Boone County Tax Information

Boone County will host its Annual Delinquent Property Tax Sale Auction on Thursday, October 30, 2025, at 9:00 AM. This event will take place in the Boone County Administration Campus, Courtroom 2D, located at 1212 Logan Avenue, Belvidere, IL 61008. At this sale, we will auction tax lien certificates for delinquent property and mobile home taxes from 2023. This sale does not transfer the title to real estate; instead, it allows the lien holder to earn interest until the property owner redeems the property.

Key Auction Details

Date: October 30, 2025
Location: Boone County Administration Campus, 1212 Logan Ave, Belvidere, IL 61008
Time: 9:00 AM (CDT)
Registration Deadline: October 16, 2025
Registration Fee: $250 (non-refundable unless no purchases are made)

Terms of Sale

Submit the registration fee along with a completed Single Bidder Affidavit and IRS Form W-9.. You can download the form from the Boone County Treasurer’s Office website.

Bidding starts at 9% interest and will be conducted in person using the Real Time Auction Management System (R.A.M.S.). The tax sale certificate is awarded to the bidder offering the lowest interest rate. You can view a tutorial on R.A.M.S. here.

Tax buyers are responsible for paying the full amount of taxes, penalties, and fees owed on the properties they successfully bid on the same day. Accepted forms of payment include cash, personal/business checks, cashier’s checks, or money orders.

How to Participate

Register: Complete the Certificate of Registration form and submit it with the $250 deposit and IRS Form W-9 by October 16, 2025. All forms can be accessed on the Boone County Treasurer’s website.

Check-In: Check in on the morning of the sale (by 8:30 AM), bringing a signed blank check for the taxes owed on any property you successfully bid on.

Bid In-Person: Attend the sale in the traditional open-outcry format. You or your registered representative must be physically present to place bids.

Additional Information

The Boone County Treasurer’s office will publish a list of available tax liens in local newspapers and on its website about three to four weeks before the sale. You can purchase a PDF version for $70, which includes a printed update on the day of the sale.

The sale is final and takes place once a year.

Boone County purchases any unsold liens on behalf of the taxing districts.

Links you might need for the Boone County, Illinois, Tax Auction:

• Boone County Tax Sale Information Link 
• Boone County Treasurer’s Office
• Boone County In-Person Auction Site
• How to Profit from Illinois’s Tax Lien Sales
• Learn How Does Tax Lien Investing Work
• Want to get started with Tax Liens? Click Here!
• Is Illinois the best place to profit from tax lien certificates?

The Boone County tax auction presents an excellent opportunity to purchase tax lien certificates on properties at competitive rates. Investors can earn interest on their investments or potentially acquire properties through foreclosure after the redemption period. Ensure you register early, research the property list carefully, and bring the required forms for a smooth auction experience​

For additional questions about the redemption process, contact the Boone County Clerk’s Office at 815-544-3103.

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