When are property taxes due in Cook County, Illinois?

Cook County property taxes are due Varies (Cook Co.: March 1). A second installment is due Varies (Cook Co.: August 1). This deadline applies to all counties in Illinois.

What is the penalty for late property tax payment in Cook County, Illinois?

The late payment penalty in Cook County is 1.5% per month starting day after due.

How do I pay Cook County, Illinois property taxes?

You can pay Cook County property taxes via Online, mail, in-person.

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Cook County Property Tax Due Date

Name: Treasurer
Address: 118 N Clark St, Room 112, Chicago, IL, 60602, US
Telephone: (312) 443-5100

Illinois

(312) 443-5100

2026 Property Tax Due Dates

Official Source

Installment 1

Varies (Cook Co.: March 1)

First installment (varies by county)

Installment 2

Varies (Cook Co.: August 1)

Second installment

Pay Taxes Online →

Penalty: 1.5% per month starting day after dueGrace period: None

Payment Methods

Online, Mail, In-Person

Cook County Treasurer

Phone

(312) 443-5100

Office Address

118 N Clark St, Room 112
Chicago, IL 60602

Get Directions

Office Hours

Mon-Fri 8:30am - 5pm

How to Pay

Online

Pay using credit card or e-check

Visit Website →

By Mail

Mail check payable to Cook County Treasurer

Visit Website →

In Person

Visit the Treasurer's office — 118 N Clark St, Room 112, Chicago IL 60602, Mon-Fri 8:30am - 5pm

Visit Website →

Other Counties in Illinois

Adams Alexander Bond Boone Brown Bureau Calhoun Carroll

View all Illinois counties →

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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.