Does a 351 ETF exchange really let you avoid capital gains?

Here’s some context if you ever get a marketing email saying: contribute your appreciated stock portfolio to a new ETF under Section 351 and there’s no tax on the way in; the ETF later hands those same stocks out through in-kind redemptions and there’s no tax on the way out. Two tax-free steps, so the gain must be gone. It isn’t. The second exemption belongs to the fund, not to you, and your gain remains embedded in your ETF shares, generally recognized if you sell them.

Here is how it works. When you contribute securities to a newly launched ETF in a qualifying 351 exchange, you don’t recognize gain, but your basis carries over into the ETF shares (Section 358). The fund takes your old basis in the securities as well (Section 362); those are two separate layers. Later, when an authorized participant redeems a block of ETF shares, the fund pays in securities rather than cash, and Section 852(b)(6) lets a regulated investment company do that without recognizing gain on the appreciated securities it hands out. That’s the exemption people latch onto. It solves the fund’s problem (no capital-gain distributions attributable to those in-kind redemptions get pushed onto remaining shareholders when low-basis holdings leave the portfolio), and it never touches your basis.

Consider a $5 million portfolio with a $1 million basis. Contribute it in a qualifying 351 exchange: no gain recognized on the $4 million. You now hold $5 million of ETF shares with a $1 million basis. The fund later moves every stock you contributed out through qualifying in-kind redemptions and replaces them: no gain at the fund level on those distributions. You sell your ETF shares for $5 million: $4 million of gain, the same $4 million you walked in with.

So why do it? Because the portfolio inside the fund can change while the deferred tax dollars stay invested. An appreciated portfolio that meets the diversification requirements, or a mature direct-indexing account with no losses left to harvest, is hard to rebalance without realizing gains. Inside the ETF wrapper, positions that leave through in-kind redemptions do so without fund-level gain, though the fund can still recognize gain on anything it sells for cash and distribute it to shareholders. The deferral is real; it is not a blanket exemption on everything the fund does.

One separate rule to know about: if you hold the ETF shares until death, Section 1014 generally resets their basis to fair market value, which can eliminate the pre-death appreciation for income tax purposes. That is an estate planning outcome, not something the 351 exchange itself does. The exchange defers the gain; it does not erase it.

Two qualification caveats. The contributing investors, as a group, generally must own at least 80% of the ETF immediately after the exchange, which is why these transactions are coordinated around a fund launch rather than done into an existing ETF. And each contributor’s portfolio generally has to be diversified on its own (no more than 25% in one issuer, no more than 50% in five or fewer issuers), so a single large position can’t ride in on other people’s diversification.

Finally, at a July 21, 2026 Wall Street Tax Association meeting, IRS and Treasury officials named this exact pairing, a 351 contribution followed by 852(b)(6) redemption of the contributed assets, as a transaction they are examining. According to K&L Gates’ account of the meeting, officials declined to bless any particular transaction but acknowledged that contributions fitting the ETF’s investment profile, with dispositions in the ordinary course of business, can be viable. That is scrutiny, not a ruling.