The approval of perpetual futures contracts in the US could lead to unforeseen tax and regulatory uncertainty for traders if these products are ultimately classified as swaps rather than futures, a concern voiced by CME Group Chairman and CEO Terry Duffy. In an interview, Duffy pointed out the ambiguity surrounding the tax implications for US participants. This issue has arisen as CME continues its legal challenge against the Commodity Futures Trading Commission (CFTC) regarding the regulator's approval of perpetual futures contracts in the US. The outcome of this case could substantially influence the US approach to perpetual futures, including how the Internal Revenue Service (IRS) taxes these contracts.

The dispute centers on whether perpetual futures should be legally categorized as futures or swaps, with Duffy arguing they should be considered swaps due to the periodic funding payments between long and short positions, which aligns with the statutory definition of a swap under US law. If perpetual contracts are deemed swaps, they would be taxed under 'ordinary' taxation, unlike the blended tax treatment available for futures under Section 1256 of the US tax code. Given the novelty of perpetual futures, the IRS has not provided specific guidance on their tax treatment, potentially leading to uncertainty for market participants if the classification changes. Legal experts emphasize the complexity of the issue, noting that while perpetual futures structurally resemble swaps, they function economically like futures, making it a 'substance-over-form' question.

The broad definition of swaps and the recent Supreme Court decision eliminating the Chevron doctrine, which reduces deference to agency interpretations of ambiguous statutes, add to the uncertainty. This could lead to prolonged litigation, with courts playing a more significant role in interpreting derivatives laws for novel financial products like perpetual futures. Ultimately, the tax treatment may require separate IRS guidance, which is not bound by the CFTC's interpretations, potentially leaving large institutions uncertain about how to report trades involving perpetual futures until regulatory or judicial clarity is achieved.