Available Filings

• Annual Exempt Affidavit or Change Filing (2025)
  This filing is only for exempt properties pursuant to 35 ILCS 200/15-10. This filing can also be used to report any changes throughout the 2024 assessment year.
• Apply for Certificates of Error for Exemptions (2024)
  For tax years 2020-2023
• Apply for a 2024 Exemption by filing a Certificate of Error
  This application is for homeowners applying for exemptions for tax year 2024. The normal filing period has ended, and you are now submitting a Certificate of Error. The Certificate of Error process provides homeowners an opportunity to redeem missing exemptions for the current tax year. If you are approved, the savings from the exemption will either appear on the second installment tax bill or an adjusted tax bill that will be mailed shortly after.
• Apply to Renew your 2024 Low-Income Senior Freeze Application by filing a Certificate of Error
  This application is a new feature for homeowners who received the Low-Income Senior Freeze Exemption last year and need to reapply for the 2024 tax year. The purpose of this filing is to make the process quicker for homeowners who simply need to update their information from the previous year. The normal filing period has ended, and you are now submitting a Certificate of Error. The Certificate of Error process provides homeowners an opportunity to redeem missing exemptions for the current tax year. If you are approved, the savings from the exemption will either appear on the second installment tax bill or an adjusted tax bill that will be mailed shortly after.
• Apply to Renew your 2024 Veterans with Disabilities Exemption by filing a Certificate of Error
  This application is a new feature for homeowners who received the Veterans with Disabilities Exemption last year and need to reapply for the 2024 tax year. The purpose of this filing is to make it quicker for homeowners who simply need to update their information from the previous year. The normal filing period has ended, and you are now submitting a Certificate of Error. The Certificate of Error process provides homeowners an opportunity to redeem missing exemptions for the current tax year. If you are approved, the savings from the exemption will either appear on the second installment tax bill or an adjusted tax bill that will be mailed shortly after.
• Assessment Appeal for Vacant Land Properties (2025)
  All vacant and unimproved real estate (class 1).
• CCAO Permits - Entry (2025)
  CCAO - Municipality and Township Permits Entry (2025)
• CCAO Permits - Entry by the City of Chicago (2025)
  CCAO - City of Chicago Permits Entry (2025)
• CCAO Valuations - 2025 Residential Property Characteristics Update
  Cook County Assessor's Office 2025 Residential Property Characteristics Update
• Commercial Assessment Appeal (2025)
  Commercial and industrial (class 5), apartment buildings with 7 or more units (class 3), Not-for Profit (class 4) properties.
• Condo/Coop Assessment Appeal (2025)
  For condominium parcels.
• Incentive Property Assessment Appeal (2025)
  In order to file an incentives appeal an incentive eligibility application must be on file and deemed eligible.
• Omitted Property Assessment Appeal (2025)
  For omitted assessments.
• Residential Assessment Appeal (2025)
  All single-family homes, town homes, multi-family residential buildings and mixed-use property with no more than six units (class 2)
• Secondary Attachments for Existing Appeal (2025)
  Filers can submit additional documents to a submitted appeal as long as the Town is still open.