What to know before starting an online appeal:
- An email address is required. The email address used to create the account is how you will be emailed your Filing ID (used to access your online account), and your CCAO Appeal Docket Number (used to reference your appeal in the CCAO).
- If you wish to supply documents (such an appraisal or RPIE filing) or comparable properties with your appeal, they must be submitted WITH the appeal at the time of the appeal filing. They can NOT be submitted AFTER your appeal has been submitted.
- You will only be able to submit your filing when your property’s township is open for appeals (view our Reassessment and Appeal Calendar). Once you start your filing, you can save a draft, modify it, and upload attachments before submitting your filing.
- Only submitted filings will be received by the CCAO. Filings that have been drafted need to be submitted before the appeal filing deadline for that property’s township.
- The results of your appeal will be sent by postal mail (not email).
- The Official Appeal Rules of the Cook County Assessor apply to the entire appeal process. Filers must read and adhere to these rules.
- When the subject of an appeal is an income-producing property, in whole or in part, it is also required to file the Real Property Income & Expense (RPIE) statement. See below.
- There are different kinds of appeal filings. If your appeal is not for a home or condo, is suggested that you read the list below to see what kind of filing you should submit.
What kinds of CCAO appeal filings can be submitted online?
In 2020, online appeal filings are available for:
- Residential properties (homes)
- Condo/Co-Op (residential and commercial)
- Commercial/Industrial properties
- Class 3 apartment buildings with more than 6 units:
- if the property is a condominium, please use the online Condo/Co-Op Online Appeal. Otherwise, please use the online Commercial Online Appeal.
- Class 4 Not-For-Profit properties
- Please use the Commercial Online Appeal and be sure to specify in the Appeal Narrative that you are seeking Class 4 status.
Class 5 Commercial/Industrial properties
- Incentive properties
- Omitted assessments
- For Type of Appeal, please check the box for Other and then write “Omitted assessment” in the box that appears. Upload any relevant documents in the Attachments section. Be sure to file anonymized versions of each document intended for an analyst.
For all property types, please note that if you wish to file a Certificate of Error only for current or past years, this filing cannot currently be submitted online.
I think my home was not assessed uniformly. How do I find comparable properties to compare my home's assessment to theirs?
Homes that are comparable (similar) to each other should have similar market values, and therefore similar assessed values. One way to evaluate whether your home has been assessed fairly, or uniformly, is to compare its assessment to the assessment of other comparable homes.
Learn more: What are Comparable Properties?
Or: Find Comparable Properties (including how to submit up to PINs of up to 6 comparable properties with an appeal)
The Real Property Income & Expense (RPIE) form is a tool developed for owners of income-producing properties to report income, expense, and vacancy information about their buildings.
Filing is voluntary, and information submitted helps us accurately capture the real estate market conditions for all properties in a region. Note that an RPIE statement is required for an appeal when the subject of an appeal is an income-producing property, in whole or in part, per Rule 20. An online filing is required if:
- the income from this property was reported to the IRS on a Schedule E or Form 8825, or:
- the lessee of this property was party to a net or triple net lease, and therefore is responsible for the property's real estate taxes
If the property type is not supported by the online form, PDF forms are available.
What other guides are available from the CCAO for appeals?
- Online appeal FAQs (3 page pdf)
- Online appeal extensive documentation (50 page pdf)
- Common reasons for residential appeals for single-family homes (Residential Appeals)
For general questions and information about appeals, including how to file, please send us a message via the General Contact page on our website.
For specific questions regarding errors using the online system, email firstname.lastname@example.org.
How do I start my Online Appeal with the Cook County Assessor’s Office?
What happens after I submit my online appeal?
You will receive email confirmation of your filing, and a second email that contains your appeal docket number used to reference your appeal in the Office. Our analysts will process your appeal, make a decision about whether to adjust or not adjust your property's assessed value.
The results of the analyst's decision will be sent to you in the mail.
Please note: due to a database issue, some emails are being sent with different appeal information. Though the email may have contained incorrect information, please know that your appeal information is secure and confidential.
To check on the status of your appeal:
- Go to https://propertytaxfilings.cookcountyil.gov/
- Log in.
- Click on My Filings.
- You will be able to review your appeal information.
All first installment bills are, by law, 55% of the total taxes paid the previous year. Any changes in assessment from the previous year, and all exemptions, appear on second installment bills sent in the summer.
If you experience issues with the online appeal system, please email email@example.com.
Where do I find my PIN?
Your 14-digit Property Index Number (PIN) is printed on your tax bill, your property closing documents and deed, and notices from the Assessor's office (such as your assessment notice).
Enter PIN to see property details
Don’t know the property’s PIN? Search by address.