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Assessments

The Illinois system for appealing property assessments provides several opportunities for taxpayers to have incorrect or inaccurate assessments corrected. These options include:

An Informal Appeal at the Township Assessor Level: The Rockford Township Assessor's Office is expected to have accurate information on file for all properties within our jurisdiction; however, mistakes can happen. If you believe that there is an error or discrepancy in the information about your property that affects the assessment amount, please get in touch with the Assessor's Office. Calling attention to an error early allows for adjustments to be made quickly and without using the formal appeal process. This process could involve a visit from your Deputy Assessors to measure or verify the information provided. Important to note is that corrections at this level are that - record corrections. The Assessor's Office can not make adjustments based on opinions of value. 

A Formal Appeal to the County Board of Review: If you believe that your property is not valued correctly, and have verified that the information on file at the Assessor's Office is accurate, you may file a formal complaint to the County Board of Review. A Formal Complaint can only be filed within 30 days of assessments being published (typically late summer.) Assessments for 2025 were published on July 30, 2025 . For more information about filing an appeal, please see our frequently asked questions. For more information about the Winnebago County Board of Review, visit the website here.

Appeal to the Illinois Property Tax Appeal Board: If you are still unsatisfied with the Winnebago County Board of Review's decision of your assessed value appeal/complaint AFTER filing a formal appeal, you can appeal the assessment to the State Property Tax Appeal Board (PTAB). This appeal must be filed within 30 days of your Board of Review decision date and is submitted using the portal on the PTAB website.. For more information, please visit the website here.