When are property taxes due in DeKalb County, Illinois?

DeKalb 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 DeKalb County, Illinois?

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

How do I pay DeKalb County, Illinois property taxes?

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

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DeKalb County Property Tax Due Date

Illinois

(815) 895-7112

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

DeKalb County Treasurer

Phone

(815) 895-7112

How to Pay

Online

Pay using credit card or e-check

Visit Website →

By Mail

Mail check payable to DeKalb County Treasurer

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In Person

Visit the Treasurer's office

Visit Website →

Other Counties in Illinois

Adams Alexander Bond Boone Brown Bureau Calhoun Carroll

View all Illinois counties →

About DeKalb County

DeKalb County is a county located in the U.S. state of Illinois. As of the 2020 United States census, the population was 100,420. Its county seat is Sycamore.

Source: Wikipedia — content available under CC BY-SA 4.0

Related Resources

CountyRollCounty Office Directory

Find the assessor, treasurer & recorder for DeKalb

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Property Tax FAQ Tax Calendar

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We'll email you 14 days before your property taxes are due.

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