Time to Appeal: Challenging PTAB Time-Bar Determinations at the Federal Circuit

Following the 10th Circuit's April 21, 2026, decision affirming the disallowance of Liberty Global’s $2.4 billion deduction under the codified economic substance doctrine, I.R.C. § 7701(o), Liberty Global filed a petition for panel rehearing or rehearing en banc on June 5, 2026. That petition has since drawn significant amicus support from various industry groups representing large taxpayers, as discussed below....