The Third Circuit Court of Appeals reversed the Tax Court on the validity of Treas. Reg. 1.6015-5(b)(1) which establishes a two year statute of limitations for innocent spouse relief under IRC Sec. 6015(f). The Court of Appeals remanded to the Tax Court for a finding on the petitioner’s argument for an equitable tolling of the statute.
For more on this question, see the Lantz opinion out of the Seventh Circuit.