Illinois Property Tax Calculator
Estimate Illinois property tax by county using the latest effective rates — compare counties and the 1.88% state average.
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How to use this calculator
- 1
Enter your home value.
- 2
Choose your county, or the Illinois state average.
- 3
If you know your own effective rate, enter it to override the selection.
- 4
Read the estimated annual and monthly property tax.
Frequently asked questions
What is the average property tax rate in Illinois?
The average effective property tax rate on owner-occupied homes in Illinois is 1.88%, which ranks 2 of 50 states from highest to lowest. The US average is 0.9%, so Illinois is $980 higher per $100,000 of value; the median state is 0.79%.
How much is property tax on a $300,000 home in Illinois?
At the 1.88% Illinois average the estimate is $5,640 a year, or $470 a month. At the US average rate the same home would be $2,700, which is $2,940 less than the Illinois estimate.
Which Illinois county has the highest property tax rate?
Among the large counties listed here, Lake County has the highest effective rate at 2.68% and Madison County the lowest at 1.93%. That is $10,708 against $7,700 a year on a $400,000 home.
How does Illinois compare with the other big states on this site?
Of the eight largest state pages, Illinois ranks 2nd by effective rate. New Jersey is highest at 1.88% and California lowest at 0.7%; Illinois is at 1.88%.
How is property tax calculated in Illinois?
Illinois has one of the highest effective property tax rates in the country. Bills are set by local taxing districts, so the same home value can produce very different taxes in different counties.
Why can my real bill differ from this estimate?
Even within Illinois, listed county rates run from 1.93% in Madison County to 2.68% in Lake County, and city, school district, exemptions, assessment caps and reassessments change what you owe. The county numbers are medians, so a rate you work out from your own Illinois bill will be closer.
Which Illinois county is closest to the state average rate?
Madison County, at 1.93% against the 1.88% state average. That is 0.05 percentage points above the Illinois figure.
Can I enter my own property tax rate for Illinois?
Yes. Take the Illinois tax you paid, divide it by the home's market value and enter the percentage in the own-rate box; it overrides the county or state selection.
Illinois property tax — 1.88% average effective rate
Illinois at 1.88%: near the top of the state table
Illinois's average effective property tax rate is 1.88%, which puts it 2nd of 50 states when the table is sorted from highest to lowest (New Jersey shares the same rate). Illinois's rate is 2.09 times the 0.9% US average, or $980 more per $100,000 of value each year. Across the 50 states the median rate is 0.79%; Illinois sits 1.09 percentage points above it, 0 percentage points under the highest (Illinois and New Jersey, 1.88%) and 1.59 percentage points over the lowest (Hawaii, 0.29%).
| Benchmark | Effective rate | Per $100,000 | On $300,000 |
|---|---|---|---|
| Illinois average | 1.88% | $1,880 | $5,640 |
| US average | 0.9% | $900 | $2,700 |
| Median of 50 states | 0.79% | $790 | $2,370 |
| Highest (Illinois and New Jersey) | 1.88% | $1,880 | $5,640 |
| Lowest (Hawaii) | 0.29% | $290 | $870 |
10 large Illinois counties, 1.93% to 2.68%
Lake County has the highest effective rate in the table at 2.68% and Madison County the lowest at 1.93%, a gap of 0.75 percentage points. On a $400,000 home that is $10,708 a year in Lake against $7,700 in Madison, a difference of $3,008. All 10 listed counties are above the 1.88% state average, which suggests the state figure also reflects smaller counties that are not in this table. The county with the lowest median home value, Winnebago County at $155,100, ranks 3 of 10 by rate (2.48%). The priciest county, DuPage County ($374,100), is at 2.09%, ranked 6 of 10.
| County | Median home value | Median property tax paid | Effective rate | Tax on $400,000 | Per month on $400,000 |
|---|---|---|---|---|---|
| Lake County | $326,600 | $8,743 | 2.68% | $10,708 | $892 |
| McHenry County | $286,900 | $7,153 | 2.49% | $9,973 | $831 |
| Winnebago County | $155,100 | $3,850 | 2.48% | $9,929 | $827 |
| Kane County | $303,000 | $7,230 | 2.39% | $9,544 | $795 |
| Will County | $298,000 | $6,993 | 2.35% | $9,386 | $782 |
| DuPage County | $374,100 | $7,833 | 2.09% | $8,375 | $698 |
| St. Clair County | $168,800 | $3,533 | 2.09% | $8,372 | $698 |
| Cook County | $305,200 | $6,053 | 1.98% | $7,933 | $661 |
| Sangamon County | $170,300 | $3,369 | 1.98% | $7,913 | $659 |
| Madison County | $167,900 | $3,232 | 1.93% | $7,700 | $642 |
What 1.88% means per $100,000 of Illinois home value
At the Illinois average every $100,000 of value carries about $1,880 of tax a year, or $157 a month. Using county rates the same $100,000 slice costs $1,925 in Madison County and $2,677 in Lake County. Among the eight largest state pages, Illinois is number 2 from the highest, with New Jersey at 1.88% and California at 0.7% as the two ends. Each $50,000 of value changes the Illinois estimate by $940 a year.
Illinois property tax at $150,000 to $750,000
Applying the 1.88% Illinois rate, the estimate runs from $2,820 a year ($235 a month) on a $150,000 home to $14,100 a year ($1,175 a month) on a $750,000 home. A $500,000 Illinois home comes to $9,400, or $783 a month if the tax is collected through escrow.
| Home value | Per year | Per month | Versus US average |
|---|---|---|---|
| $150,000 | $2,820 | $235 | +$1,470 per year per year |
| $300,000 | $5,640 | $470 | +$2,940 per year per year |
| $500,000 | $9,400 | $783 | +$4,900 per year per year |
| $750,000 | $14,100 | $1,175 | +$7,350 per year per year |
What the Illinois estimate does and does not cover
This page multiplies a home value by an effective rate, so the Illinois answer is an estimate from averages and 10 county medians, not a bill. Assessed value, exemptions, caps, local levies, assessment ratios and appeals decide a real bill and are not modelled; the $3,008 county gap on a $400,000 house shows how much local detail matters. If you know your Illinois effective rate, enter it to override the selection. Rates are the Tax Foundation 2026 tables built from 2024 American Community Survey data, so they are only as current as that label, and your county assessor or tax collector sets the actual bill.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →