Property taxes are useful as a revenue source for governments and the residents they serve; they
reduce the reliance on more regressive taxes, such as the sales tax, and offer a relatively predictable
source of revenue. Property taxes are designed to be progressive taxes, as they “tend to take a
relatively smaller share of income as incomes fall” (Langley & Youngman, 2021).
Unfortunately, studies have shown that some property assessment practices across the United States
create regressive, inequitable systems in which “lower-priced properties are assessed at a higher
proportion of their sale prices than are higher-priced properties” (Berry, 2021).
In a groundbreaking 2017 investigation, researchers with the Chicago Tribune and ProPublica found
that “at least $2.2 billion in property taxes was shifted from undervalued Chicago homes onto
overvalued ones between 2011 and 2015”(Grotto, 2017). These regressive assessments can lead to
“financial breaks to homeowners who are well-off while punishing those who have the least,
particularly people living in minority communities” (Grotto, 2017).
The investigation also estimated that Cook County’s commercial valuation and assessment processes
created a regressive system where “undervaluing expensive downtown buildings while overvaluing
small businesses in poorer neighborhoods” (Grotto & Kambhampati, 2017) was a standard practice.
Assessments, however, are not the only part of the system that create potential inequities. Local
services, such as schools and libraries are funded by property taxes which are based on the value of
nearby properties. Communities with higher “property tax rates generally have low home values, which
drive up the tax rate needed to raise enough revenue” (Kingson, 2023). This situation results in higher
tax rates for people living in areas with lower-value properties and creates potential inequities for
communities which struggle to provide equitable access to services.
Higher tax rates discourage economic investment, even pushing existing businesses out of Cook
County to other communities. The loss of commercial properties and investment further reduces the
tax base and raises the tax rate. This can result in “fewer people paying property taxes, putting even
more upward pressure on the already enormous tax bills for those who do” (Toner, 2018).
This economic disinvestment spiral is primarily felt in the south suburbs, where some communities
have tax rates 400 to 500 percent higher than other communities in the County. For example, the City
of Chicago has a tax rate of 7%, while Park Forest has a tax rate of 41%, a 485% difference. In another
example, “composite property tax rates faced by Dolton homeowners are now more than triple those
in Chicago” (Toner, 2018).
COOK COUNTY PTAX REFORM GROUP
Cook County’s Property Tax System:
Its benefits and pitfalls
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