Companies including AbbVie, Walgreens and Horizon Pharma are pursuing or considering inversions because the potential federal tax savings could run into the billions.  But what about Illinois?  Any action that reduces a company’s federal income tax liability ought to cut its state income tax bill.

http://www.chicagobusiness.com/article/20140716/BLOGS10/140719880/sure-tax-inversions-squeeze-uncle-sam-but-what-about-illinois#