perhaps "taxes" is the wrong word, revenues would be my point
this article from 2016
http://nprillinois.org/post/illinois...e-tax#stream/0
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3.75%
The state of Illinois has a flat income tax, which means that everyone, regardless of income, is taxed at the same rate. That makes it relatively easy to predict the income tax you will have to pay. As of the 2015 tax year, the income tax rate in Illinois was reduced from 5% to 3.75%.