IRS Signals Review of Tax-Deferral Investment Strategies

Investors using 351 exchange ETFs and complex harvest strategies may face new rules regarding future tax-deferral benefits.

Updated on Oct. 29, 2026 in Taxes

Bold flat-color editorial illustration showing balanced geometric spheres and metallic discs, representing complex financial tax structures. — The IRS is reviewing tax-deferral investment strategies, including 351 exchange ETFs, to determine if they align with Congressional tax intent. AI Illustration. Upload story photo >

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Should federal regulators impose stricter limits on complex investment strategies used to defer tax bills?

In late September 2026, the Internal Revenue Service issued formal notices warning that certain tax-deferral investment strategies, including specific exchange-traded funds (ETFs), may not align with Congressional tax intent. This development impacts investors who use these products for capital gains deferral or tax-loss harvesting.

Why it matters

The IRS is scrutinizing novel investment strategies that use offsetting positions to generate gains and losses, signaling a potential shift in how these tax-alpha products are regulated. This scrutiny could impact the future availability or tax treatment of strategies used to manage household tax liabilities.

There are 116 ETFs currently utilizing 351 exchanges with approximately $21 billion in assets. These products are among those being reviewed by the IRS alongside long/short tax loss harvesting strategies, with the full impact on future investor eligibility still under investigation.

The players

Internal Revenue Service

The federal agency responsible for tax administration, regulatory enforcement, and interpretation of Congressional tax law.

The details

Investors use 351 exchange ETFs to move appreciated stocks into a newly formed ETF, a mechanism designed to defer taxable gains. Meanwhile, hedge funds execute long/short tax loss harvesting by utilizing a combination of leverage and straddle option strategies. The IRS is currently monitoring whether these techniques violate long-established Congressional tax intent, with a comment period on the potential regulation of these products having closed on October 28, 2026.

2017 marked the initial rollout of Opportunity Zone Funds.
2019 saw the amendment of ETF rules for stock transfers.
2025 was the year the One Big Beautiful Bill Act passed.
The IRS issued Notice 2026-62 and Rev. Rul. 2026-20 in late September 2026.
The IRS comment period closed on October 28, 2026.

Money Landscape

This regulatory scrutiny follows a period of significant tax-related legislative activity following the passage of the One Big Beautiful Bill Act. The IRS is now revisiting investment strategies that have proliferated under the current rules to ensure they match Congressional intent.

If you hold 351 exchange ETFs or utilize sophisticated long/short tax-loss harvesting strategies, monitor upcoming IRS guidance for potential impacts on your tax-deferral plans. Discuss the potential risks to these investment vehicles with a qualified tax professional to ensure your strategy remains compliant.

The takeaway

The IRS is signaling that tax-deferral products currently popular among some investors may face stricter regulation in the near future. Track potential future IRS guidance and review your current portfolio allocations with a financial advisor to understand how shifts in tax treatment could affect you.