The pitch deck practically wrote itself: hand your appreciated stock to a newly launched ETF, take back a diversified basket, and the capital-gains bill — the one reason you never sold — simply never arrives. They’re called 351 conversions, after the tax-code section doing the heavy lifting, and since ETFs began running them in 2021, more than 100 funds have launched this way and raised $20 billion or more, by an independent tax analyst’s count. On Monday the Treasury Department answered with its first formal warning against tax-motivated investment strategies, the Journal’s Richard Rubin and Miriam Gottfried report — moving to limit the conversions and labeling a family of related maneuvers potentially abusive.
Some of those ETF swaps now count as taxable events under the new guidance. Treasury Secretary Scott Bessent didn’t leave room for a softer reading, posting that on these conversions, “they don’t work under existing law.” Officials added that the transactions aren’t the conventional, long-established planning Congress intended — the polite way of saying the discount was never real.
The rest of the flag list
Treasury didn’t stop at 351s. It flagged — no new rules yet, but public comment open and regulations threatened — a partnership variation of the same conversion, ETF trades built on box spreads that manufacture deductible losses, fund-timing maneuvers around dividend dates designed to avoid recognizing dividend income, and a set of swap and foreign-currency strategies. The common ancestor of all of them is the past few years’ rally: big embedded gains, and a cottage industry selling ways to defer them or conjure offsetting losses, including a leveraged form of tax-loss harvesting. A tax-law academic at NYU called the crackdown a welcome first step, arguing that holes left open attract ever more aggressive avoidance.
None of this outlaws tax planning — it isn’t meant to. It draws a line through one particular genre: the kind where the return comes not from the market but from the position that the gain, somehow, was never income.
Our read
Tax and Estate: if a strategy’s core pitch is that the gain disappears, assume the IRS has read the same slide — and as of Monday, formally, it has. The boring ladder still works and didn’t get flagged: annual gifting, charitable gifts of appreciated shares, the basis step-up at death, and plain old timing — realizing gains in low-income years. Households sitting on concentrated, appreciated stock should review positions before year-end against the rules as they now stand, not as a product brochure described them in March. Unwinding a flagged strategy early is almost always cheaper than defending it later.
If any fund on your statements arrived by way of a conversion like this, it’s worth a look before December — better to check the forecast now than to discover the storm on April 15.