IRS rules certain 351 ETF conversions taxable, says more guidance could follow

The Internal Revenue Service has ruled that the 351 conversion — an ETF maneuver gaining traction among financial advisors looking for sophisticated ways to diversify clients' low-basis holdings — is taxable in certain instances. The conclusion arrived in Rev. Rul. 2026-20, handed down alongside Notice 2026-62, released Monday, in which the IRS and the Treasury Department identified several investment fund strategies they said may produce tax results inconsistent with federal tax rules and signaled that more guidance on ETF tax strategies could follow.

The arrangement the ruling reaches takes three moves. An investor seeds a new ETF with appreciated securities that do not fit the fund's investment thesis. The ETF then issues shares to an authorized participant in exchange for securities that do fit the thesis, or for cash earmarked to buy them. Shortly afterward it redeems those shares in kind and hands the investor's original holdings back. The investor finishes owning a materially different portfolio and having paid no tax on the embedded gain. The appeal is easy to see from both sides of the table: the client gets diversification without a sale, and the fund gets assets to launch with.

Rev. Rul. 2026-20 treats the ETF as a conduit in that arrangement and recharacterizes the deal as a taxable exchange between the contributing investor and the authorized participant. Those are the two parties the ruling names, and the coverage does not say how a liability would be divided between them — the first question a client who has run one of these conversions will ask, and one the guidance does not answer. The notice flags a partnership variation as well, aimed at investors whose holdings are too concentrated to clear the diversification test on their own.

Section 351 of the tax code generally lets an investor transfer property to a corporation in exchange for its stock without recognizing a capital gain, provided the transaction satisfies certain control and diversification tests. A portfolio usually counts as diversified when no single issuer makes up more than 25% of its value and the five largest issuers no more than half. That arithmetic describes the client the strategy was built for: a holder whose position is too big to sell without a punishing tax bill and too concentrated to pass the test unaided.

The IRS said the problem arises when the contribution is part of a larger plan. That makes the plan, rather than the contribution, the thing to reconstruct, and the ruling describes it generically — a pattern, not a named firm or fund. Read against the notice's silence on seeds the fund keeps, the two documents appear to separate a contribution that stays put from one assembled to be swapped back out, though neither says so in those words.

The agencies left conventional practice where they found it. The notice expresses no view on 351 transactions that seed a new ETF with assets that match its strategy and that the fund expects to keep, and it does not address routine ETF creations and redemptions — the in-kind machinery behind much of the wrapper's tax efficiency, and a structural advantage lawmakers have previously sought to eliminate through legislation. The notice does cover several other strategies beyond 351, according to the report.

So the line runs through the fund's intention. A seed contribution whose assets match the strategy and that the fund means to hold sits outside the notice's view; the same contribution arranged as the opening step of a larger plan is what the revenue ruling taxes. What separates the two on the page is not the contribution itself but where the securities end up: still in the portfolio a few quarters later, or handed back in kind.

For a fund sponsor, that makes the seed deal a documentary exercise as much as an investment one. A contribution the fund means to keep is a different proposition from one built to be unwound, and the intent that distinguishes them sits with the sponsor — a fact about the fund rather than about the client's gain. The guidance lands while advisors are moving deeper into fund structures; InvestmentNews paired its report with related coverage of why RIA firms are launching their own ETFs, and a new fund's first problem is the seed contribution.

What the ruling settles is the exchanges already done. The notice leaves open what comes next, with the report saying the agencies signaled the possibility of more guidance on ETF tax strategies. Neither document puts a figure on how much client money has moved through 351 exchanges, and both describe a pattern rather than naming names. For an advisor, the narrow question is whether the client's ETF took securities it intended to hold or securities it intended to trade away — and the fund's portfolio answers that before any further guidance arrives.