When are property taxes due in Boone County, Illinois?

Boone 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 Boone County, Illinois?

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

How do I pay Boone County, Illinois property taxes?

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

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Boone County Property Tax Due Date

Illinois

(815) 544-2666

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

Boone County Treasurer

Phone

(815) 544-2666

How to Pay

Online

Pay using credit card or e-check

Visit Website →

By Mail

Mail check payable to Boone County Treasurer

Visit Website →

In Person

Visit the Treasurer's office

Visit Website →

Other Counties in Illinois

Adams Alexander Bond Brown Bureau Calhoun Carroll Cass

View all Illinois counties →

About Boone County

Boone County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 53,448. Its county seat is Belvidere.

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

Related Resources

CountyRollCounty Office Directory

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Property Tax FAQ Tax Calendar

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