Boone County tax bills and the October 29 tax sale
Your Boone County tax bill depends on your tax code. Homes are assessed at one-third of market value, and in Belvidere the 2025 rate works out to roughly 2.65 percent of a home's market value before exemptions. Rates elsewhere in the county run a bit lower or higher. Boone doesn't border Cook County, so the general homestead exemption here is up to $6,000 of assessed value. For 2025, all nine townships had an equalization factor of 1.0000, so nothing extra was added on top of the assessor's number.
Unpaid taxes go to the Treasurer's annual tax sale, which happens only once a year. The last one, on Oct. 30, 2025, offered 278 parcels, and 223 were sold. The next is set for Thursday, Oct. 29, 2026. At the sale, a buyer pays the taxes and gets a lien, not the house. You can generally redeem for up to 3 years, but the buyer can ask the court for a tax deed about 2.5 years after the sale, so waiting is costly. Seniors under $75,000 in household income can file Form PTAX-340 each year to freeze their assessed value, which can matter if you're weighing whether to hold or sell.
Foreclosure in the 17th Circuit and its free mediation program
Every Illinois mortgage foreclosure goes through court. Boone County shares the 17th Judicial Circuit with Winnebago County. The circuit runs a Residential Mortgage Foreclosure Mediation Program that's voluntary and free for homeowners with a residential foreclosure case filed in Boone or Winnebago County. To opt in, you apply at ilforeclosureprogram.org or file a Boone County Motion for Referral to Mortgage Foreclosure Mediation.
State law sets the clock. Your right to redeem, by paying the full amount, runs until the later of 7 months from service or 3 months from the judgment, and it ends before the sale. After the sale, the court holds a hearing to confirm it. The Illinois foreclosure timeline and the deadline calculator walk through reinstatement, confirmation and possession step by step. If you're thinking about selling, find out where your case stands on that clock before you pick a route.
Belvidere, Poplar Grove, Candlewick Lake and the villages
Boone County has about 53,230 residents. Owners live in about 82 percent of occupied homes, and about 6 percent of housing units are mobile homes, so check whether a mobile home is titled with the land before you list. Belvidere is the county seat and largest city, with Poplar Grove, Capron and several smaller villages around it. Loves Park and Cherry Valley reach into Boone County, but most of both lie in Winnebago County, so check which county holds your parcel.
Candlewick Lake is an unincorporated community run by the Candlewick Lake Association. Annual dues are due May 1. At 50 days past due the association places a lien with a $100 fee, and at 60 days the account goes to its attorney, so plan on clearing any unpaid dues or lien at closing.
What a $268,000 Boone County sale costs to close
Illinois REALTORS reports a median sale price of $268,000 for Boone County in the second quarter of 2026, down 1.7 percent from a year earlier, on 117 closed sales, down 20.9 percent. That's about 80 percent of the statewide median of $335,000. Here's a rough look at what comes out of that price on a traditional listing:
- Agent commission at about 4.9 percent (Clever's Illinois average, updated September 2026): roughly $13,100
- Closing costs at about 1.2 percent: roughly $3,200
- State transfer tax at $0.50 per $500: about $268
- Boone County transfer tax at $0.25 per $500: about $134
That's roughly $16,700 before your mortgage payoff, repairs or months of carrying costs. The Illinois closing costs page explains the state stamp and who usually pays it. If the property is a fit, a cash buyer may make an offer and you pick the closing date. Listing with an agent is also a fine choice, especially for a move-in-ready house. If you're facing a deadline, see the pages on selling to stop a foreclosure and selling an inherited house.
Boone County's neighbors and nearby pages
Boone County doesn't have its own town pages yet, so here are the closest local pages in the Rockford area and next door.
- Winnebago County: shares the 17th Judicial Circuit and its foreclosure mediation program
- Rockford: the Rockford metro's Q2 2026 median sale price was $224,500
- McHenry County: eastern neighbor; a Cook border county with an $8,000 homestead exemption
- DeKalb County: southern neighbor; like Boone, it gets the $6,000 homestead exemption
- All Illinois pages: the statewide directory of county and city pages
Sources: Boone County tax sale information; Boone County 2025 rates by tax code; Boone County 2025 assessment preamble; Boone County tax relief exemptions; 35 ILCS 200/21-350; 17th Circuit mortgage foreclosure program; 735 ILCS 5/15-1603; Census Reporter, Boone County profile; Candlewick Lake collection policy; Illinois REALTORS Q2 2026; Clever commission survey; Boone County Code, Chapter 70 Taxation