Over the past decade, many investors have benefited from significant growth in the stock market. While that growth is welcome, it has created a less obvious challenge—many portfolios now contain substantial unrealized gains.
These gains can make it difficult to adjust an investment strategy without triggering capital gains taxes. As a result, some portfolios become what is often described as “locked up”—where making changes may come with meaningful tax consequences.
A relatively new strategy, known as a Section 351 exchange, is gaining attention as a potential way to address this issue in a more tax-efficient manner.
The Challenge: When Gains Limit Flexibility
In a taxable investment account, selling appreciated assets generally results in capital gains taxes. Over time, this can create a dilemma.
Investors may want to:
- Rebalance their portfolio
- Reduce concentration in certain holdings
- Shift to a more diversified or tax-efficient strategy
But doing so may require selling appreciated positions and realizing taxes—sometimes at a significant cost.
Because of this, investors often delay making needed adjustments or accept a portfolio that no longer aligns with their goals.
A New Approach: What Is a Section 351 Exchange?
A Section 351 exchange refers to a provision in the tax code that, under certain conditions, allows investors to contribute assets into a new investment structure—typically an exchange-traded fund (ETF)—without immediately recognizing capital gains.
In simplified terms, the process works like this:
- Multiple investors contribute appreciated securities into a newly formed ETF
- In exchange, each investor receives shares of that ETF
- If the transaction meets specific requirements, no capital gains are triggered at the time of the exchange
Once inside the ETF, the portfolio can be managed more flexibly. ETFs are generally structured to allow for tax-efficient trading within the fund, meaning that changes to the underlying investments may not create immediate tax consequences for shareholders.
Why This Matters
For investors with highly appreciated portfolios, this approach offers a potential way to move from a “locked” position into a more adaptable investment structure—without the upfront tax cost that would typically accompany a sale.
This can be particularly relevant for:
- Investors with long-held equity positions
- Individuals seeking greater diversification
- Clients transitioning to a new investment strategy
- Business owners or retirees with concentrated holdings
However, it is important to understand that this is not a universal solution.
Key Limitations and Considerations
Section 351 exchanges come with specific requirements and practical limitations.
One important requirement is diversification. To qualify for tax-deferred treatment, contributed portfolios must meet certain thresholds—generally meaning that no single holding can dominate the portfolio. This makes the strategy less suitable for investors whose wealth is heavily concentrated in one or two securities.
In addition, the structure itself can be complex. These exchanges are typically facilitated either by:
- ETF sponsors, who manage the process and ongoing investment strategy, or
- Advisors launching custom ETFs, which offers more flexibility but involves additional legal, tax, and operational complexity
Because this is a relatively new and evolving strategy, availability is still limited, and not all investors will find it appropriate.
A Practical Example
Consider an investor who has held a diversified portfolio of equities for many years. The portfolio has grown significantly, but rebalancing into a more conservative allocation would require selling positions and triggering substantial capital gains.
Through a properly structured Section 351 exchange, the investor may be able to contribute those holdings into an ETF and receive shares in return—allowing the underlying portfolio to be repositioned over time within a more tax-efficient framework.
By contrast, an investor whose portfolio consists largely of a single highly appreciated stock may not meet the diversification requirements, making this approach less viable.
What This Means for You
If your portfolio includes significant unrealized gains, you may be facing a tradeoff between maintaining your current allocation and incurring taxes to make changes.
Emerging strategies like Section 351 exchanges highlight that there may be additional options available—particularly for investors seeking to improve diversification or adopt a more tax-efficient approach without immediate tax consequences.
At the same time, these strategies require careful evaluation. Factors such as portfolio composition, long-term goals, tax considerations, and overall financial planning all play a role in determining whether such an approach is appropriate.
At Alperin Law & Wealth, we take a coordinated approach that integrates tax, legal, and financial planning. As new strategies like Section 351 exchanges continue to develop, we monitor their applicability and help clients evaluate how they may fit within a broader planning framework.
A Thoughtful Approach to Tax Efficiency
Managing taxes is an important part of preserving and growing wealth, particularly for investors with substantial appreciated assets. While no strategy eliminates taxes entirely, thoughtful planning can help reduce unnecessary friction and create greater flexibility over time.
If you have questions about your portfolio, embedded gains, or potential strategies to improve tax efficiency, a proactive conversation can help clarify your options.
This article is for educational purposes only and does not constitute legal or tax advice. Individual circumstances vary, and planning decisions should be made with qualified professionals.