Do-it-yourself appeal research
How to appeal your Cook County property taxes without a lawyer
Cook County lets homeowners submit an Assessor appeal and supporting documents online, and its rules do not require attorney representation.
By Check the County, operated by Embento LLC. Updated September 19, 2026. This is general public-record research information, not legal, tax or appraisal advice.
What does it cost to file for yourself?
The county filing fee is $0. You do not need a percentage-of-savings arrangement to submit your own appeal. Optional research or professional services are separate choices, not county filing requirements.
What an owner needs
- Your PIN: use the property identification number for the property you are reviewing.
- Accurate property facts: confirm the county record's property type, class, building size, age, lot and other relevant characteristics.
- Evidence: gather support for the issue you want the office to review, such as appropriate comparable sales or a documented property-record error.
- The right filing window: confirm that the relevant township is open before submitting.
- The right office: an Assessor filing and a Board of Review filing are separate. Filing with one does not file with the other.
Our guide to the Assessor and Board of Review explains the two opportunities. The comparable-sales guide explains how to evaluate sales evidence.
Set realistic expectations
An appeal may not change the assessment. Even when an assessment changes, that change is not a promise of a particular tax-bill amount. The bill can depend on factors beyond the assessment itself, so do not treat an assessment argument as a savings forecast.
Use the township appeal guides to find local filing-window status and evidence context, and verify the current requirements with the county office receiving the appeal.
When might professional help still make sense?
Some owners may prefer professional help when the property or ownership is complicated, the evidence is difficult to organize, they manage multiple properties, they want representation, or they do not have time to prepare and track the filing themselves.
If you choose help, understand what the provider will do, what it will cost and whether you remain responsible for any filing step. Homeowners who prefer to research and file for themselves can start with our Cook County appeal research overview.