“Earlier this year, my advisor walked me through a Section 351 ETF conversion as a way to diversify without triggering the full capital gain. And we went through with it. Then on Monday I saw the IRS came out with a new ruling saying these don’t work. Am I about to get a big tax bill? And when would it hit?”
That is a real question from a listener who has $4.2 million sitting in a single stock from a 2015 acquisition, most of it in a taxable account. The ruling he is referring to is Revenue Ruling 2026-20, and I will be straight with you: I do not have a clean answer on the timing, and anyone who gives you one this week is guessing.
Why These Conversions Existed in the First Place
The concentrated stock problem is simple. You own $4.2 million of one company, you know you should not, and selling it triggers a long-term gain you would rather not pay. A Section 351 exchange lets you contribute that stock into a fund alongside other investors who contribute theirs, and everyone walks away holding a slice of the pool. You went from owning $4.2 million of one stock to $4.2 million of several.
The IRS has never loved this, and the rules reflect that. You cannot simply mix financial securities together and call it a day. The structures that worked required a meaningful slice of non-financial assets, such as real estate or business partnerships, often in the range of 20% to 30% of the portfolio. Those assets were the whole point of the design.
Correlated Is Not the Same as Safe
One thing I hear constantly is “it tracks the S&P 500, so who cares what is inside?” I care what is inside. It is much easier to build something that moves like an index than something that actually owns the index. Correlation is not risk.
Here is where that bites. When you eventually leave the fund, you are holding whatever it holds, which can be a collection of random positions with fees attached and nobody managing them to match anything. You were promised diversification and you may have received exposure to assets with a very different risk structure from the stock you started with.
No Free Lunch, and the IRS Noticed
My rule on tax strategies is that if the pitch is “you never have to pay the tax if you just do this,” I want to look very hard at it. A 1031 exchange is a legitimate deferral tool, and the word that matters there is deferral. Real exchanges move the bill; they do not erase it.
The IRS describes what happened here as abuse, and the same ruling touches box spread trades and partnership workarounds that were circulating alongside these deals. When a regulator makes an example of a strategy, you do not want to be the example. I have never been a fan of creative readings of the tax code that drift away from what the law was written to do, because no one enjoys paying taxes, and almost no one enjoys paying them with interest.
What the Bill Could Look Like
If your conversion gets recharacterized, you could owe the full long-term gain on the original stock, plus state taxes, plus interest on back taxes. There is still uncertainty about exactly which structures the ruling reaches and which it leaves alone. Several things will turn on facts specific to you: redemption timing, your basis, what you actually contributed and received, and how the whole structure is read.
It also may not be quick. Depending on how aggressive the original structure was, this could be a year or two of unwinding. I would plan for a long process rather than a single bill on a single date.
Ask Your CPA This Before Anything Else
Your first call, besides us, is to your CPA, and it should be a direct one. Ask whether they are aware of Revenue Ruling 2026-20 and whether they have handled a Section 351 unwind before. Expect it to cost real money and time, and expect to bring in a tax attorney who specializes in this area.
If the honest answer is no, that is not a knock on your CPA. It means you need someone who has walked this path, and you need to find that person now rather than after the first IRS letter arrives.
This post is adapted from a recent episode of the Scholar Wealth Podcast. For more perspective on how the IRS ruling affects ETF conversions, watch the full podcast episode here.