On June 30, 2016, TEI filed an amicus brief with the U.S. Supreme Court in The Gillette Company v. California Franchise Tax Board, No. 15-1442, also known as the California Multistate Tax Compact ("Compact") litigation. In the 1960s and 1970s, States persuaded Congress and the business community that then-imminent federal legislation mandating uniformity in state taxation was unnecessary because a number of States had enacted the Compact.
On January 5, 2016, TEI filed an amicus brief in support of the taxpayer's application for leave to appeal the Michigan Court of Appeals' decision in Gillette Commercial Operations North America v. Department of Treasury, Case No. 152588, and its four companion cases. Gillette upheld the validity of 2014 PA 282, which the Michigan Legislature enacted to retroactively overrule the Michigan Supreme Court's decision in International Business Machines Corp v Department of Treasury, 496 Mich. 642 (2014).