DeKalb County tax bills and the October tax sale
Property taxes are a big part of the cost of owning here. The median DeKalb County homeowner pays about $5,974 a year in real estate taxes, according to Census survey data. Rates depend on your tax code. For the 2025 tax year, the City of DeKalb's main code (DK21) carries a total rate of 7.89915 per $100 of equalized assessed value, and two of Sycamore's codes carry rates of about 6.91 and 7.43. Homes are assessed at one-third of market value, so the DK21 rate works out to roughly 2.6 percent of a home's value before exemptions. The 2025 taxes were due June 3 and Sept. 3, 2026, and late installments pick up penalties.
The county holds its tax sale once a year. The last posted sale was Monday, Oct. 27, 2025, at the County Administration Building on East Sycamore Street in Sycamore, and the Treasurer lists Oct. 23, 2026, as the last day to pay 2025 taxes. At the sale, only the unpaid taxes are sold, not the house, and you can generally redeem for up to 3 years through the County Clerk. Values also shift. The 2026 equalization factors raised assessments by an average of 7.29 percent across the county's 19 townships (8.44 percent in DeKalb Township). The deadline to appeal a 2026 change is Oct. 13, 2026.
Foreclosure cases at the Sycamore courthouse
Every Illinois mortgage foreclosure goes through court. Here that means the 23rd Judicial Circuit, which DeKalb shares with Kendall County, and cases are filed through the Circuit Clerk in the historic courthouse in downtown Sycamore. The 23rd Circuit's local rules list a family mediation program, but the rules index shows no foreclosure mediation program, so plan on working with the lender, a housing counselor or a lawyer directly.
The deadlines come from state law. Your right to redeem, by paying off 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 still has to confirm it before the buyer can take possession. The Illinois foreclosure timeline and the deadline calculator walk through each step, including reinstatement and the possession date.
From NIU rentals to Hinckley and Kingston
The market changes a lot from one town to the next. The city of DeKalb, home to Northern Illinois University, has far more renters than the rest of the county; the DeKalb page has the numbers. Zillow puts the typical home value in the city of DeKalb at about $263,000, the lowest of the main towns. Sycamore, the county seat, has typical values near $323,000. Genoa (about $322,000) and Sandwich (about $330,000) sit close to Sycamore, Kirkland and Malta land in the $280,000s, and Hinckley (about $349,000) and Kingston (about $341,000) top the list.
Countywide, owners occupy about 61 percent of homes and about 5 percent of housing units sit vacant. Some towns cross county lines, including Sandwich, Somonauk, Lee and Maple Park. If your house is near one of those lines, confirm which county holds the parcel for taxes, recording and court.
Running the numbers on a $315,000 DeKalb County sale
Illinois REALTORS reports a median sale price of $315,000 for DeKalb County in the second quarter of 2026, on 313 closed sales. 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 $15,400
- Closing costs at about 1.2 percent: roughly $3,800
- State transfer tax at $0.50 per $500: about $315
- DeKalb County transfer tax at $0.25 per $500: about $158
That's roughly $19,700 before your mortgage payoff, repairs or months of holding costs. Sellers usually pay the transfer tax by custom, though it can be negotiated. 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 weighing options under a deadline, the page on selling to stop a foreclosure lays them out, and so does the guide to selling an inherited house.
DeKalb County pages and nearby counties
Here's where to find local pages for DeKalb County and the counties around it.
- DeKalb: NIU's home city, mostly renters, lowest typical values of the main towns
- Kendall County: shares the 23rd Judicial Circuit courts with DeKalb County
- Kane County: borders DeKalb to the east; Maple Park straddles the line
- McHenry County: borders DeKalb to the northeast; its tax sale falls in mid-November
- Boone County: borders DeKalb to the north; the 17th Circuit runs a free foreclosure mediation program
- Winnebago County: borders DeKalb to the northwest; foreclosures go to the Rockford courthouse
- All Illinois pages: the statewide directory of county and city pages
Sources: DeKalb County Treasurer; DeKalb County delinquent tax sale information; DeKalb County tax rates by tax code 2025; DeKalb County 2026 equalization factors; 35 ILCS 200/21-350; Census Reporter, DeKalb County profile (ACS 2020-2024); Local Rules of the 23rd Judicial Circuit; 735 ILCS 5/15-1603; Zillow Research, home values (ZHVI); Illinois REALTORS Q2 2026; Clever commission survey; Clever, Illinois transfer taxes