Qualified Small Business Stock (QSBS) Stacking Explained: How to Multiply Your Section 1202 Exclusion

For families whose wealth is concentrated in qualified small business stock, a future liquidity event often raises two related questions: How can the tax burden be managed, and how can wealth be transferred efficiently to future generations? QSBS stacking is a planning strategy designed to address both.

Under Section 1202, a shareholder selling qualified small business stock can exclude up to $10 million of capital gain, or $15 million for shares issued after July 4, 2025. Most founders treat that cap as the ceiling on what they can shelter. It isn’t.

The exclusion applies per taxpayer, and the IRS treats certain irrevocable trusts as separate taxpayers. This creates a planning opportunity: when QSBS is gifted to trusts established for family members, each trust may carry its own exclusion.. A founder with a large gain can move from sheltering $10 million to sheltering $40, $60, or even $80 million while passing real wealth to the next generation in the process. The trusts are genuine and irrevocable: the shares leave your hands for good. That’s the cost and the point.

The planning opportunities discussed here depend on the underlying Section 1202 framework. For a detailed discussion of QSBS eligibility, holding periods, and exclusion rules, see our QSBS overview.

• Stacking multiplies the Section 1202 exclusion across taxpaying entities. The exclusion applies per taxpayer, and a non-grantor trust counts as its own taxpayer, so gifting QSBS to multiple irrevocable family trusts can shelter far more gain than a single $10 million (or $15 million) cap allows.
• The shares irrevocably leave your estate and belong to the trusts’ beneficiaries. Stacking only works because you’re actually transferring wealth.
• Only non-grantor trusts qualify. A grantor trust is treated as an extension of you, so its gain flows back to your return and adds nothing.
• The One Big Beautiful Bill Act expanded Section 1202. For QSBS acquired after July 4, 2025, the per-taxpayer cap rises to $15 million, and the gross asset test rises to $75 million.

QSBS stacking means gifting your qualified small business stock to several irrevocable trusts, usually set up for your children or other family members, before you sell the company. Each properly structured non-grantor trust may be treated as a separate taxpayer in the eyes of the IRS, allowing each trust to potentially claim its own Section 1202 exclusion. The more trusts that hold shares, the more of your gain escapes federal tax, because the exclusion is capped per taxpaying entity, not per family.

This works because of how Section 1202(b)(1) is written: the exclusion applies to each taxpayer separately, for each company whose stock they hold. A non-grantor trust is its own taxpayer, fully distinct from you, so its exclusion stands on its own and doesn’t eat into yours.

For Example:

Say you’re sitting on $50 million of QSBS gain. On your own, you exclude $10 million and owe tax on the other $40 million. But if you gift shares to four irrevocable trusts for your children before the sale, you now have five taxpayers: you and the four trusts, each with its own $10 million exclusion. That covers the full $50 million.

These are real, irrevocable gifts. The shares, and all their future appreciation, leave your estate and belong to the trusts’ beneficiaries. You’re not parking stock in entities you control and pulling it back after the sale; that wouldn’t survive the IRS’s anti-abuse rules, and it isn’t what stacking is. The exclusion multiplies precisely because you’re genuinely transferring wealth to your family.

1. Establish non-grantor trusts. Work with an estate planning attorney to create irrevocable trusts that avoid grantor trust status under Sections 671 through 679. Each trust needs its own EIN and independent trustee.
2. Gift QSBS shares to each trust. Transfer shares well before an anticipated exit. Each gift uses a portion of your lifetime gift tax exemption: $15 million in 2026, up from $13.99 million in 2025 under the One Big Beautiful Bill Act. You’ll file Form 709 for each transfer.
3. Each trust holds the shares until the sale. When shares are sold, each trust claims its own Section 1202 exclusion, up to $10 million (or $15 million for post-OBBBA shares) per trust.

The Five-year Clock

Section 1202 requires QSBS to be held for at least 5 years before the full exclusion applies, with partial exclusions at 3 and 4 years for post-OBBBA shares. Gifting doesn’t restart that clock. Under Section 1202(h), the trust inherits both the QSBS status and your original acquisition date, so a trust can sell soon after receiving the shares, as long as you’d already held them long enough before the gift.

Grantor Trusts Don’t Work

A grantor trust is treated as an extension of the grantor for income tax purposes. If you gift QSBS to a grantor trust, the trust’s gain flows back to your personal return, and you’ve gained nothing.

The 80% Active Business Test

Throughout the holding period, the company must keep using at least 80% of its assets in a qualified trade or business. If it fails this test for any meaningful stretch, the QSBS exclusion can be lost for every taxpayer in the stack.

Consider two founders at different gain levels, both holding QSBS issued before July 4, 2025 (subject to the $10M cap).

Scenario A: Founder with $40M gain retains shares personally and gifts to three trusts. Four taxpayers, each claiming $10 million.

Scenario B: Founder with $60M gain creates five trusts plus retains shares. Six taxpayers, each claiming $10 million.

Note: The 23.8% combined federal rate reflects the 20% long-term capital gains tax rate plus the 3.8% Net Investment Income Tax (NIIT). Even after legal fees ($15,000 to $30,000 per trust), the economics are decisive.

If stacking multiplies the number of exclusions across taxpayers, packing enlarges a single taxpayer’s exclusion. Same statute, different angle.

Section 1202 actually has two caps, and you get the higher of the two: a flat dollar cap of $10 million (or $15 million post-OBBBA), or ten times your tax basis in the stock. For most founders, basis is tiny because you paid almost nothing for your original shares, so ten times that stays well below the dollar cap, and the dollar cap is what binds. Packing flips this by deliberately raising the basis until the 10x ceiling becomes the higher number.

The math sets the threshold. To clear $10 million, your basis has to exceed $1 million, because 10 × $1 million = $10 million. Post-OBBBA, the threshold is $1.5 million against the $15 million cap. You can increase basis by contributing cash above that line, or appreciated property, in exchange for QSBS. For property, Section 1202 deems your basis to be the fair market value at the time of contribution. So, contributing a $40 million asset gives you $40 million of Section 1202 basis and a 10x ceiling of $400 million.

Stacking and packing can be used together.

Converting an LLC to a C-Corp

A business owner whose company started as an LLC or partnership can convert it to a C corporation. For QSBS purposes, the business is valued at its fair market value on the conversion date, and that value becomes the 10x basis, often far above what was originally invested.

The trade-off is timing. The five-year clock starts at conversion, not at founding, and the gross asset test is measured at the conversion-date value. Convert too late, after the business has grown past $50 million ($75 million post-OBBBA), and the stock won’t qualify at all.

What Packing Doesn’t Do

Packing raises the cap on future gain. It does not shelter gains that have already built up in the contributed property or business; that pre-conversion appreciation stays taxable under Section 1202(i)(2).

Several trust structures qualify as non-grantor taxpayers for Section 1202 purposes. The right choice depends on your family situation, state of residence, and estate planning goals.

Non-Grantor Irrevocable Trusts (for Children)

This is the most straightforward approach. You create irrevocable trusts for the benefit of your children, gift QSBS shares, and appoint an independent trustee. Each trust is a separate taxpayer. The trust terms must avoid the grantor trust rules, meaning you cannot retain certain powers over trust income or principal. When the aim is to benefit children and later grandchildren, these are often drafted as dynasty trusts: long-term, GST-exempt vehicles that keep the assets working across generations.

Non-Grantor Trusts Sited in a No-Income-Tax State

The same structure, set up in a state like Nevada, Delaware, or Wyoming. It still removes assets from your estate, gets its own federal exclusion, and can reduce state income tax in some cases. Whether it actually saves you state tax depends on where the trustees and beneficiaries live, so map it out with your attorney and CPA.

Spousal Lifetime Access Non-Grantor Trusts (SLANTs)

A SLANT names your spouse as a beneficiary, so your household keeps indirect access to the assets while the trust still functions as a separate taxpayer with its own Section 1202 exclusion. It takes careful drafting: a spousal beneficiary normally triggers grantor-trust status under Section 677, so distributions to your spouse usually have to be gated through an independent or adverse party to keep the trust genuinely non-grantor.

Charitable Remainder Trusts (CRTs)

A CRT works differently from the trusts above. It isn’t a way to add another Section 1202 exclusion. A CRT is tax-exempt, so it owes no tax when it sells the stock, with or without Section 1202. What it offers instead is a charitable deduction up front, an income stream back to you for a term of years or life, and a remainder that ultimately goes to charity. You still pay tax on the gain as it’s distributed to you over time, but spread out rather than all at once. For founders with genuine philanthropic goals, or with gain beyond what stacking can shelter, a CRT can be a useful complement. It’s a different lever, not another exclusion in the stack.

The key requirement across all stacking structures: each trust must qualify as a non-grantor trust. Any trust that fails the non-grantor test provides zero additional exclusion.

Stacking is not appropriate for every QSBS holder. The decision framework comes down to expected gain relative to cost and complexity.

Stacking clearly makes sense when your anticipated gain substantially exceeds the per-taxpayer cap. If you’re sitting on $30 million or more in unrealized QSBS gains, the federal tax savings from even two additional trusts dwarf the setup costs.

Stacking is likely overkill when your total gain is under approximately $12 to $15 million. At that level, your personal exclusion (plus a spouse’s) covers the gain. The legal fees and gift tax implications don’t justify the marginal benefit.

Even if your gain is large enough to make stacking worthwhile, weigh a few other factors:

• Cost and complexity. Multiple trusts mean multiple legal bills up front and annual tax filings going forward.
• Gift tax exemption. Each transfer uses part of your $15 million lifetime exemption (2026).
• State tax. Stacking is a federal benefit only. States that don’t conform to Section 1202, including California, still tax the gain.
• IRS scrutiny is increasing (discussed below). Acting sooner reduces exposure to future guidance.

A practical threshold: if your projected gain is 2x or more above the single-taxpayer cap, the conversation with your estate planning attorney should happen now.

QSBS stacking is currently permitted: the statute provides a per-taxpayer exclusion, Section 1202(h) preserves QSBS status on gifted shares, and no Treasury regulation or IRS guidance prohibits it. But regulatory sentiment is shifting. At a May 2026 conference, tax policy advisor Kenneth Kies relayed that Treasury officials don’t like stacking. That’s not a rule, but it points to where the rules may go.

Three specific risks to watch:

• New guidance. The Treasury or the IRS could issue regulations that limit or recharacterize stacking.
• Section 643(f) anti-abuse rule. The IRS can treat multiple trusts with substantially the same grantors and beneficiaries as a single trust. Careful design, with genuinely different beneficiaries and independent trustees, mitigates this risk.
• Future guidance could, in theory, reach back to completed transactions, though retroactive application faces meaningful legal challenges.
• Compliance multiplier. Each trust is a separate taxpayer and must independently prove QSBS eligibility for the duration of its own holding period. If the company fails the 80% active-business test for any window inside that period, every trust in the stack can lose the exclusion at once.

The OBBBA’s broader expansion of Section 1202 (the $15 million cap and $75 million gross asset test for post-July 4, 2025 shares) signals congressional support, but doesn’t settle the stacking question. If you are considering this strategy, the timing of any decisions is worth discussing with your tax attorney and CPA sooner rather than later.

Does California conform to Section 1202 for stacking purposes?

No. California does not conform to Section 1202 at all. The state taxes QSBS gains as ordinary capital gains regardless of federal exclusion status. Federal savings from stacking are partially offset by a California tax bill up to 13.3%.

How does the exclusion work for married couples filing separately?

For QSBS acquired on or after July 5, 2025, the $15 million per-taxpayer exclusion is split equally for spouses who file separately, giving each $7.5 million against the same issuer. Filing jointly preserves the full $15 million combined cap, so the choice of filing status is part of the planning.

Can I stack the exclusion across QSBS in different companies?

Yes. The per-taxpayer cap applies per issuer, so each company’s stock has its own cap. A founder holding QSBS in two qualifying companies can claim up to $15 million per company per taxpayer, and stacking through trusts works the same way for each.

What happens to a SLANT if my spouse and I divorce?

The SLANT survives the divorce as an irrevocable trust. Once they’re no longer your spouse, you lose the path back to the assets. This is the central risk of any spousal-access trust and one reason it requires careful design.

Where QSBS Stacking Fits in Your Estate Plan

QSBS stacking is one piece of a broader estate plan, not a standalone move. The decisions about how much to gift, which trust structures to use, and when to fund them shape liquidity, control, and what your family ultimately inherits. Summitry works with founders and early employees whose wealth is concentrated in private company equity, coordinating with your tax attorney and CPA to align Section 1202 planning with the rest of your financial picture.

If you’re approaching a liquidity event or weighing whether stacking fits your situation, we’d welcome a conversation.

This material is intended for general informational purposes only, and should not be construed as legal, tax, investment, financial, or other advice. It does not consider the specific investment objectives, tax and financial condition or needs of any specific person. To the extent that this material concerns tax matters, it is not intended or written to be used, and cannot be used, by a taxpayer for the purpose of avoiding penalties that may be imposed by law. Investing involves the risk of loss, including loss of principal.

Summitry, LLC is a registered investment advisor in the State of California. For more information about Summitry, including fees and services, please see our Form ADV Part 2A or contact us directly.