Section 351 Tax-Deferred ETF Diversification
Exchange appreciated securities for a diversified ETF without an immediate tax sale
- Difficulty
- Advanced
- Time to result
- ~months to results
- Steps
- 6
- Confidence
- 96%
Section 351 can turn a qualifying portfolio of appreciated securities into shares of a newly seeded ETF without treating the contribution as an immediate taxable sale. The investor first satisfies diversification tests: no position may exceed 25% of the contributed portfolio, while holdings above 5% must collectively represent less than 50%. Eligible stocks and look-through ETFs can be combined to meet those constraints. Multiple investors’ portfolios are then assembled as seed assets for the ETF, and contributors receive ETF shares in return. Their original cost basis transfers to those shares, so the capital gain is deferred rather than eliminated. Once launched, the ETF can use in-kind creation and redemption mechanics to manage holdings with fewer capital-gains distributions.
Origin
Meb Faber developed the open-enrollment application with ETF Architect after learning from Wes Gray and attorney Bob Elwood about Section 351 transactions previously conducted for closed groups of accounts.
Core principles
- 01Diversify concentrated equity before one company dominates portfolio risk.
- 02Defer taxes rather than assuming they disappear.
- 03Contribute a qualifying portfolio when the ETF is initially seeded.
- 04Use ETF creation and redemption mechanics to improve ongoing tax efficiency.
- 05Evaluate after-tax returns instead of focusing only on expense ratios.
How to run it
- 1
Diagnose the concentration
Calculate how much of the taxable portfolio is represented by each appreciated security and estimate the unrealized capital gain that a direct sale would realize.
Pro tip Compare the potential tax bill with the portfolio loss that a severe decline in the concentrated holding could cause.
Watch out Do not let tax avoidance obscure the investment risk of remaining concentrated.
- 2
Test the diversification rules
Construct a contribution portfolio in which no individual position exceeds 25% and all positions above 5% collectively remain below 50%.
Pro tip Eligible broad-market ETFs may provide look-through diversification when individual stocks alone do not satisfy the tests.
Watch out A single highly concentrated stock cannot simply be contributed by itself.
- 3
Screen the assets
Confirm that the proposed contribution consists of eligible securities such as stocks or ETFs and excludes private assets, cryptocurrency, futures, and options.
Pro tip Have tax and legal professionals verify eligibility before transferring assets.
Watch out Asset eligibility and tax treatment depend on the actual transaction structure.
- 4
Enter during fund seeding
Tender the qualifying securities during the ETF’s contribution window so they become part of the initial seed portfolio.
Pro tip Allow enough time for account aggregation, custody transfers, and document review.
Watch out Buying the ETF after launch does not reproduce the contributor’s Section 351 tax treatment.
- 5
Receive ETF shares
Exchange the contributed portfolio for ETF shares without recognizing an immediate sale, provided the transaction qualifies.
Pro tip Retain complete records of contributed lots, values, dates, and adjusted bases.
Watch out The embedded gain and original basis transfer to the ETF shares.
- 6
Manage the deferred liability
Hold or sell the ETF according to the broader financial plan, recognizing that selling the received shares can realize the deferred gain.
Pro tip Coordinate future sales with charitable giving, estate planning, or lower-income tax years where appropriate.
Watch out Tax deferral is not tax elimination.
In the wild
An investor owns appreciated Nvidia plus ten other eligible stocks. Rather than sell everything and immediately realize long-term gains, the investor adjusts the contribution weights to satisfy the 25% and 5%-50% tests, tenders the portfolio during ETF seeding, and receives diversified ETF shares carrying the original basis.
→ The investor reduces single-company exposure while deferring recognition of the embedded capital gain until the ETF shares are sold.
Common mistakes
Treating deferral as tax forgiveness
The original cost basis transfers to the ETF shares, so selling those shares can still trigger the deferred gain.
Trying to contribute one dominant stock
A portfolio that violates the diversification thresholds will not qualify merely because the investor wants diversification.
Missing the contribution window
An investor must participate in the qualifying seed transaction; purchasing ordinary ETF shares after launch is different.
Is it for you?
Best for
It is best for taxable investors with large unrealized gains and a sufficiently diversified set of eligible stocks or ETFs.
Not ideal for
It is not ideal for investors needing immediate liquidity, holding only one dominant security, or expecting permanent forgiveness of capital-gains tax.
From the transcript
“there's two main rules to qualify. The first is no position can be above twenty five percent.”
“Second is anything that's over five percent has to be less than fifty percent.”
“the benefit is a tax deferral. It's not a trans taxable transaction from seeding the fund to getting the ETF in return.”
From the episode
At the Money: Deferring Capital Gains on Appreciated Equity