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Today the Tax Court ruled in Hallmark v. Commissioner, 159 T.C. No. 6 (2022) that the time period for filing a petition in a deficiency case is jurisdictional. The Court relies heavily on history and on 7459. We will write more as we digest the full opinion but once again the Court does not find Supreme Court case law regarding jurisdiction, including the recent decision in Boechler, to deter it from the conclusion that the time period for filing a petition is jurisdictional. The decision will no doubt set off litigation in the circuit courts around the country and may lead again to a decision by the Supreme Court which last time reversed the 17-0 decision of the Tax Court in Guralnik v. Commissioner with a 9-0 decision in Boechler.