Most founders think of the Section 1202 exclusion as a "$10 million rule" — or now, after the OBBBA, a "$15 million rule." That framing is misleading. The statute doesn't cap the exclusion at a fixed dollar amount. It caps it at the greater of $15 million or 10 times the taxpayer's adjusted basis in the stock. And for founders who contribute valuable assets to their company at incorporation — intellectual property, proprietary technology, data, or other property — that 10x basis cap can be orders of magnitude larger than $15 million.
Run the math: a founder who contributes IP with a fair market value of $75 million to a C-corp on or after July 4, 2025 (when the OBBBA's $75 million gross-asset ceiling kicks in) receives $75 million of adjusted basis in her QSBS. Her Section 1202 exclusion cap — from the 10x-basis alternative alone — is $750 million. That's not a typo. And it's not a loophole. It's exactly what Section 1202(b)(1)(B) says. (Pre-OBBBA, the same play caps out at $500 million.)
This post explains how the 10x basis cap works, what adjusted basis means for Section 1202 purposes, how trust stacking can multiply this further, and what founders need to do — and not do — to capture it.
One filter before you keep reading. The 10x basis cap only matters if you contributed actual property — IP, code, datasets, equipment, cash — to your C-corp at formation in exchange for stock. If you took founders stock for services (the typical sweat-equity grant), your basis is near zero and the $15M dollar cap is what binds you. This post is for the small subset of founders who walked in with something of independently appraisable value and exchanged it for shares.
01 — The Two-Part Cap: How Section 1202(b)(1) Actually Works
Section 1202(b)(1) limits the eligible gain exclusion per taxpayer per issuer to the greater of:
- $15 million (for stock acquired after July 4, 2025, under the OBBBA; $10 million for pre-OBBBA stock), or
- 10 times the taxpayer's adjusted basis in the stock as of the date of sale, determined without regard to any additions to basis after the date of issuance.
The dollar cap and the basis cap are alternatives. Whichever is larger controls. For the vast majority of founders — those who incorporated and took stock for nominal consideration — the $15 million cap is the binding constraint. But for founders who contributed property with genuine fair market value, the basis cap can vastly exceed the dollar cap.
02 — What Is "Adjusted Basis" for Section 1202 Purposes?
This is where many advisors get confused. For purposes of the 10x cap in Section 1202(b)(1)(B), "adjusted basis" means your basis in the QSBS stock as of the date of original issuance — and the statute expressly provides that it is "determined without regard to any addition to basis after the date on which such stock was originally issued." Additions to basis after issuance simply don't count.
For stock received in exchange for cash, basis equals the cash paid. For stock received in exchange for property in a Section 351 exchange, Section 1202(i)(1) controls: it provides that basis "shall in no event be less than the fair market value of the property exchanged." So if you contribute IP worth $75 million at formation, your basis in the QSBS is at least $75 million — and the 10x cap is at least $750 million.
One important clarification on citation: Section 1202(b)(2) defines "eligible gain" (gain from stock held at least three years), not "adjusted basis." The basis floor for contributed property comes from Section 1202(i)(1). The rule excluding post-issuance additions to basis comes from the last sentence of Section 1202(b)(1) itself.
A subtle but important point for the gross asset test: Section 1202(d)(2)(B) provides that, solely for purposes of the $75 million gross asset cap, contributed property is treated as having a basis equal to its fair market value at the time of contribution. This prevents founders from using a carryover-basis trick to stuff high-FMV property into a corporation while claiming the gross asset test is satisfied by reference to a low transferred basis. The 10x basis cap for exclusion purposes still works off the §1202(i)(1) FMV-floor basis — but the gross asset test does too. So an IP contribution worth $76 million blows the QSBS qualification entirely, no matter how the basis is otherwise computed.
Services do not establish basis for the 10x cap. A founder who contributes sweat equity — time, expertise, future labor — receives stock with a basis equal to the compensation income recognized, which in a typical founders' grant is near zero. Only contributions of property establish the kind of basis that makes the 10x cap meaningful.
03 — The $750 Million Scenario: Walking Through the Math
Here's how you get to $750 million in federal tax-free gain from a single company:
Step 1: Contribute high-value assets at incorporation. A founder holds proprietary AI technology she developed independently — algorithms, training data, and associated IP — with a fair market value of $75 million. She incorporates a Delaware C corporation and contributes the IP in exchange for founder shares. The corporation issues QSBS to her.
Her adjusted basis in the QSBS: $75 million (under Section 1202(i)(1), basis is at least the FMV of property contributed at exchange). Her Section 1202(b)(1)(B) cap: 10 × $75 million = $750 million.
Step 2: Ensure the active business requirement is satisfied. The corporation must use the contributed assets in an active qualified trade or business — not park them. The active business test requires that at least 80% of the corporation's assets be used in qualified active business. A technology company actively developing and commercializing the contributed IP generally satisfies this requirement, but it must be maintained throughout substantially all of the holding period.
Step 3: Hold for five years. The founder must hold the QSBS for more than five years. The five-year clock runs from the date of original issuance.
Step 4: Verify the gross asset test at issuance. At the time the founder receives the QSBS, the corporation's aggregate gross assets (cash plus FMV of property contributed) must not exceed $75 million under the OBBBA rules (increased from the prior $50 million limit). If the contributed IP is worth $75 million and the corporation has no other assets, this is right at the limit. Timing and structuring matter here — getting a qualified valuation before issuance is essential.
If all four conditions are met — and assuming post-OBBBA stock (issued after July 4, 2025) held for more than five years, with every other §1202 requirement satisfied — the entire $750 million in gain is excluded from federal income tax under Section 1202. For stock held three or four years post-OBBBA, partial exclusions apply (50% at three years, 75% at four years). For pre-OBBBA stock, the holding period requirement is still five years, and the gross-asset ceiling was $50 million, capping the comparable basis play at $500 million.
04 — Trust Stacking on Top of the 10x Basis Cap
Now layer in trust stacking (covered in depth in my companion post, QSBS Stacking: How to Multiply the $15M Exclusion with Trusts and Family Gifts). The $750 million exclusion above applies to a single taxpayer. But the founder can transfer shares of QSBS to multiple irrevocable non-grantor trusts before a liquidity event. Each non-grantor trust is a separate taxpayer with its own Section 1202 exclusion.
Critically, for gifted QSBS, the trust takes a carryover basis under Section 1015. If the founder gifts shares with $25 million of basis to each of three trusts, and retains shares with $25 million of basis herself:
- Founder: 10 × $25M basis = $250M exclusion cap
- Trust #1: 10 × $25M basis = $250M exclusion cap
- Trust #2: 10 × $25M basis = $250M exclusion cap
- Trust #3: 10 × $25M basis = $250M exclusion cap
Total potential exclusion: $1 billion.
This is not a manufactured deduction — it follows from §1202's per-taxpayer cap, the carryover-basis rules for gifted QSBS (Section 1202(h)(2)(A) and Section 1015), and the general non-grantor trust taxpayer rules. But multi-trust planning remains an area where anti-abuse doctrines and future Treasury guidance matter. The structure still requires real economics, early planning, independent trustees, and defensible non-tax purposes. Early transfers at genuinely modest values hold up far better on audit than last-minute moves near a known exit.
05 — The Gross Asset Cap: The Binding Constraint
There is one critical constraint that limits the size of the 10x basis play: the gross asset test.
At the time of QSBS issuance, the corporation's aggregate gross assets must not exceed $75 million (under the OBBBA; $50 million under prior law). This is measured as cash plus the aggregate adjusted bases of property contributed to the corporation.
If a founder contributes IP worth $75 million, the corporation's gross assets are $75 million at the moment of issuance — right at the limit. That gives a 10x basis cap of $750 million on a single taxpayer's interest.
If the contributed IP is worth more than $75 million, the gross asset test fails, and the stock is not QSBS at all. There is no exclusion.
This means the maximum single-taxpayer 10x basis exclusion for OBBBA-era stock is $750 million (10 × $75 million gross asset limit). Before the OBBBA, with the $50 million gross asset test, the maximum was $500 million (10 × $50 million).
The dollar cap ($15 million) is irrelevant when the 10x basis cap controls. The only binding constraint is whether the corporation satisfies the gross asset test — and whether the contributed assets actually have the asserted fair market value, which requires a credible, defensible appraisal.
06 — Valuation Is Everything
The 10x basis play lives or dies on valuation. If your IP is actually worth $75 million at the time of contribution, you have $750 million in potential exclusion per taxpayer. If it's worth $5 million, you have $50 million.
The IRS will scrutinize both the valuation of contributed assets and the gross asset calculation. A few key points:
Get a qualified appraisal at issuance. For non-cash contributions, a credible independent valuation establishes the adjusted basis and demonstrates that the gross asset test was satisfied. Without one, both the basis cap and QSBS status itself are vulnerable.
Valuation date matters. The FMV of contributed assets is determined at the time of exchange — not at a later date. IP valuation at formation, before the company has generated revenue or proven market demand, is typically lower than post-funding valuations. This cuts both ways: lower FMV means lower basis, but it also makes the gross asset test easier to satisfy.
Defensible FMV. Whatever methodology the appraiser uses, the IRS will test the result against what an arm's-length buyer would pay. Overstating contributed-asset value is a serious tax risk, and where prior employer claims or other related-party considerations are in play, the appraisal needs to address them head-on.
07 — What Qualifies as Contributed "Property"?
Not everything of value can establish basis for the 10x cap. Under Section 1202(i)(1), for stock received in exchange for property, basis is at least the fair market value of the property contributed at the time of the exchange. Under the last sentence of Section 1202(b)(1), any additions to basis after the original issuance date are disregarded entirely. The contribution must be of property — not services.
Items that can establish basis:
- Intellectual property (patents, trade secrets, copyrights, software, datasets)
- Licenses to IP
- Cash
- Equipment, hardware, prototypes
- Customer contracts or other contractual rights (carefully analyzed)
Items that cannot establish basis:
- Services (including founder sweat equity)
- Future commitments to perform services
- Goodwill attributable to personal reputation rather than transferred business assets
The distinction matters enormously. A software engineer who writes code and contributes her time to incorporation receives QSBS, but her basis is minimal — the Section 83(b) election value, which for founder shares is typically near zero. A founder who contributes a working AI model with genuine market value has a very different basis position.
08 — Practical Implications: Who This Actually Helps
The $750 million tax-free scenario is not hypothetical, but it requires a specific factual pattern:
Serial IP developers and researchers. Academic researchers, serial entrepreneurs, and independent inventors who develop intellectual property before incorporation — and can credibly document its fair market value — are the primary beneficiaries of the 10x basis cap.
Technology spinouts. When a founder licenses or contributes technology developed independently (outside of employment obligations) to a new C corporation, the contributed IP can establish substantial basis. Compliance with IP assignment agreements and employment restrictions is essential.
AI and data companies. Proprietary training datasets, fine-tuned models, and specialized AI systems can have significant fair market value. A founder who contributes a trained model valued at $50–75 million to a new C corporation at formation could establish a 10x basis cap of $500–750 million — subject to a credible valuation and compliance with the gross asset test.
Biotech and pharma founders. Drug discovery compounds, proprietary assays, and preclinical data packages often have substantial pre-commercial value that can be documented through technology valuation methodologies.
09 — What Good Planning Looks Like
A founder who captures these benefits has typically done the following before incorporation:
- Documented and secured the IP. All IP is clearly documented, not subject to prior employer claims, and assigned to the founder (not the corporation yet) prior to formation.
- Obtained a qualified appraisal. An independent valuation firm has appraised the IP as of the contribution date. The methodology is documented and defensible against an arm's-length-buyer standard.
- Structured the contribution correctly. The founder contributed the IP to the corporation under Section 351 (if applicable) in exchange for QSBS, and the transaction was reported consistently on the applicable tax filings.
- Confirmed the gross asset ceiling. The aggregate gross assets of the corporation at issuance — including the contributed IP — do not exceed $75 million (or $50 million for pre-OBBBA stock).
- Set up non-grantor trusts early. With the contribution establishing substantial basis per share, the founder transferred shares to irrevocable non-grantor trusts when the stock was worth modest amounts, distributing carryover basis across multiple taxpayers.
- Maintained the active business test. The corporation used the contributed IP in its active qualified trade or business throughout substantially all of the holding period.
Done correctly, this isn't aggressive tax planning — it's the factual scenario the 10x-basis alternative cap was written to accommodate. Done sloppily, it's exposure.
10 — The Risks and What the IRS Can Challenge
Nothing about Section 1202's 10x basis cap is ambiguous in the statute. But several pieces of the planning are vulnerable:
IP valuation. The IRS can and does challenge valuations of contributed property. An inflated appraisal that overstates the value of contributed IP is the primary risk. The consequences include loss of QSBS status entirely (if the gross asset test was actually exceeded) or a reduced basis cap (if the valuation is adjusted downward).
Gross asset test accuracy. If the aggregate gross assets exceeded $75 million at issuance, the stock is not QSBS. There's no cure. Getting this right at issuance — with documentation — is critical.
Active business test maintenance. If the corporation fails the active business test at any point during "substantially all" of the holding period, Section 1202 exclusion fails for that period. Companies that pivot away from their active business, accumulate excess passive assets, or hold significant non-qualified financial assets are at risk.
Trust stacking challenges. As discussed in my companion post on trust stacking, the IRS has general anti-abuse doctrines that could theoretically challenge trust-based stacking — and Treasury has signaled it is looking at this area. Early transfers at low values, with genuine estate planning purposes and independent trust administration, are far more defensible than last-minute transfers near a known exit.
Arm's-length valuation. Contributed IP that is overvalued relative to what an arm's-length buyer would pay is vulnerable on audit. The appraisal needs to be rigorous and supportable.
11 — Bottom Line
The $750 million federal tax-free gain from a single company isn't a loophole — but it isn't automatic either. It follows from §1202's 10x-basis alternative cap, the per-taxpayer structure, the carryover-basis rules for gifted QSBS, and the non-grantor trust taxpayer rules. For founders who contribute substantial, independently-valued intellectual property to a new C corporation at formation on or after July 4, 2025, and who hold their QSBS for more than five years through a compliant active business, this is what the statute makes available. (Pre-OBBBA, the comparable basis play caps at $500 million off the $50M gross-asset ceiling.) The result still depends on real economics, defensible appraisals, and clean planning at formation.
The constraints are real: the gross asset ceiling limits single-taxpayer basis to $75 million (and therefore the exclusion to $750 million), and trust stacking requires careful, early planning. But for founders in the right factual situation, the numbers can be extraordinary.
If you're at the formation stage and you have IP or other property with genuine value to contribute, the time to plan this is before you issue stock — not after. The basis is established at issuance and locked in. There is no going back.
This post is for informational purposes only and does not constitute legal or tax advice. The tax consequences of contributing property to a corporation and claiming the Section 1202 exclusion depend on specific facts and circumstances. Consult qualified legal and tax advisors before taking any action.
Ready to Plan Before You Incorporate?
If you have IP or other assets you're thinking about contributing to a new C corporation, the basis-setting decision happens at formation — and it has eight-figure consequences once you sign the incorporation documents. A fixed-fee QSBS Issue-Spotting Review maps out your QSBS position, the 10x basis math, and the trust structure needed to maximize what you keep — before you lock in the wrong basis.
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