Treasury and IRS invalidate abusive ETF tax deferral strategies in new rulings

Key points

• Revenue Ruling 2026-20 recharacterizes specific Section 351 ETF conversions as taxable exchanges under Section 1001, denying nonrecognition treatment.
• Notice 2026-62 warns against related abusive strategies, including partnership exchange funds and 'box spread' option structures.
• The IRS applies substance-over-form and step-transaction doctrines to reject transactions where the ETF acts merely as a conduit for asset swaps.
• Treasury Secretary Scott Bessent stated that these conversions 'don't work under existing law' and are designed to dodge taxes.
• The comment period for the notice closes on October 28, 2026, with further guidance expected on the definition of 'shortly thereafter' redemptions.

Background

This action follows earlier warnings in July 2026, when Treasury officials met with the Wall Street Tax Association to discuss questionable Section 351 exchanges. A Bloomberg analysis from July indicated that $22 billion in ETFs had been created for this purpose, deferring up to $6.5 billion in capital gains, with activity accelerating since 2024. The new rulings represent the first concrete regulatory enforcement step after these preliminary discussions.

How outlets are covering it

CNBC emphasizes the impact on wealthy investors and the high cost of these strategies, noting that creating such ETFs can cost $200,000 to $300,000 and is typically viable only for those with over $100 million in appreciated stocks. The Daily Upside highlights the clarity provided to the industry, with co-founder Shang Chou noting that 'well-behaved' 351s aligned with an ETF's core strategy remain permissible, while pre-planned tax-avoidance schemes are now prohibited. Current Federal Tax Developments provides a detailed legal analysis, explaining how the IRS uses judicial doctrines like substance-over-form to recharacterize these transactions as direct taxable exchanges, citing precedents such as Kuper v. Commissioner. Some experts, like Mel Faber of Cambria Funds, argue that the specific language in the notice might inadvertently encourage more mainstream use of well-designed 351 exchanges, while others see it as a necessary crackdown on abusive financial engineering.

Why it matters

The rulings close a significant loophole that allowed high-net-worth individuals to diversify concentrated stock portfolios without triggering capital gains taxes. By invalidating these 'conduit' transactions, the government aims to ensure that tax rules reward genuine investment rather than abusive financial engineering. This move may force wealthy investors to consider alternative tax-deferral strategies, such as exchange funds or charitable remainder trusts, which have different holding period requirements and structural constraints.

What to watch

The IRS and Treasury will review public comments submitted by October 28, 2026. Tax practitioners expect further guidance to clarify the ambiguous timeframe of 'shortly thereafter' for redemptions. Congress may also consider legislative changes to narrow how ETFs benefit from distributing appreciated securities. Investors are advised to consult tax professionals to ensure their strategies comply with the new substance-over-form standards and avoid audit exposure.