Michigan business tax: credits; election to file a return under the Michigan business tax rather than corporate income tax act under certain circumstances; provide for. Amends secs. 117 & 500 of 2007 PA 36 (MCL 208.1117 & 208.1500) & repeals 2007 PA 36 (MCL 208.1101 - 208.1601 ).  TIE BAR WITH: HB 4190'19 , HB 4191'19