2027 Property Tax Due Dates
Varies (Cook Co.: March 1)
First installment (varies by county)
Varies (Cook Co.: August 1)
Second installment
Payment Methods
Online, Mail, In-Person
Randolph County Treasurer
Phone
(618) 826-5000 8How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Randolph County Treasurer
In Person
Visit the Treasurer's office
About Property Taxes in Illinois
Illinois has one of the most distinctive property tax systems in the country: taxes are paid one year in arrears. This means the taxes you pay in 2025 are for the 2024 tax year. This delayed billing cycle can catch new homeowners off guard — when you purchase a home in Illinois, you will typically receive a credit at closing for the prior year's unpaid taxes. Property taxes in Illinois are administered at the county level. County assessors (or township assessors in some areas) set property values, the county board of review hears appeals, the county clerk calculates tax rates, and the county treasurer bills and collects. Tax rates vary significantly depending on the number of overlapping taxing districts — counties, municipalities, school districts, park districts, fire protection districts, and others — affecting your property.
Payment & Assessment
Illinois property taxes are generally paid in two installments, though timing varies by county: Cook County: First installment: Due March 1 Second installment: Due August 1 Other counties: Many follow a June and September schedule, but dates vary. Contact your county treasurer for exact due dates. Late payments accrue interest at 1.5% per month (18% annually). If taxes remain unpaid for an extended period, the county may sell the tax lien to investors at an annual tax sale, which can ultimately lead to loss of the property if the lien is not redeemed. Most counties offer online payment through the county treasurer's website. Contact your county treasurer to confirm whether partial payments are accepted.
Statewide framework for Illinois. Your county's specific rates and deadlines are shown above.
Other Counties in Illinois
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.