Illinois Property Tax Calculator 2026

Calculate property taxes in Illinois. The average effective property tax rate in IL is 1.79%, which is above the national average of 0.89%. Estimate your annual property tax bill.

By Konstantin Iakovlev · Updated October 19, 2026 · Methodology

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Annual Property Tax

$6,265.00

Monthly Equivalent

$522.08

Effective Rate

1.790%

Property Tax Breakdown

Assessed Value$350,000.00
Homestead Exemption$0.00
Taxable Value$350,000.00
Annual Tax$6,265.00
Monthly Equivalent$522.08

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

Illinois Property Tax Guide

Property tax is where Illinois lands at the top of the national table. The average effective rate runs about 1.79% of a home's value, roughly double the national norm of around 0.9%, so a house that would carry a modest bill elsewhere can cost thousands of dollars a year here. None of it is set by the state. County or township assessors place a value on each parcel, local taxing bodies such as school districts, municipalities, and park districts adopt their levies, and the county clerk combines those into the composite rate that prints on your bill. Schools lean heavily on this revenue, which is why rates swing sharply between townships.

Estimating a bill means following the assessment chain. Most Illinois counties assess residential property at one-third of fair market value, then a county equalization factor adjusts that toward a uniform level to produce the equalized assessed value. From there, exemptions come off: the general homestead exemption for an owner-occupied primary home, plus targeted relief for seniors, lower-income seniors under an assessment freeze, and veterans with disabilities. To rough out the number, start at market value, scale down to the equalized assessed value, subtract your exemptions, and multiply by the local composite rate the county treasurer publishes.

Illinois Property Tax Details (2026)

Avg. Effective Property Tax Rate 1.79%
National Average 0.89%
vs. National Average 0.9 points above
Estate Tax Yes (exemption: $4,000,000)
State Sales Tax 6.25%
State Income Tax 4.95% (flat)

Official Sources:

Illinois Property Tax FAQ

Why does Illinois sit at roughly 1.79% when the country averages near 0.9%?
Illinois funds local services, public schools above all, through property taxes more heavily than most states. With comparatively little state money flowing to districts, local levies fill the gap and ride directly on home values, lifting the average effective rate to about 1.79%. The same house can therefore carry a far larger annual bill in Illinois than in a state that funds schools differently.
How do I turn a home's market value into an estimated bill?
Begin with fair market value, multiply by the assessment level (one-third in most counties), apply the county equalization factor to reach the equalized assessed value, subtract any exemptions, then multiply by the local composite rate. The composite rate bundles every overlapping district, so your township assessor or county treasurer is the source for that figure. Small shifts in exemptions or rate can move the result noticeably.
What does the general homestead exemption do?
It lowers the equalized assessed value of an owner-occupied primary residence, shrinking the base the local rate is applied to. Illinois layers on additional relief for seniors, an assessment freeze for qualifying lower-income senior owners, and exemptions for veterans with disabilities. You usually apply through the county assessor, and some exemptions renew automatically while others require filing each year.
Does the State of Illinois ever collect property tax directly?
No. Property tax in Illinois is entirely local: assessors set values, taxing districts set levies, the county clerk computes rates, and the county treasurer bills and collects. The state imposes no property tax of its own, which is exactly why rates differ so much between Cook, DuPage, and rural downstate counties.

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