On April 4, 2017, QinetiQ U.S. Holdings, Inc. petitioned the US Supreme Court to review the US Court of Appeals for the Fourth Circuit’s decision that the Administrative Procedure Act of 1946 (APA) does not apply to the Internal Revenue Service (IRS) Notices of Deficiency. We previously wrote about the case (QinetiQ U.S. Holdings, Inc. v. Commissioner, No. 15-2192) here, here, here and here. To refresh, the taxpayer had argued in the US Tax Court that the Notice of Deficiency issued by the IRS, which contained a one-sentence reason for the deficiency determination, violated the APA because it was “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.” The APA provides a general rule that a reviewing court that is subject to the APA must hold unlawful and set aside an agency action unwarranted by the facts to the extent the facts are subject to trial de novo by the reviewing court. The Tax Court disagreed, emphasizing that it was well settled that the court is not subject to the APA and holding that the Notice of Deficiency adequately notified the taxpayer that a deficiency had been determined under relevant case law. The taxpayer appealed to the 4th Circuit, which ultimately affirmed the Tax Court’s decision. (more…)