Reuven Avi-Yonah (Michigan), “Liberty Global and the Revival of Economic Substance” (Tax Notes, May 25, 2026):

On April 21 the Tenth Circuit issued its long-awaited opinion in Liberty Global. By a 2-1 majority, the panel upheld the decision of the district court that a tax shelter used by Liberty Global had to be disregarded under the economic substance doctrine (ESD).

This decision is the third victory of the government in ESD cases, following Patel and Otay. But it is the most significant because it strikes a decisive blow against tax shelters built on a literal application of the statutory text but ignore Congress’s purpose in enacting that text. Patel established that the ESD can be relevant to tax shelter cases even if the shelters follow the text of the statute, and Otay held that a transaction that had a valid overall business purpose can still fail the ESD if that purpose did not require an elaborate tax-motivated structure. Liberty Global goes beyond these cases by holding that a tax shelter that complies with the text of the code can be disregarded because it deviates from Congress’s purpose in enacting that text. This is a welcome departure from the narrow textualism followed by the Tax Court in Varian.

To understand the significance of these cases, it is helpful to review the history of the ESD. It stems from Frank Lyon, a Supreme Court case decided in 1978. Before Frank Lyon, the leading cases on disregarding tax-motivated transactions, Gregory and Knetsch, focused on whether the transaction was consistent with Congress’s purpose in enacting the statutory provision.