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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in DeKalb County, Illinois

DeKalb County has an effective property tax rate of 2.45%. On the median home value of $243,600, that's roughly $5,974 per year. Median household income is $70,724.

Effective Property Tax Rate1
2.45%
median tax $5,974 ÷ median home $243,600
Median Home Value1
$243,600
owner-occupied
Median Household Income1
$70,724
per-capita $36,298
Est. Annual Tax on Median Home1
$5,974
at 2.45% effective rate

What you'll pay, at a glance

Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.

MetricDeKalb CountyIllinois (state context)
Effective property tax rate12.45%1.80%
Median home value1$243,600—
State income tax3top rate 4.95%top rate 4.95%
State sales tax38.98% combined8.98% combined

How this is calculated

The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.

About DeKalb County, IL

Buying in DeKalb County means weighing a lower purchase price against a steeper tax bill. The median home here costs $243,600, well below what many Illinois counties command, but the effective property tax rate of 2.452% ranks second among the state's 102 counties and sits above Illinois's 1.804% median. That combination produces a median annual tax bill of $5,974. With median household income at $70,724 and per-capita income of $36,298, taxes claim a meaningful share of earnings each year. Nationally, the picture looks sharper still, since the U.S. median effective rate is just 0.794%. Communities like DeKalb, along with Clare and Cortland, anchor the county. For a buyer, the tradeoff is clear: cheaper entry prices, but budget carefully for the recurring tax obligation that comes with them.

Frequently asked questions

What is the property tax rate in DeKalb County, IL?
The effective rate is 2.45% — meaning the median tax bill equals about 2.45% of the median home value.
How much are property taxes on a median home?
On the median home ($243,600), the estimated annual bill is about $5,974.
Is DeKalb County's rate high or low?
Compare it to the state median of 1.80% and the national average near 1.1%.
How does the effective rate differ from my mill rate?
A mill rate is the nominal levy per $1,000 of assessed value. The effective rate reflects what you actually pay after exemptions and assessments — it's the median tax bill as a share of median home value, so it better predicts your real cost.
Will a reassessment raise my tax bill?
Not necessarily. If your home's assessed value rises, your bill can go up, but only if the mill rate and exemptions stay flat. Contact the DeKalb County assessor's office to review your current assessment.
Can I appeal my property tax assessment?
Yes. Most counties allow an appeal when you believe the assessed value exceeds the market value. File with the DeKalb County assessor within the local deadline, typically with comparable sales as evidence.
Sources
[1] U.S. Census Bureau — ACS 5-Year (2023) — Median home value (B25077), median real-estate taxes (B25103), median household income (B19013), per-capita income (B19301).
[2] IRS — Statistics of Income — County income, AGI, and real-estate taxes paid.
[3] Tax Foundation — State income, sales, corporate, and estate/inheritance tax rates.