The Multistate Tax Commission has filed an amicus brief urging the U.S. Supreme Court to review the Idaho Supreme Court's decision in Noell Industries, Inc. v. Idaho State Tax Commission, 470 P.3d 1176 (Idaho 2020). In its decision, the Idaho Supreme Court held that Idaho could not tax a holding company on any portion of its gain from the sale of a multistate business that had operated in that state for almost two decades. In its amicus brief, the Commission pointed out that the U.S. Supreme Court has never considered the application of the unitary business principle to a business enterprise that includes a holding company, resulting in a gap in Due Process Clause jurisprudence, and that the Idaho Supreme Court’s decision contributes to a growing conflict among state courts and administrative tribunals. Given the now commonplace use of holding companies, the Commission encouraged the Court to take this opportunity to provide needed guidance on how to apply the unitary business principle when a holding company sells a controlling interest in a multistate business. You can read the brief by clicking here .