QSBS Stacking Under Treasury Scrutiny: What Founders Should Know Now
The short answer
Treasury and the IRS are drafting guidance aimed at QSBS stacking, and senior Treasury officials have signaled that aggressive multi-trust structures are the target. No notice, proposed regulation, or revenue ruling has been issued yet, and stacking remains permitted under current law. Founders planning a liquidity event in the next several years should treat the period before guidance is published as a window in which the rules may change.
Our view is that well-designed stacking, built on genuine family and estate planning and executed well before any sale, is likely to survive. Structures that multiply trusts for the same beneficiaries, or that are funded on the eve of an exit, are the ones most exposed.
How stacking works
Section 1202 lets a noncorporate taxpayer exclude gain on qualified small business stock, up to the greater of a dollar cap or 10 times basis. The cap is applied per taxpayer, per issuer. It is $10 million for stock acquired on or before 4 July 2025, and $15 million for stock acquired after that date, indexed for inflation beginning after 2026.
Two features of the statute make stacking possible:
- Per-taxpayer cap. Each separate taxpayer gets its own exclusion. A properly structured nongrantor trust is a separate taxpayer.
- Gift carryover. Under Section 1202(h), stock transferred by gift keeps its QSBS character, and the recipient takes the donor's holding period.
A founder who expects gain well above the cap can therefore gift shares to irrevocable nongrantor trusts for family members. Each trust may claim its own exclusion. With four trusts plus the founder, a family could in principle shelter $75 million of gain on post-4 July 2025 stock rather than $15 million.
Spousal lifetime access nongrantor trusts (SLANTs) extend the approach to a founder's spouse. They require careful drafting, because the spouse's interest must not cause grantor trust status under Sections 672(e) and 677.
What we know about the guidance being drafted
The Wall Street Journal reported on 29 June 2026 that Treasury and the IRS are drafting guidance aimed at the more aggressive versions of stacking. Its likely shape comes from public remarks by the officials who will write it.
- Target. Treasury officials, including Kenneth Kies, Assistant Secretary for Tax Policy and acting IRS Chief Counsel, have reportedly focused on what they describe as the same-beneficiary problem: several trusts for the same person, rather than ordinary family planning.
- Posture. Kies reportedly told a practitioner audience that Treasury does not like stacking, and Treasury attorney-adviser Evan Adams has made similar comments.
- Status. No notice, proposed regulation, or ruling has been released. Timing, legal basis, and effective date are all open.
The most important detail is the same-beneficiary framing. It suggests the guidance will target multiplication, meaning several trusts for the same beneficiary, rather than the core technique of giving one exclusion to each family member.
Where guidance could come from
Treasury has three plausible routes, and each reaches a different set of structures.
Section 643(f), the multiple-trust rule. It treats two or more trusts as one if they have substantially the same grantor and primary beneficiaries and a principal purpose of tax avoidance. Treasury finalized an implementing regulation, Treas. Reg. 1.643(f)-1, in 2019. The rule fits duplicate trusts for the same beneficiary almost exactly. The weakness is textual: Section 643(f) applies "for purposes of this subchapter," meaning Subchapter J, while Section 1202 sits in Subchapter P. Using it to deny a Section 1202 exclusion invites a challenge.
Section 1202(k), QSBS-specific regulatory authority. Congress directed Treasury to write regulations preventing avoidance of Section 1202's purposes through split-ups, shell corporations, partnerships, "or otherwise." This is a cleaner foundation for an anti-stacking rule, though it has rarely been used and any rule would need to square with the express gift provision in Section 1202(h).
Existing judicial doctrines. Even without new rules, the IRS can argue step transaction, substance over form, assignment of income, or sham trust in an audit. These doctrines apply case by case and hit hardest when gifts are made close to a sale or trusts lack real independence.
One statutory detail cuts against the most aggressive designs. Section 1202(b)(3) splits the cap between spouses filing separately, which shows Congress intended a married couple to share one exclusion. Structures that recreate a second spousal exclusion without a real change in beneficial interest may draw attention on that basis.
Will new rules reach existing trusts?
Probably not for well-built structures, but it cannot be ruled out. Section 7805(b) generally bars a regulation from applying before the earliest of its final publication, its proposal, or a notice describing its expected contents. That means the first notice or proposed regulation is likely to set the effective date.
There are two caveats. Section 7805(b)(3) allows retroactive rules to prevent abuse. And the government has suggested that aggressive stacking was never permitted under existing anti-abuse doctrines, a position it could press in audits of trusts formed before any guidance.
The practical conclusion: structures that would be defensible today on their own facts are the ones most likely to be protected, whatever the effective date.
Which structures are most exposed
Risk tracks two things: how many trusts share the same beneficiaries, and how close the gifts are to a sale.
| Risk | Design | Why |
|---|---|---|
| Lower | One nongrantor trust per distinct family member, funded years before any exit, with independent trustees and real distribution terms | Matches the model Treasury officials have described as ordinary family planning |
| Lower | A properly drafted SLANT funded early, where the spouse's interest is subject to adverse-party consent | Grounded in Section 1202(h) and long-standing trust law; depends on drafting quality |
| Moderate | Trusts with overlapping beneficiaries, such as a trust for each child plus a pooled trust for all descendants | Overlap is where Section 643(f)-style aggregation would bite |
| Moderate | Gifts made after a letter of intent, term sheet, or active sale process | Assignment-of-income and step-transaction exposure |
| Higher | Several trusts for the same beneficiary that differ only in name, trustee, or minor terms | The same-beneficiary pattern Treasury officials have described |
| Higher | Trusts for remote relatives or unrelated people with no real estate planning purpose | Hard to show a non-tax purpose |
This tiering reflects our reading of the public statements and the statute. It is not a prediction of what the final guidance will say.
What founders should do now
- Don't stop planning, but don't wait for the deadline either. If stacking fits your family's goals, gifts made sooner are cheaper in gift-tax terms and further from any sale. Waiting for guidance may mean planning under stricter rules.
- Build one trust per real beneficiary. Avoid adding trusts whose only purpose is another exclusion.
- Document the non-tax purpose. Asset protection, succession, and support for specific family members should be reflected in the trust terms, not just a memo.
- Get a defensible valuation for every gift. Each transfer is a taxable gift and uses lifetime exemption.
- Confirm QSBS qualification first. Stacking multiplies an exclusion only if the stock qualifies, including the gross-assets test, active business requirement, and holding period.
- Review existing structures. If you already have multiple trusts, look now at beneficiary overlap, trustee independence, and funding dates.
- Watch for a notice or proposed regulation. Its release date may fix the effective date for new rules.
How we can help
Vickery Law designs QSBS stacking and SLANT structures for founders and their families, with an eye to how each structure would be defended if guidance issues. If you are considering stacking, or already have trusts in place, we can review your plan against the current Treasury signals and the likely legal bases for new rules.
This article is for general information only and is not legal or tax advice. It reflects publicly available information as of 26 September 2026. Treasury guidance may issue at any time and could change the analysis. Vickery Law PLLC is licensed in Maryland, the District of Columbia, and Washington State.
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Notice. General information for educational purposes only, not legal or tax advice, and no attorney-client relationship is created by reading it. Whether anything described here applies to you depends on your own facts, and the law changes.