If your property is in Cook County, pay the first property tax installment. If your property is in Cook County, the first property tax installment (55% of the prior year's total bill) is normally due March 1, though the date printed on the bill governs and has moved in some years, and a late payment adds interest of 0.75% per month.
If your property is in Cook County, pay the second property tax installment. If your property is in Cook County, pay the second installment by the due date printed on the bill, which is August 1 in an on-schedule year but has fallen between October and December in years the county issued bills late, because a late payment adds 0.75% interest per month and unpaid taxes can go to the county's annual tax sale.
The Illinois rules
Each rule shows its schedule, its primary sources, and the date it was last verified.
If your property is in Cook County, pay the second property tax installment
Related rules in Illinois
The Illinois guide lists every compliance obligation, the seasonal maintenance calendar, and baseline upkeep.
Open the Illinois landlord guide · Property tax deadlines in every state
What Landautomate does with this page
This guide is the reading version of the Landautomate Illinois rule base. In the app, the same rules become dated tasks on each Illinois property, timed to its purchase date, lease dates, age, and climate, with an email before each one is due. The free preview shows a sample of that schedule for Illinois in under a minute, no account needed.
See this calendar built for your own property
The free preview takes a state and a few property facts and shows the schedule Landautomate would run, no account needed. Every new account starts with a 30-day free Pro trial, no card required.