QSBS Stacking via Non-Grantor Trusts: The $10M Multiplier

A founder holds 2 million shares of QSBS at a $0.001 basis per share. The company sells for $80 per share. Gross gain on the 2 million shares: $159.99 million. Under §1202 with a $10 million exclusion cap, the founder excludes $10 million of gain and pays federal tax on the remaining $150 million. Federal tax at 23.8%: roughly $35.7 million. Now introduce three non-grantor trusts, each established with separate economic terms and separate QSBS holdings. Each trust claims its own $10 million exclusion. The founder’s share of the exclusion plus three trusts equals $40 million of excluded gain. Federal tax falls from $35.7 million to $28.6 million. Savings: $7.1 million.

QSBS stacking is the practice of multiplying the §1202 exclusion cap across multiple taxpayers (typically the founder and several non-grantor trusts for family members). The IRS has not attacked the structure generally, but the requirements for valid stacking are technical. Missing the requirements risks collapsing the stack into a single exclusion, wasting the planning investment.

This guide walks through the structural requirements, the typical architecture, the tax-policy rationale, and the 2025 scrutiny landscape.

The $10M cap and the 10x-basis alternative

§1202(b) caps the per-taxpayer QSBS exclusion at the greater of:

• $10 million (reduced by QSBS gains excluded in prior years)
• 10 times the adjusted basis of the QSBS

The 10x-basis alternative matters for founders with large basis (e.g., from later-stage investments). For most founders with near-zero basis, the $10 million cap is the binding constraint.

Each taxpayer has their own $10M cap. Married couples filing jointly do not get $20M; they share one $10M cap as one taxpayer.

How stacking multiplies the cap

Different taxpayers each get their own $10M exclusion:

• The founder: $10M
• Non-grantor trust A: $10M
• Non-grantor trust B: $10M
• Non-grantor trust C: $10M
• etc.

Each trust is a separate taxpayer for federal income tax purposes if properly structured as a non-grantor trust. The IRS treats non-grantor trusts as independent entities with their own TINs, their own tax returns (Form 1041), and their own §1202 caps.

Transfer QSBS to each trust before sale, and each trust’s exclusion applies to the QSBS it holds.

The critical “non-grantor” distinction

Grantor trusts

A grantor trust is treated as the grantor for income-tax purposes. The grantor reports all income, including QSBS gain, on the grantor’s return. No separate exclusion cap. A grantor trust does not multiply the QSBS cap.

Grantor trust status is triggered by specific IRC §§671-679 powers retained by the grantor: power to revoke, income to the grantor or spouse, reversionary interest, control over beneficial enjoyment, administrative powers, etc.

Non-grantor trusts

Non-grantor trusts are treated as separate taxpayers. They file their own returns and pay their own tax. Income is either taxed at the trust level or distributed to beneficiaries who pay at their own rates.

For QSBS stacking, you want non-grantor status so the trust is a separate §1202 taxpayer with its own $10M cap.

Drafting a non-grantor trust

The trust agreement must exclude grantor powers. Typical drafting:

• No power to revoke
• No income to grantor or grantor’s spouse
• No reversionary interest
• No administrative powers that trigger grantor status
• Independent trustee with discretion over distributions

Careful drafting matters. A “defective grantor trust” accidentally triggers grantor status and collapses the stack.

The multiplier in practice

Typical stacking architecture

A founder with large QSBS holdings commonly sets up:

• Their own $10M exclusion
• Spousal lifetime access trust (SLAT) for the spouse, non-grantor, with $10M exclusion
• Children’s trusts (one per child), each non-grantor, each with $10M exclusion
• Sometimes: grandchildren’s trusts, sibling trusts, other family beneficiaries

A founder with 4 children can stack 6 separate $10M caps: self + spouse’s SLAT + 4 children’s trusts = $60M of combined exclusion.

Transferring QSBS to trusts

Transfer must be by gift (not sale) to preserve QSBS character under §1202(h)(1). The trust tacks the grantor’s holding period.

Gift-tax consequences: the gift consumes lifetime exemption. Using the 2025 $13.99M per person exemption (scheduled to reduce to ~$7M in 2026 under current law), a founder can gift substantial QSBS to trusts without current gift tax. Valuation discounts (DLOM, minority-interest) further stretch the exemption.

Timing relative to the sale

Transfer QSBS to trusts before the sale event. Post-sale transfers of cash do not preserve QSBS. The founder must gift QSBS shares, the trusts must hold until the sale, and the trusts claim the exclusion on their portion.

Best practice: set up trusts at least 6-12 months before the expected sale. Shorter windows attract scrutiny and raise step-transaction concerns.

The step-transaction risk

The IRS can challenge stacking under the step-transaction doctrine if the transfers to trusts were part of a pre-arranged plan to evade §1202’s single-taxpayer cap. Successful challenges collapse the transactions into a single effective transfer back to the founder.

To avoid step-transaction treatment:

• Establish trusts with independent purposes beyond tax savings
• Fund trusts well in advance of any sale negotiations
• Use independent trustees who make real decisions about trust investments
• Allow distributions to beneficiaries as part of normal trust operations
• Document the gift as a genuine transfer, not a placeholder

Non-grantor trust tax dynamics

Compressed brackets

Non-grantor trusts hit the top federal income tax bracket (37%) at only $15,200 of income (2025 threshold for trusts). Trust income that stays in the trust is taxed at high rates.

Distributable net income (DNI)

Income distributed to beneficiaries during the year shifts the tax burden to the beneficiaries (at their rates). Strategic distributions can reduce the overall tax.

For QSBS exclusion specifically, the exclusion applies at the trust level. The trust claims the exclusion on Form 1041. Excluded gain is not passed through to beneficiaries as income; it is excluded entirely.

State-level taxation

Non-grantor trusts face state-level taxation depending on the trust’s situs (governing law), the trustee’s location, and the beneficiaries’ residency. Establishing a trust in a zero-tax state (Delaware, Nevada, South Dakota, Wyoming, Alaska, or Florida) minimizes state-level tax on trust income.

California, New York, and other high-tax states apply their own tests to determine whether trust income is taxable. California taxes non-grantor trust income to the extent the trust has California trustees, California beneficiaries, or California-source income.

IRS scrutiny and recent developments

The IRS has not issued specific guidance on QSBS stacking. As of 2025, the practice continues without direct challenge, but scrutiny has increased in recent years. Key risk factors:

• Recently formed trusts with little independent activity
• Identical trust terms with no substantive differences
• Sale proceeds distributed back to the grantor’s spouse in a way that looks circular
• Contemporaneous sale and gift (no meaningful holding period in trust)

The safer structure: well-established trusts with independent trustees, meaningful duration before sale, and clear beneficiary benefits independent of the tax strategy.

Typical stacking fees and costs

• Trust drafting and legal setup: $5,000-$25,000 per trust
• Qualified appraisal for gift-tax purposes: $15,000-$50,000
• Annual trust administration: $5,000-$15,000 per trust per year
• Tax returns (Form 1041): $2,000-$7,000 per trust per year

Total upfront cost for a 4-trust structure: often $50,000-$150,000. Annual ongoing: $25,000-$75,000. The tax savings on $30-60 million of additional QSBS exclusion at 23.8% federal (plus 3.8% NIIT) runs $7-15 million or more, so the fees are a small fraction of the benefit.

Frequently asked

Can my revocable trust claim a separate QSBS exclusion?

No. Revocable trusts are grantor trusts. All income flows to the grantor’s return. No separate cap.

Does each child’s trust really get its own $10M?

Yes, if properly structured as a non-grantor trust with its own tax ID. Each trust is a separate federal taxpayer.

What if I want the trusts to benefit me?

Having the grantor as a beneficiary typically triggers grantor trust status. The structure collapses. Either exclude yourself as beneficiary or use different structures (e.g., your spouse’s SLAT can benefit you indirectly via the spouse).

Can the trust be in a state different from mine?

Yes. Trust situs determines governing law. Delaware, Nevada, and South Dakota are popular for asset protection and tax benefits. The choice affects state-level taxation and administrative law.

How does the 10x basis cap interact with stacking?

Each trust has its own basis (taking the donor’s basis under §1202(h)(1)). Each trust gets the greater of $10M or 10x its basis. For most founders with near-zero basis, the $10M cap is the binding constraint for each trust.

Can I stack after an acquisition term sheet?

Risky. Transfers after a deal is substantially negotiated may be disregarded under the step-transaction doctrine. Stacking must happen well before any deal becomes concrete.

Next step

If your QSBS position could produce gain above $10M, talk to an estate-planning attorney and CPA experienced with stacking. Budget 6-12 months for trust setup, funding, and initial holding period before any planned sale. Use separate trusts with independent trustees and real beneficial interests. Document the structure meticulously to withstand future scrutiny.