Section 351 Exchanges: The Portfolio Cleanup Tool Hiding in the Tax Code

“The only useful financial innovation in the last 20 years is the ATM.”  

That was former Federal Reserve Chairman Paul Volcker’s assessment in the aftermath of the 2008 Global Financial Crisis, when acronym’d products like CDSs and CDOs helped turn “financial innovation” into a phrase that deserved side-eye. 

Wall Street has a long history of dressing up complexity as sophistication. Too often complex “solutions” wind up boosting the industry’s compensation instead of solving investors’ problems. 

So, when I say that a tax-code provision may be one of the most useful investment innovations available to investors, please understand: I don’t say that lightly. 

And yes, I realize “tax-code provision” is a phrase that makes most people immediately start thinking about literally anything else but stick with me.

The Section 351 exchange may help solve one of the most common problems successful investors face: being trapped in a portfolio they no longer want because selling would create a tax bill they definitely do not want.

The problem: taxes have created a hurdle to making changes to your portfolio

Maybe you’ve accumulated too much of your employer’s stock through the years.

Maybe you’ve collected an unwieldy portfolio with dozens of individual stocks and hundreds of tax lots that require more maintenance than a fantasy baseball team. 

Maybe you bought Nvidia before it went up 1,000%+, and now your “good problem to have” has become a concentration problem.  

Maybe you have legacy ETFs or individual stocks that were perfectly fine when you bought them, but today you’d rather own something cheaper, simpler, more diversified, or better aligned with your financial plan. 

The obvious answer is to sell what you don’t want and buy what you do want. The problem is taxes. An increased tax bill can be a nonstarter, so many investors do nothing—not because that’s the optimal choice, but because inertia is the easiest and cheapest path. 

That’s the trap. 

Inertia creates portfolios full of old decisions. Those decisions, left unattended, can allow the portfolio to slowly drift away from the investor’s actual goals.

The solution: a §351 exchange

Section 351 of the Internal Revenue Code allows investors to contribute property to a corporation in exchange for stock in that corporation without recognizing gain or loss at the time of the exchange, assuming the rules are followed. 

Historically, this was mostly a tool for corporate restructuring: Widget Inc. wants to merge with Gizmo Co. to create Doohickey Corp. Widget’s owner contributes his shares, Gizmo’s owner contributes hers, and they both get shares of Doohickey in return, making the swap without immediately recognizing gain. Nifty, but not applicable to most investors. 

The newer and more interesting use case is applying §351 to ETFs. 

An investor can contribute eligible securities into a newly formed ETF. In return, the investor receives shares of that ETF. If the exchange qualifies, the investor does not incur capital gains tax at the time of contribution. 

The key phrase there is “at the time.” This is tax deferral, not tax elimination. Your original cost basis carries into the ETF shares you receive. If you later sell the ETF, you may owe capital gains tax then.  

Still, tax deferral can be extremely valuable. It may allow you to move from a messy, concentrated, or outdated portfolio into a more intentional ETF strategy, without lighting a pile of money on fire to pay the tax bill.

The rules

This is not a “click here to avoid taxes” button. Those usually come with a subpoena. To qualify for §351 tax deferral, several important requirements must be satisfied. 

1. The control requirement: Immediately after the Section 351 exchange, the contributing investors must collectively control at least 80% of the new ETF. This requirement would not be met if you tried contributing your old portfolio into a large existing ETF, which is why these exchanges generally happen when a new ETF is launched (more on this in a moment).

2. The diversification requirement: Because the IRS does not want investors using §351 to turn one giant appreciated stock position into a diversified portfolio without tax, the contributed assets need to pass diversification tests. There are two diversification tests:

• No single holding can be more than 25% of the contributed portfolio.
• The top five holdings combined cannot be more than 50%.

For investors contributing individual stocks, that means a highly concentrated single-stock position is not going to qualify on its own. If 70% of your taxable account is one stock, §351 is not a magic portal to tax-free diversification. 

Importantly, ETFs are evaluated on a look-through basis for these tests. So, if you contribute an ETF that owns hundreds of stocks, the test will look through to the underlying holdings rather than treating the ETF as one giant position. That can make diversified ETF holdings easier to contribute than a concentrated individual stock portfolio. 

There are also practical limitations around what can be contributed. Individual stocks and certain ETFs may work. Mutual funds generally do not. Restricted stock, private investments, options, crypto, and other complicated holdings may be ineligible. 

3. The timing requirement: Investors can only participate at the launch of a brand-new ETF. An increasing number of ETFs are launching via §351-seeding, so you might not have to wait terribly long before the right opportunity comes along, but this is still not something that can be done on demand.

4. The portfolio management requirement: the ETF generally cannot be launched with a pre-arranged plan to immediately dump the contributed securities, except in the ordinary course of business. This is one reason many 351-seeded ETFs have broad mandates. The manager needs room to manage the portfolio, but the transaction cannot simply be “contribute appreciated securities on Monday, sell them on Tuesday, avoid taxes forever.” Nice try, but the tax code has seen a few things.

5. No loopholes: Investors must avoid “sequential seeding” or “staged exit” plans as a way to get around diversification requirements. For example, you might contribute some Nvidia and ETF A in exchange for ETF B. You should not plan on then contributing more Nvidia and ETF B in exchange for ETF C (and so on and so forth) to gradually whittle down a concentrated position in Nvidia.

The most important piece: investment strategy

Investors get a twinkle in their eyes when presented with an opportunity to save on taxes. If that twinkle distracts them from the fundamentals of a sound investment strategy, disaster can happen.  

The ETF’s strategy matters. Its costs matter. Its expected risk and return matter. Its holdings, turnover, liquidity, trading spreads, distribution policy, and manager all matter. How it fits in the context of your full portfolio matters. 

The tax benefit is nice, but the investment case should always come first. 

The tail doesn’t wag the dog, and investors should not allow taxes to dictate their investment decisions.

What could go wrong?

Plenty. 

The Section 351 exchange could fail to qualify, creating an unexpected taxable event.

The contributed portfolio could fail the diversification tests. 

The ETF strategy could disappoint. 

The manager could handle the portfolio differently than you hoped. 

The regulatory environment could evolve. Any tax strategy that becomes popular enough eventually attracts attention, and §351 ETF exchanges are no exception. 

None of that means the strategy is bad. It means the strategy is real. Real strategies have tradeoffs while fake strategies have only benefits, which is a useful guide to differentiate them.

The bottom line

For decades, investors with highly appreciated assets have faced an uncomfortable choice: keep a portfolio they no longer want, or sell it, improve the portfolio, and pay a painful tax bill immediately. The Section 351 Exchange may create a third option. And in an industry that routinely markets complexity as innovation, genuine usefulness deserves attention.

The best investment tools do not promise magic; they help investors make better decisions, reduce friction, and align their portfolios with their goals. For the right investor, with the right assets, moving into the right ETF, executed the right way, this may be one of the rare financial innovations worthy of Volcker’s approval.

This piece has been contributed by Conor Feldmann, Sr. Portfolio Manager & Shareholder. To read more on current events and market analysis from Conor subscribe to his blog, Demystifying Markets, here.