Are you missing exemptions on your property tax bill?

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Cook County Assessor's Office

September 17, 2021

Are you missing exemptions on your property tax bill?

Missing Exemptions

As homeowners in Cook County have now received their 2020 Second Installment Tax Bills (tax bill) in the mail they are encouraged to look at the bottom left corner to ensure that the correct exemption(s) are applied. 

If a homeowner believes they are entitled to an exemption that is not reflected on their tax bill, they can apply for what is called a Certificate of Error. The Certificate of Error process provides homeowners an opportunity to redeem missing exemptions for up to three years in addition to the current tax year. Homeowners can now apply for 2020, 2019, 2018, and 2017 tax years. 

Certificate of Error applications with copies of supporting documentation can be filed online, by mail, or in person. Homeowners are strongly encouraged to apply online as representatives from the Assessor’s Office can easily provide updates on the status of applications. 

As a reminder, homeowners are responsible for paying the entirety of the tax bill to the Cook County Treasurer’s Office by October 1, 2021. If the Certificate of Error application is granted, either a corrected tax bill or a refund for the difference will be issued. 

Apply Online

Certificate of Error Process

Upcoming In-Person and Online Events

Our office is partnering with local elected officials to host office hours across Cook County.  Please view our event page to see a list of in-person and virtual events to receive property tax assistance. Homeowners can also schedule in-person appointments at our regular offices. 

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20th Ward Office Hours- Alderman Chris Taliaferro
Monday, September 20, 2021
10:00AM - 4:00PM
6272 W North Ave , Chicago, 60639

Schedule an Appointment


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1st Ward Office Hours- Alderman Daniel La Spata
Tuesday, September 21, 2021
10:00AM - 4:00PM
1958 N Milwaukee Ave , Chicago, 60647

Schedule an Appointment


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Property Tax Assessment Forum-Chicago Metropolitan Alumnae Chapter
Thursday, September 23, 2021
6:00PM - 7:00PM Facebook Live

More Information 


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24th District Office Hours- State Representative Elizabeth Hernandez
Tuesday, September 28, 2021
1:00PM - 6:00PM
6117 West Cermak Road , Cicero, 60804

More Information

Award Photo

Assessor’s Office Wins Public Information Award

“We launched both the online appeal and exemption systems just prior to Illinois’ Stay at Home order due to COVID-19,” said Assessor Kaegi. “The communications team was tasked with teaching the public how to conduct business with the office in an entirely different way at the height of the pandemic.”

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Talk with Toni

Racial Equity Week: Talk with Toni

The third annual Cook County Racial Equity Week takes place this week from September 13-17. This year's them reflects on the three words: "Imagine. Intersect. Act." The County has programmed a week of events that probe the audience to use their imaginations to understand justice and equity issues at the intersections of identities and encourage all to take action. As a part of the weeklong activities, Cook County President Toni Preckwinkle invited Assessor Kaegi to join her on an episode of Talk with Toni to discuss racial equity and the property tax system. 

Watch Episode