For investors with highly appreciated securities, diversification can be difficult. Selling appreciated positions may create immediate capital gains tax, while holding them may leave the investor too exposed to one company, sector, or strategy. A Section 351 Exchange-Traded Fund (ETF) conversion may offer another path: contributing securities into a newly formed ETF in exchange for ETF shares, generally without triggering immediate gain if the transaction is properly structured.
What Is a §351 ETF Conversion?
Section 351 of the Internal Revenue Code generally provides that no gain or loss is recognized when property is transferred to a corporation solely in exchange for stock, as long as the contributing transferors are in control of the corporation immediately after the exchange.
In the ETF context, the “corporation” is typically a newly created regulated investment company structured as an exchange-traded fund (ETF). Investors contribute securities to help seed the new ETF. In return, they receive ETF shares.
In plain English, the investor is not selling the appreciated securities for cash. They are changing the form of ownership from a direct securities portfolio into shares of a newly launched ETF.
Why This Strategy Is Gaining Attention
- 351 ETF conversions have become more visible because they may help certain investors address two problems at once:
- They may defer capital gains tax that would otherwise arise from selling appreciated securities.
- They may create a cleaner, professionally managed ETF position that is easier to hold, trade, and report.
A §351 conversion is not simply a shortcut for moving any low-basis stock into any ETF. The structure must fit the tax rules, the ETF’s investment mandate, and the investor’s broader financial plan.
How the Process Typically Works
A §351 ETF conversion generally involves several steps:
- The investor and advisor review the existing portfolio.
- The ETF sponsor confirms whether the securities align with the new ETF’s investment strategy.
- The investor contributes eligible securities in-kind.
- The newly formed ETF issues shares back to the investor.
- The investor’s basis and holding period generally carry over into the ETF shares.
In short, investors contribute securities to a newly formed ETF in exchange for ETF shares, with key requirements involving investment company rules, diversification, 80% control, and having a plan for the transaction.
The Diversification Requirement Is Critical
One of the most important limitations is that the contributed portfolio must generally be diversified. This is where the strategy can be misunderstood.
A §351 ETF conversion may not work for an investor who owns only one highly appreciated stock. The rules are designed to prevent a taxpayer from using an investment company to convert a concentrated position into diversification without tax. In practice, the contributed portfolio generally must satisfy diversification thresholds, including limits on how much can be represented by one issuer and by the top five issuers.
For investors with a long-held separately managed account, an “ossified” portfolio, or many appreciated public securities, the strategy may be more realistic. For an investor with one concentrated stock, other strategies may need to be evaluated first.
What Are the Potential Benefits?
When properly structured, a §351 ETF conversion may provide:
- Tax deferral instead of immediate capital gains recognition.
- A more diversified or rules-based investment vehicle.
- Professional management inside an ETF structure.
- Simpler reporting (1099s) compared with some partnership-based strategies.
- More liquidity than certain private exchange fund strategies.
- Heirs may receive a full step up in basis after your passing
It can also help investors move from a legacy portfolio toward a more intentional investment allocation without first creating a large taxable event.
What Are the Trade-Offs?
A §351 ETF conversion is generally tax-deferred, not tax-free. The built-in gain does not disappear. The investor typically carries over basis into the ETF shares, meaning tax may be recognized later if the ETF shares are sold.
Other considerations include:
- Not every portfolio qualifies.
- The ETF sponsor may reject securities that do not fit the fund’s strategy.
- The investor may receive an ETF that is less customized than a personal portfolio.
- The structure may involve legal, tax, and operational costs.
- Future IRS scrutiny could increase if the transaction appears more like tax-free diversification than legitimate ETF formation.
- Avoid making gifts during your lifetime, as the recipient generally inherits your original cost basis rather than receiving a stepped-up basis.
The Advisor’s Role
This strategy works best when coordinated with a wealth advisor and tax advisor together. The wealth advisor can evaluate whether the ETF fits the investor’s risk tolerance, liquidity needs, and long-term goals. The tax advisor can evaluate whether the proposed contribution is defensible, properly documented, and consistent with Section 351 requirements.
The key question is not, “Can we avoid tax today?” It is, “Does tax deferral support a better overall plan?”
Final Takeaway
A §351 ETF conversion can be a powerful strategy for investors seeding new ETF funds with appreciated securities. But it is highly fact-specific. For the right portfolio, it may offer a practical way to modernize holdings and defer tax. For the wrong portfolio, especially a single concentrated stock position, it may not be available or advisable.
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Aura Advisors is a boutique tax consulting and compliance firm working with start-ups, emerging growth companies, and affluent individuals. Making it safer for good people and good companies to continue to do good things.