The Section 351 exchange, start to finish

Section 351 of the Internal Revenue Code lets an investor contribute property to a newly formed corporation and receive its stock without recognizing gain. Applied to ETFs, a group of investors contributes appreciated securities to a brand-new fund at launch and receives ETF shares in return. No sale occurs, so no capital gain is recognized at the transfer, and each contributed tax lot keeps its original cost basis and holding period.

No. Section 351 has been part of the Internal Revenue Code since 1954. Congress added it because reorganizing a business into a corporate structure produced no real economic gain and should not have been taxed as if it did. What is new is the application: using the same provision to seed a newly launched ETF with contributed securities. The first syndicated in-kind ETF launches by individual investors date to 2021.

No. It defers the tax. Cost basis and holding period carry over to the ETF shares, so the embedded gain travels with the position and is recognized when the shares are eventually sold. The advantage is compounding from a higher base, and the option to hold until a step-up in basis at death.

Generally no. Section 351 requires a contribution to a newly formed corporation, so the opportunity exists only in the window around a new fund's launch. Once the fund is trading, new shares are created through the normal ETF creation process, which is not a Section 351 transaction.

Investors diversify on a tax-deferred basis and keep assets in a liquid ETF structure. Advisors gain a high-value tax service, often consolidating held-away assets and avoiding the AUM erosion a taxable sale would cause. Issuers cover launch costs and reach scale from day one.

Measured against each contributing taxpayer's aggregated portfolio at the time of contribution: no single position may exceed 25% of contributed market value, and the five largest positions combined may not exceed 50%. A basket of only single stocks therefore needs at least 11 holdings. Many sponsors apply tighter internal limits, such as 22% and 47%.

An ETF or closed-end fund is not tested as a single position. Diversification looks through to its underlying holdings. A 30% position in a large-cap ETF that holds 7% Apple contributes 2.1% Apple to the test, which is then added to any Apple held directly or through other funds. Multiple share classes of the same issuer are combined into one position.

Yes. The exchange executes at the tax lot level, and lots are pulled from every account the taxpayer contributes from — taxable, joint, trust and so on — then aggregated into a single contribution per taxpayer. Diversification is tested on that aggregated total, not account by account.

A 351 exchange is not built to fix concentration on its own, because the contributed basket has to be diversified before it goes in. What often works is contributing part of the concentrated name alongside the rest of the diversified book, which lowers the weight without triggering the gain. If one name dominates the balance sheet, an exchange fund is usually the better tool — sometimes both are used together.

No. Cash is not a contributable security and does not count toward the tests. Sponsors often ask that a small cash balance remain in the contributing account so each investor can be delivered whole ETF shares rather than a fraction.

Taxable accounts of US persons: individual and joint brokerage accounts, most trusts, and S corporations. LLCs, partnerships and C corporations generally require additional review. Retirement accounts such as IRAs and 401(k)s are not eligible because there is no capital gain to defer. Some custodians also require the account to sit under an advisory relationship.

The advisor assembles positions and tax lots, tests the basket for diversification and eligibility, submits the portfolio and documents through the sponsor’s portal, and coordinates the custodian letter of authorization. The client reviews and signs the paperwork, understands that the fund’s strategy replaces their holdings, and leaves the positions untouched through the freeze.

Fund sponsors typically absorb the administrative cost of facilitating the exchange. The ongoing cost is the new ETF's expense ratio, which for 351-seeded funds has generally run between roughly 0.45% and 1.50% depending on strategy and manager.

A syndicated launch typically runs three to six months from marketing to trading. Onboarding and portfolio review happen one to three months before launch, securities transfer to the fund custodian one to two weeks out, ETF shares are delivered back within one to two business days of launch, and carried-over tax lot information reaches accounts within roughly two weeks.

Immediately. Shares trade on an exchange from the first trading day, with no lockup and no redemption restrictions. Selling realizes the deferred gain, because basis and holding period carried over.

It varies by sponsor. Schwab and Pershing are commonly supported on the brokerage side, with fund custody often at a bank such as U.S. Bank. Every client signs a letter of authorization issued by their own custodian, and those timelines are set by the custodian rather than the sponsor — start early.

Unchanged in substance. If a client contributed three ETFs across six tax lots, they hold one ETF with the same six lots — each keeping its original cost basis and acquisition date. Custodians do not all treat carried-over lots identically, so confirm post-transaction reporting with yours.

The contribution can be recharacterized as a taxable sale, triggering capital gains tax for the contributing investor. Because the control test is a group threshold, a failure at the fund level affects everyone in the transaction. That is why eligibility testing, documentation and strategy alignment happen before the deadline, not after.

Recharacterization as a taxable sale if the requirements are not met. New fund risk, since the receiving ETF has no operating history and no guarantee of reaching viable scale. Strategy risk, because the client ends up holding the fund’s strategy rather than their prior positions. And the possibility that tax law, IRS guidance or industry interpretation changes.

An exchange fund diversifies a concentrated single-stock position through a private partnership with roughly a seven-year holding period and about 20% in qualifying illiquid assets, limited to accredited investors or qualified purchasers. A 351 exchange moves an already diversified portfolio into a new ETF that trades on-exchange from day one with no lockup, generally open to US taxpayers. Different problems, and sometimes used together.

Volume tripled in 2025, and attention has followed. Two patterns draw the most: stuffing, where off-strategy or unwanted assets are pushed into a fund, and sequential seeding, where a wrapper exists mainly to deliver deferral. Deliberate eligibility analysis, documented rationale and genuine strategy alignment are what keep a file defensible.