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Possible online services disruption due to Internet related outage

A worldwide technology outage is causing disruption to some State of Illinois online systems.  We are aware of this issue and are diligently working on restoration.

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Business Income Tax Rates for Prior Years

Tax Year Ending Corporate Rate Trust and Estate Rate
2015 through June 30, 2017 5.25% 3.75%
2011 through 2014 7.00% 5.00%
1997 through 2010 4.80% 3.00%