CountyTax

Illinois property tax rates by county

Illinois · #2 of 52 · 102 counties

2.01%state benchmark

Median annual property tax $5,298 · median home value $263,300

Above the U.S. benchmark 0.94%. Payment dates are set locally — see below. Payment dates ↓

Same house, different county

Apply each county's benchmark rate to a $263,300 home, the Illinois median: about $6,796 a year in Lake County (2.58%) versus $3,756 in Randolph County (1.43%) — $3,040 a year apart for the same house. Counties with at least 20,000 people.

Where most Illinois residents live

CountyRateMedian taxOf income
Cook County#41 of 1021.91%$6,1917.4%
DuPage County#24 of 1022.05%$8,0077.1%
Lake County#1 of 1022.58%$8,9238.1%
Will County#9 of 1022.24%$7,1736.5%
Kane County#8 of 1022.26%$7,3827.2%

Of income = median annual property tax ÷ median household income (all households, owners and renters), ACS 2020–2024 5-year. A real bill depends on the assessed value and exemptions, not only the rate.

Counties, highest rate first

When it's due in Illinois

All states

Payment dates vary by local tax authority.

Check your city, town or county tax collector for this year's deadline. The statewide notes below are a general guide.

Late penalty1.5% interest per month on delinquent amounts (35 ILCS 200/21-15, 21-20)
Appeal windowwithin 30 days of assessment publication with county Board of Review (35 ILCS 200/16-55)

county-set; dual statutory system under 35 ILCS 200/21-15: Cook County 1st installment due March 1 and 2nd installment due August 1 (or 30 days post-mailing); other 101 counties typically due June 1 and September 1. Regular annual schedule; tax year: prior year assessment, bills mailed winter & summer. Source: 35 ILCS 200/21-15, 21-20, rules checked 2026-09-19. Confirm the amount and deadline on your official tax bill.

Benchmark = median real estate taxes paid ÷ median home value, ACS 2020–2024 5-year. Counties where the Census reports a range ("less than $200", "$10,000 or more") get no rate.