Hey there, bargain hunter. If you have been eyeing certain ETF conversion strategies that promise to let you swap a pile of appreciated stock into a diversified fund without writing a check to the IRS, Treasury and the IRS just walked into the room and turned off the music.
Scoreboard
The U.S. Treasury and IRS issued new guidance on September 28, 2026 targeting investors as well as financial, tax and investment advisors who have been using an ETF strategy to avoid recognizing capital gains taxes.
What Actually Happened
Section 351 of the tax code generally lets investors transfer property to a corporation in exchange for its stock without recognizing a capital gain, subject to limitations. A transfer of a portfolio of securities to a newly formed ETF has been used as part of transactions designed to avoid recognizing built-in gains.
In the scenario highlighted by the ruling, an investor contributed a portfolio to a brand new ETF, which then distributed some or all of those same securities soon after in redemption of shares held by an authorized participant, leaving the investor with a materially different mix while attempting to avoid recognition of built-in gains on the original holdings. Revenue Ruling 2026-20 holds that, for federal income tax purposes, the ETF is merely a conduit in such a plan and treats the investor as making a taxable exchange under Section 1001 with the authorized participant for the contributed securities used in the redemption.
A Bloomberg analysis found that 105 ETFs created through these Section 351 seeding structures launched with about $22.1 billion in assets and deferred at least $6.5 billion in embedded capital gains, with activity accelerating since 2024.
What the Market Is Really Saying
This is not a niche accounting footnote. A Bloomberg report said more than $90 billion flowed into products marketed as “tax alpha” strategies between the start of 2025 and April 2026. The advisor channel that built product and revenue around these conversions is now staring at a compliance cliff.
Other strategies flagged beyond the core 351 conversion include partnership exchange funds, box spread funds, record date strategies, regulated investment company income test avoidance, and certain tax-aware fund strategies. The crackdown is wider than one ruling.
The death-by-a-thousand-heirs angle is what made regulators move. If you defer gains through a 351 exchange and hold those ETF shares until death, heirs can receive a stepped-up cost basis, which can eliminate the embedded gain for federal income tax purposes.
What Is Still Allowed
The notice expresses no view on Section 351 transactions that seed a new ETF with assets consistent with its investment thesis that are intended and expected to be retained absent a substantial change in circumstances. In plain terms: contribute appreciated stock to a fund that actually plans to hold it, and you are likely fine.
Advisors and investors who use Section 351 to seed a new ETF with assets consistent with the ETF’s investment thesis, and that the ETF intends and expects to retain absent a substantial change in circumstances, may not be in the crosshairs of this particular ruling. The target is the in-and-out maneuver, not the legitimate long-term seeding transaction.
One thing regulators are not going to do is kill the idea of exchanging securities for shares, because the core ETF ecosystem relies on in-kind creations and redemptions that are generally not taxable to the ETF under the rules that govern regulated investment companies.
Action Plan
- Pending 351 conversion in progress: Stop before it closes and get a tax attorney to review it against the three red flags highlighted in the new guidance: evidence of a plan that includes a quick redemption after seeding, a distribution of some or all of the contributed securities in that redemption, and an end state where the investor has a materially different portfolio exposure.
- Long-term holders using legitimate seeding transactions: No immediate action needed, but document the business rationale thoroughly and stay patient until Treasury and the IRS decide whether to take additional action after the October 28, 2026 comment deadline.
- Advisors marketing tax-alpha ETF strategies: Recheck your compliance posture now. The government is explicitly signaling that it is looking past form to substance in these transactions.
- Ordinary ETF investors in BlackRock, Cambria, or other major ETF sponsors: No direct impact on standard fund operations. The ETF industry is a multi-trillion-dollar market, and regulators are not aiming to undermine the ordinary in-kind mechanics that make plain-vanilla ETFs run.
Cheap Investor Checklist
- Watch for Revenue Ruling 2026-20 to be cited in any ETF prospectus amendments filed in the next 60 days.
- Track the October 28 comment deadline: pushback from the Investment Company Institute or Wall Street Tax Association could influence what comes next.
- Monitor whether Cambria, Alpha Architect, or other boutique ETF sponsors that built businesses around 351 seeds disclose material impacts in their next filings.
- Check whether any pending 351-seeded ETF launches are quietly pulled or delayed.
- Watch for legislative follow-through: Senator Ron Wyden has described related ETF tax mechanics as a loophole, and proposals to change capital gains treatment at death have repeatedly surfaced in Congress over the years.
Bottom Line
If the conversion was structured to move in quickly, swap out the holdings, and leave the IRS holding an empty bag, the IRS is now calling it a taxable exchange. If it was a genuine, long-term seeding of a new ETF with assets consistent with the ETF’s investment thesis that the ETF intends and expects to retain, you likely remain in the clear. The difference between those two sentences is where every advisor conversation needs to happen before October 28, 2026.
