When are property taxes due in Cass County, Illinois?

Cass 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 Cass County, Illinois?

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

How do I pay Cass County, Illinois property taxes?

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

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Cass County Property Tax Due Date

Illinois

2026 Property Tax Due Dates

Installment 1

Varies (Cook Co.: March 1)

First installment (varies by county)

Installment 2

Varies (Cook Co.: August 1)

Second installment

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

Payment Methods

Online, Mail, In-Person

Cass County Treasurer

How to Pay

Online

Pay using credit card or e-check

By Mail

Mail check payable to Cass County Treasurer

In Person

Visit the Treasurer's office

Other Counties in Illinois

Adams Alexander Bond Boone Brown Bureau Calhoun Carroll

View all Illinois counties →

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CountyRollCounty Office Directory

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