State of Illinois income tax rate increased to 4.95 percent. The Illinois Income Tax rate for individuals has increased from 3.75 percent (.0375) to 4.95 percent (.0495), effective July 1, 2017.
http://www.revenue.state.il.us/TaxRates/Income.htm
Read below for more information:
http://www.revenue.state.il.us/Publications/Bulletins/2018/FY-2018-01.pdf
