New Assessor data shows burden shift of 2023 reassessment appeals

Thursday, June 27, 2024

News Social Media

The Cook County Assessor’s Office (CCAO) has released a new set of Data Dashboards for townships and municipalities showing the effect of appeals with the Cook County Board of Review (BoR) on assessed values during the 2023 reassessment cycle.

In the 2023 reassessment cycle, properties in the south and west suburbs were reassessed. The updated property values are reflected on the second installment property tax bills that are online and will hit mailboxes in early July.

Prior to the reassessment, residential property made up 68% of total assessed value, while non-residential made up 32%. After the CCAO set values and processed appeals in the south and west suburbs, homeowners’ share would have dropped slightly, to 67%. Because share of assessed value can correspond to share of tax burden, a drop in homeowners’ share could mean a drop in the share of tax burden.

However, the CCAO is not the final arbiter of assessments in Cook County – the BoR has the ability to change property values during the appeals process.

Following appeals with the BoR, the residential share of total assessed value increased to 71%. This was mainly because of appeals granted to non-residential properties: In total, the assessed value of non-residential property decreased $950 million, or just over 18%, during the BoR appeals stage.

These changes in the distribution of the property tax burden could affect many of the second installment tax bills issued to homeowners in the coming weeks. Assessed values are used to calculate the tax base for individual taxing districts that, together with the levy, determine the tax rate. (Other factors, such as Tax Increment Financing districts, exemptions, the multiplier, and the “recapture” provision, also affect tax rates.)

As a result of BoR appeals, homeowners in many parts of the south and west suburbs will take on a larger share of the tax burden – and a greater increase in their property taxes – than they would have under the CCAO’s values.

Appeal shifts in the south and west suburbs

Variations within townships

Appeal changes varied significantly between each of the 17 townships that were part of the 2023 south suburban triennial reassessment. But the same pattern held throughout – in each township, homeowners saw their share of assessed value increase following appeals with the BoR.

In Bloom Township, which includes Chicago Heights and Lynwood, residential property made up 65% of assessed value before the reassessment. The CCAO’s assessments increased total assessed values across the township by about $215 million, and decreased homeowners’ share of this value to 64%.

In townships where residential property makes up the vast majority of the tax base, changes on appeal were less drastic but followed the same trend as elsewhere. In River Forest Township, for example, homeowners increased from 88% to 90% of the share of assessed value following appeals with the BoR.

In individual south and west suburban municipalities, many of the same patterns held. Chicago Heights, Stickney, and Phoenix all saw homeowners take on a share of assessed values that was 9-10 percentage points greater under the Board of Review’s final values than the CCAO’s. It was only in Ford Heights that residential property’s share of value decreased following BoR appeals.

About the CCAO Data Dashboards

Data Dashboards are created by the Assessor’s Office to allow viewers to review assessments at each stage of the assessment process. In the first stage, the CCAO sets values and processes appeals. In the second and final stage, the Board of Review adjusts those values based on appeals filed in their office. The Dashboards provide a clear view of how the tax burden is split between residential and commercial property owners. They also show the burden shifts at each stage.

The CCAO has released Data Dashboards since 2020 for townships and municipalities within Cook County. To explore all the publicly available data, visit