QSBS Tax Strategy for Founders

What Is a QSBS Stacking Trust? How Founders Multiply the $15M Tax Exclusion

A QSBS stacking trust is an irrevocable non-grantor trust that holds qualified small business stock under Section 1202, creating a separate taxpayer that can claim its own full capital gains exclusion when the stock is sold. By distributing shares across multiple trusts and family members before a liquidity event, founders may multiply the total gain excluded from federal capital gains tax, depending on individual circumstances and proper structuring.

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Under the One Big Beautiful Bill Act (OBBB) of 2025, the per-taxpayer exclusion cap increased from $10 million to $15 million for QSBS issued after July 4, 2025. For stock issued on or before that date, the $10 million cap continues to apply. In both cases, the exclusion is the greater of the fixed dollar cap or 10 times the taxpayer's adjusted basis in the shares sold.

So here's how this can play out - for a founder with $60 million in eligible QSBS gain, a single taxpayer can only exclude up to the $15mn (or $10mn) per-issuer cap.

However, if the founder's same ownership was properly distributed across four Trusts and entities, each their own separate taxpayer number/EIN (the founder plus three irrevocable non-grantor trusts), the combined federal exclusion could reach $60 million if each taxpayer holds shares with sufficient gain, subject to IRS scrutiny and anti-abuse rules.

This is the mechanism that makes QSBS stacking for founders one of the most significant tax planning structures available to entrepreneurs facing a business sale.

The Mechanics

How QSBS Stacking Works: The Core Mechanism

Section 1202 of the Internal Revenue Code allows eligible taxpayers to exclude a portion of capital gains from the sale of qualified small business stock. The exclusion is applied per taxpayer per issuing corporation. This per-taxpayer structure is what makes stacking possible.

A taxpayer is not limited to an individual. Irrevocable non-grantor trusts are treated as separate taxpayers for federal income tax purposes. Each trust can claim its own exclusion amount when it sells QSBS it holds, independent of the founder's personal exclusion.

Stacking

Distributes shares to multiple taxpayers (trusts or individuals) to multiply exclusions. Each taxpayer claims its own separate Section 1202 exclusion when selling its respective shares.

Packing

Transfers shares to a single trust designed to hold multiple sub-funds, each treated as a separate issuer. This is a different technique with distinct legal and tax considerations.

Both strategies carry distinct legal and tax risks, and neither is assured of withstanding IRS challenge without careful structuring and documentation. The information on this page is educational and does not constitute tax or legal advice.

Before Stacking

Who Qualifies for QSBS Stacking: Section 1202 Eligibility

Before stacking is even relevant, the underlying stock must qualify as QSBS. Several requirements must be met, and they are non-negotiable. The 2-year rule for QSBS is the upstream eligibility gate that determines whether your stock qualifies at all.

C Corporation

The stock must be issued by a domestic C corporation. S corps, LLCs, and partnerships do not qualify.

Original Issuance

The stock must be acquired directly from the corporation at issuance. Secondary purchases generally do not qualify.

Active Business

At least 80 percent of the corporation's assets must be used in a qualified trade or business. See the 80% rule for QSBS.

Gross Assets Limit

Aggregate gross assets must not exceed $75 million at all times before and immediately after the stock issuance.

5-Year Hold

The stock must be held for at least five years to claim the full exclusion. Shorter holds may qualify for partial treatment or rollover deferral under Section 1045.

Per-Taxpayer Cap

The exclusion is the greater of $15 million (for stock issued after July 4, 2025) or 10x adjusted basis, applied per taxpayer per issuer.

Implementation

How to Set Up a QSBS Stacking Trust: Step by Step

The following steps outline the general process. Every founder's situation is unique, and these steps should be executed in coordination with an estate attorney, CPA, and wealth advisor.

Confirm QSBS Eligibility Before Anything Else

Before considering any stacking strategy, confirm that your stock meets all Section 1202 requirements. This includes verifying that the corporation was a C corp at the time of stock issuance, that aggregate gross assets did not exceed $75 million, and that you acquired the stock at original issuance. Stock purchased on the secondary market generally does not qualify. The 2-year rule is the first checkpoint; the 80% rule is the second.

Transfer Shares Early, Ideally Before Any Sale Process

Shares should be transferred to trusts well before a liquidity event. If shares are transferred too close to a sale, the IRS may challenge the transfer as an "assignment of income" rather than a legitimate gift. Ideally, transfers should occur at company formation or years before any anticipated exit. The earlier the transfer, the stronger the position that the trust, not the founder, is the true seller at the time of the transaction.

Establish Separate Irrevocable Non-Grantor Trusts

Each trust must be a genuinely independent irrevocable non-grantor trust. A grantor trust, where the founder is treated as the owner for tax purposes, would not create a separate taxpayer and would defeat the purpose of stacking. Each trust should have its own trustee, its own beneficiaries, and its own tax identification number.

Structure the Trusts for Estate Planning Simultaneously

QSBS stacking is rarely done in isolation. The same trust structures used for stacking can serve estate planning purposes, removing appreciation from the founder's taxable estate and providing creditor protection for family members. This dual-purpose approach requires coordination between your wealth advisor, estate attorney, and CPA.

Execute the Sale and Claim Exclusions

When the company is sold, each taxpayer (the founder and each trust) sells its respective shares and claims its own exclusion on its own tax return. Each trust's exclusion is calculated independently based on the greater of the applicable dollar cap ($10 million or $15 million depending on issuance date) or 10 times the trust's adjusted basis in the shares it holds. The 28% QSBS tax on non-excluded gain may apply at the trust level.

Critical Considerations

Key Rules and Risks That Can Unwind a Stacking Strategy

QSBS stacking can create meaningful tax savings for founders, but it carries real risks. Every benefit below is paired with its corresponding limitation because understanding both sides is essential to evaluating whether this strategy fits your situation.

Assignment of Income Doctrine

The most significant risk to any QSBS stacking strategy. If the IRS determines that a founder transferred shares merely to avoid tax on an imminent sale rather than as a genuine gift, the trust may be disregarded and all gain taxed to the founder. This risk increases dramatically when transfers occur close to a sale.

Anti-Abuse Rules

The IRS can recharacterize transactions lacking economic substance. A stacking strategy that exists solely for tax avoidance, without genuine estate planning or asset protection purpose, may be challenged. Documentation of the non-tax purposes of the trust structure is critical.

Per-Issuer Limitation

The exclusion applies per taxpayer per issuing corporation. All QSBS from the same company sold by the same taxpayer in the same year is aggregated. Transferring shares to a new taxpayer creates a new, separate cap for that taxpayer; it does not increase the original holder's cap.

Trust Tax Bracket Compression

Non-grantor trusts reach the 37 percent federal income tax rate at approximately $16,000 of income in 2026. If a trust sells QSBS and has gain exceeding its exclusion amount, the excess may be taxed at the maximum federal rate quickly. The 10x basis alternative may help offset this in some cases, but compression is a planning factor that must be modeled.

Pennsylvania State Tax Treatment

Pennsylvania taxes capital gains as ordinary income at a flat 3.07 percent rate, with no preferential rate for long-term gains. Pennsylvania does not conform to the federal QSBS exclusion, meaning that while a trust may exclude gain federally under Section 1202, the same gain may be subject to Pennsylvania state income tax. Additionally, Pennsylvania prohibits installment reporting for stock sales, meaning the full state tax obligation is due in Year 1 regardless of payment timing. For founders in Pennsylvania, the state capital gains rules add a layer that many federal-only plans overlook.

Beyond the Tax Technique

How QSBS Stacking Fits Into a Broader Wealth Plan

The irrevocable trusts used for QSBS stacking can simultaneously remove future appreciation from the founder's taxable estate, provide creditor protection for beneficiaries, and establish a governance framework for multi-generational wealth. This integration is where the strategy moves from a tax technique to a foundational wealth structure.

For founders approaching a significant liquidity event, the trust structure created for QSBS stacking can serve as the starting point for a more comprehensive family office governance model. The trusts create defined ownership silos, designated trustees, and beneficiary frameworks that align with how family offices coordinate investment, tax, and estate decisions across generations.

Coordination With Your Advisory Team

QSBS stacking requires coordination among at least three professionals:

1 Estate attorney to draft the irrevocable trust documents and ensure state-law compliance
2 CPA to file trust tax returns, and coordinate with the founder's personal return
3 Wealth advisor to plan for taxes and integrate the strategy with your overall financial plan, ensuring no unintended consequences in investment allocation, charitable giving, or retirement income planning

At Defiant Capital Group, we serve as the wealth advisor in this coordination, working alongside your attorney and CPA to ensure the stacking strategy aligns with your broader wealth management plan for founders and entrepreneurs.

Common Questions

Frequently Asked Questions About QSBS Stacking Trusts

What Is a QSBS Stacking Trust?

A QSBS stacking trust is an irrevocable non-grantor trust that holds qualified small business stock. Because the trust is a separate taxpayer for federal income tax purposes, it can claim its own Section 1202 capital gains exclusion when the stock is sold, independent of the founder's personal exclusion. Multiple trusts can multiply the total excluded gain across taxpayers, subject to IRS rules and anti-abuse limitations.

Can a Trust Hold 1202 Stock?

Yes, an irrevocable non-grantor trust can hold Section 1202 qualified small business stock, provided the stock was originally issued to the trust or transferred to it as a gift. The trust must be a non-grantor trust to qualify as a separate taxpayer. A grantor trust would be treated as the grantor for tax purposes and would not create an additional exclusion.

What Is the 5 by 5 Rule for Trusts?

The 5 by 5 power is a trust provision that allows a beneficiary to withdraw the greater of $5,000 or 5 percent of trust principal each year. This is relevant to estate planning because it can affect whether a trust is included in a beneficiary's estate. The 5 by 5 rule is distinct from the QSBS 5-year holding period requirement, which governs how long stock must be held before the Section 1202 exclusion can be claimed.

What Are the New Rules for 1202 Stock?

Under the One Big Beautiful Bill Act (OBBB) of 2025, the per-taxpayer exclusion cap increased from $10 million to $15 million for QSBS issued after July 4, 2025. For stock issued on or before that date, the $10 million cap continues to apply. The 10x basis alternative remains unchanged. The $15 million cap is indexed for inflation in years after 2026. Tax treatment varies by individual circumstances, and these limits are applied per taxpayer per issuing corporation.

What Is the 120 Day Rule for Trusts?

The 120-day rule refers to the period during which a beneficiary can exercise a withdrawal right (such as a Crummey power) over property contributed to a trust. If the beneficiary does not withdraw the property within 120 days of the contribution, it remains in the trust. This is relevant for gift-tax exclusion purposes and is separate from QSBS stacking mechanics, though both may apply in the same trust structure.

Confirm Before the Window Closes

QSBS Stacking Requires Planning Before the Sale, Not After

Many of the most effective QSBS stacking strategies require transfers to trusts years before a liquidity event. By the time you are talking to buyers, the planning window for most meaningful structures has already closed. If you are a founder with eligible QSBS and a potential exit on the horizon, the time to evaluate stacking is now.

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