax deed sales?
- as ordered by the circuit court. Each sale is scheduled and advertised in advance, so check the county's tax deed calendar for the next posted date.
Tax Sale Atlas publishes educational information about public tax sale processes. This is not legal, financial, or investment advice. Rules, dates, and fees change; confirm with the county office before you bid.
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