Understanding the QSBS Per-Taxpayer Exclusion Limit

Here’s something most founders don’t fully grasp until they’re already in a deal: the QSBS exclusion doesn’t scale with the size of your company’s exit. It scales with the number of taxpayers or certain types of trusts holding your stock.

That single distinction, per taxpayer versus per deal, is where millions of dollars in tax savings get created or left on the table.

Section 1202 of the Internal Revenue Code allows qualifying shareholders to exclude significant capital gains when selling Qualified Small Business Stock (QSBS). That exclusion cap is not shared. It applies individually to each taxpayer who holds qualifying shares. Understanding how this works, and how founders structure their equity to maximize it, is one of the highest-leverage planning moves available before a liquidity event.

In this article:

• What “Per Taxpayer, Per Issuer” Actually Means
• The Married Filing Separately Rule
• How Founders Use the Per-Taxpayer Structure Strategically
• A Real-World Stacking Scenario
• What Can Disqualify the Transfer Strategy
• The 10x Basis Alternative: When It Beats the Dollar Cap

What “Per Taxpayer, Per Issuer” Actually Means

The exclusion cap under Section 1202 applies on a per-taxpayer, per-issuer basis. That means for each qualifying company’s stock you hold, you as an individual can exclude up to the greater of:

• The per-issuer dollar limit, or
• 10 times your aggregate adjusted basis in that stock

The “per-issuer” part also matters: the exclusion cap resets for each qualifying company. If you hold QSBS in three different startups, you can claim up to your full cap on each one.

The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, raised the dollar cap for newly issued stock. Here’s where things stand now:

Note that the cap governs how much gain is eligible; the exclusion percentage governs how much of that eligible gain escapes tax. For stock acquired before 9/28/2010, only 50% or 75% of gain is excluded depending on acquisition date. For stock acquired after July 4, 2025, the OBBBA replaced the five-year cliff with tiers: 50% exclusion at three years, 75% at four, and 100% at five or more. Under the partial tiers, the non-excluded portion of Section 1202 gain is taxed at a maximum 28% federal rate plus the 3.8% NIIT (31.8%), not the standard 23.8% long-term capital gains rate.

If you hold both pre- and post-OBBBA stock in the same company, the caps don’t stack: the law coordinates them into a single aggregated per-issuer limit, and shares acquired on or before July 4, 2025 remain subject to the $10 million cap regardless of when they’re sold. Gifting pre-OBBBA shares doesn’t upgrade them either. The recipient inherits the donor’s acquisition date and the pre-OBBBA regime. Tracking issuance dates share-by-share is essential.

That $5 million increase matters, but the more important point is what “per taxpayer” enables when founders plan ahead.

The Married Filing Separately Rule

One of the most overlooked details in QSBS planning involves married couples. Section 1202(b)(3) includes a specific provision: if married individuals file separate tax returns, each spouse’s per-issuer dollar cap is cut in half. The OBBBA confirmed this treatment, halving the new $15 million limit accordingly.

Technically, §1202(b)(3) divides the joint-return cap equally between spouses for purposes of tracking prior-year exclusions. The practical effect is one combined cap per couple. Practitioners disagree on whether spouses who each separately own QSBS of the same issuer can claim two caps; the conservative position is one.

Filing jointly preserves the full exclusion cap. Filing separately halves it. For a founder with $15 million or more in QSBS gains, the filing status decision alone could affect the federal tax outcome by millions of dollars.

This should be an explicit conversation with your tax advisor before the year you expect to close, not after.

How Founders Use the Per-Taxpayer Structure Strategically

Because the exclusion cap applies to each qualifying taxpayer independently, founders who transfer shares to additional holders before a liquidity event can significantly multiply their total excluded gain. This is commonly called QSBS stacking.

There are three primary approaches:

1. Gifts to Family Members

When you gift QSBS shares to a child, parent, or other non-spouse family member, that person becomes a separate taxpayer with their own exclusion cap. A gift to your spouse, however, generally does not create a second cap. Spouses filing jointly are effectively treated as sharing one combined per-issuer limit, and while some practitioners argue separately-owned QSBS supports two caps, the conservative (and our recommended) position is one. Under Section 1202(h), the recipient generally tacks onto the donor’s holding period, meaning the clock doesn’t restart.

2. Non-Grantor Trusts

Each properly structured non-grantor trust is treated as a separate taxpayer for Section 1202 purposes. Transferring QSBS to a non-grantor trust, whether for estate planning, a generation-skipping arrangement, or state tax mitigation, creates an additional exclusion cap alongside your own.

One critical distinction: this only works with non-grantor trusts. A grantor trust (including most standard revocable trusts and many irrevocable trusts with retained powers) is disregarded for income tax purposes under Revenue Ruling 85-13. You remain the tax owner, and no additional exclusion cap is created. Notably, a standard Spousal Lifetime Access Trust (SLAT) is typically a grantor trust and won’t work for stacking without deliberate non-grantor drafting. Whether a trust is grantor or non-grantor turns on the technical rules of Sections 671–679, and this determination should be made by experienced counsel, not assumed.

3. Multiple Trusts

Founders can establish more than one non-grantor trust, each holding separate shares and each potentially qualifying for its own exclusion. But this is where the rules get sharpest. Under Section 643(f), the IRS can aggregate multiple trusts and treat them as one taxpayer if they have substantially the same grantors, substantially the same primary beneficiaries, and a principal purpose of tax avoidance. Best practice is one trust per distinct beneficiary (or beneficiary class), with materially different terms and documented non-tax purposes, not five near-identical trusts created the same day. Treasury officials signaled in mid-2026 that anti-stacking guidance is forthcoming, so this strategy demands careful structuring and current counsel.

A Real-World Stacking Scenario

Take a founder who receives stock issued after July 4, 2025, and eventually sells with $50 million in QSBS gains after a five-year-plus holding period (the 100% exclusion tier).

Without stacking (one holder):

• Exclusion cap: $15 million
• Gain excluded: $15 million
• Remaining taxable gain: $35 million
• Federal tax on $35M at 23.8%: approximately $8.33 million

With three qualifying holders (founder + trust + family gift):

• Total exclusion capacity: $45 million
• Gain excluded: $45 million
• Remaining taxable gain: $5 million
• Federal tax on $5M at 23.8%: approximately $1.19 million

Federal tax estimates assume a 23.8% rate (20% LTCG + 3.8% NIIT) on gain above the QSBS exclusion cap. State taxes vary by jurisdiction and are excluded from this illustration.

That’s a difference of roughly $7.14 million in federal taxes on the same exit, from the same company, with the same QSBS stock. The only variable is how many qualified taxpayers held it at the time of sale.

What Can Disqualify the Transfer Strategy

The per-taxpayer structure offers real planning opportunities, but the rules around transfers are strict. Getting this wrong doesn’t just cost you the strategy; it can expose the transferred shares to full taxation.

Timing is the most critical factor. Transfers made after a definitive agreement is signed, after an LOI becomes binding, or after a sale is substantially certain face a high risk of challenge under the assignment of income doctrine, and courts have sided with the IRS on transfers made when the gain was already effectively locked in. In Hoensheid v. Commissioner (T.C. Memo. 2023-34), a transfer made two days before closing was disallowed. There is no bright-line safe harbor. The test is facts and circumstances. Many practitioners treat 12–24 months of runway before LOI or exclusivity as a conservative heuristic, but it is a heuristic, not law. Transfers made while the stock’s value is still low also minimize gift tax impact.

Additional requirements to confirm:

• QSBS must have been acquired at original issuance directly from the corporation. Secondary market purchases don’t qualify, though gifts and other §1202(h) carryover transfers preserve QSBS status
• The issuing company’s aggregate gross assets must not have exceeded the applicable threshold at any time before and immediately after the issuance: $50 million for stock issued on or before July 4, 2025; $75 million (indexed from 2027) for stock issued after. The test uses cash plus the adjusted tax basis of assets (fair market value for contributed property), not GAAP book value or enterprise value. A company valued at $500 million can still pass. Notably, a company that previously crossed the $50 million line may again issue QSBS after July 4, 2025, until it reaches $75 million.
• The company must be a domestic C-corporation operating in a qualifying business

The 10x Basis Alternative: When It Beats the Dollar Cap

The per-taxpayer cap is always the greater of the dollar limit or 10 times the taxpayer’s aggregate adjusted basis in the QSBS sold. For most founders, adjusted basis in founder shares is nominal, making the dollar limit the controlling figure.

But for founders who contributed significant property, intellectual property, or cash to their companies at formation, the 10x calculation can substantially exceed the $15 million standard cap. A founder who contributed $2 million in assets, for example, could potentially exclude up to $20 million in gains from that position. One caveat: when appreciated property is contributed, the built-in gain that existed at contribution is generally not eligible for exclusion. The 10x cap enhancement applies to appreciation after the stock is issued.

This alternative applies per taxpayer, just like the dollar cap. When shares are gifted or transferred, the recipient generally carries over the donor’s adjusted basis, which means the 10x calculation follows the shares to each new holder.

The Window to Plan Is Open, But Not Forever

Understanding the QSBS per-taxpayer exclusion limit is step one. Acting on it requires time.

The strategies that take full advantage, including gifts to family members, trust structures, and multi-holder arrangements, require years of lead time to be defensible. Founders who engage in this planning while their company is still growing have the most flexibility. Founders who start the conversation after an LOI has been signed have almost none.

Two related considerations: First, the exclusion is federal: California, Pennsylvania, Alabama, Mississippi, and (newly, for 2026) Oregon don’t conform to Section 1202, so state tax may still apply regardless of ownership structure. (New Jersey now conforms for tax years beginning in 2026.) Second, for gain above your exclusion capacity, a Section 1045 rollover (available after a 6-month holding period, with replacement QSBS purchased within 60 days) can defer gain and continue the holding-period clock. Note that rolling pre-OBBBA stock does not upgrade it to the $15 million cap.

If you’re a venture-backed founder with qualifying QSBS and a potential liquidity event on the horizon, connect with our founder to discuss how the per-taxpayer structure applies to your specific situation.

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Sources

• 26 U.S. Code § 1202: Partial exclusion for gain from certain small business stock, Cornell Law School Legal Information Institute.
• “Significant Changes by the One Big Beautiful Bill Act to the Qualified Small Business Stock Provisions of Section 1202”, Perkins Coie, July 10, 2025.
• “‘Big Beautiful’ Expansions to Qualified Small Business Stock Gain Exclusion”, Stradley Ronon, August 5, 2025.
• “Qualified Small Business Stock (QSBS) Regime Expanded Under One Big Beautiful Bill Act”, Greenberg Traurig, July 2025.
• “Changes to Section 1202, Qualified Small Business Stock, in the One Big Beautiful Bill Act”, Baker Tilly.
• “Final Tax Reconciliation Bill Expands Small Business Stock Exclusion Under IRC Section 1202”, Ernst & Young (EY Tax News), July 2025.
• “Tax Planning Under IRC § 1202 With Trusts and ‘Stacking’ Strategies”, Boland Law Group, July 2025.
• “Quantifying the 100% Exclusion of Capital Gains on Small Business Stock”, U.S. Department of the Treasury.