QSBS and Section 1202: How Startup Founders Can Exclude Up to $10M in Capital Gains

Section 1202 of the Internal Revenue Code allows holders of Qualified Small Business Stock (QSBS) to exclude up to $15 million — or 10x their cost basis, whichever is greater — in capital gains from federal income tax (for stock acquired after July 4, 2025; $10M for stock acquired earlier). For startup founders and early employees, this can mean paying zero federal tax on millions of dollars in exit proceeds.

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How QSBS Works

When you sell stock that qualifies as QSBS and meet the 5-year holding period, you can exclude the gain from your federal taxable income entirely. At a 20% long-term capital gains rate (plus 3.8% net investment income tax), this exclusion is worth up to $3.57M in federal tax savings on a $15M gain. Even a partial exclusion at 3 or 4 years provides significant savings.

The exclusion applies per taxpayer per company. If two co-founders each hold QSBS, they each get a separate $15M exclusion — that's $30M in tax-free gains between them.

2025 Update: The One Big Beautiful Bill Act (OBBBA)

The QSBS landscape changed significantly on July 4, 2025, when President Trump signed the One Big Beautiful Bill Act into law. The OBBBA dramatically expanded Section 1202 benefits for stock acquired after the enactment date. Here's what changed:

Phased Exclusion Starting at 3 Years (Down from 5)

Under prior law, you needed to hold QSBS for more than 5 years to get any exclusion. The OBBBA introduces a tiered system for stock acquired after July 4, 2025:

Holding Period	Gain Exclusion
3 years	50%
4 years	75%
5+ years	100%

This is a major shift. Founders and early employees who need liquidity before the 5-year mark can now exit after 3 years and still exclude half their gain. The effective tax rate on the taxable portion is 28% (not the standard 20% capital gains rate), so a 50% exclusion results in a ~14% effective rate, and a 75% exclusion results in ~7%.

For stock acquired on or before July 4, 2025, the old rules still apply: 100% exclusion requires holding for more than 5 years (for stock acquired after September 27, 2010).

Exclusion Cap Raised to $15M

The per-issuer gain exclusion cap increased from $10M to $15M (or 10x basis, whichever is greater) for stock acquired after July 4, 2025. The $15M cap is adjusted for inflation beginning in 2027. For married taxpayers filing separately, the cap is $7.5M.

Stock acquired on or before July 4, 2025 retains the $10M cap. Coordinating rules prevent double-dipping across old and new caps for the same issuer.

Gross Assets Threshold Raised to $75M

The aggregate gross assets limit — the maximum a company can hold and still issue QSBS — increased from $50M to $75M, with inflation adjustments starting in 2027. This expands eligibility to more mature startups, particularly in tech and life sciences where early funding rounds can be large.

What This Means for Planning

• New stock issuances after July 4, 2025 automatically qualify under the enhanced rules — higher cap, lower holding period, higher asset threshold.
• Convertible note conversions after July 4, 2025 should qualify for the new rules even if the note was signed earlier.
• Existing stock issued before July 4, 2025 stays under the old rules. You can't "refresh" old stock into new QSBS by re-issuing or exchanging it — the IRS will treat it as a continuation.
• Stock splits and dividends don't change QSBS eligibility dates.
• Tax-free reorganizations generally result in tacking of the holding period, meaning you don't get post-July 4, 2025 treatment.

The OBBBA makes QSBS even more founder- and investor-friendly. But the core requirements haven't changed — you still need to meet all five to qualify.

The Five Requirements

To qualify for the QSBS exclusion, all five conditions must be met:

1. C-Corporation

The stock must be issued by a domestic C-Corporation. LLCs, S-Corps, and partnerships do not qualify. This is one of many reasons venture-backed startups incorporate as Delaware C-Corps.

2. Original Issuance

You must acquire the stock directly from the company — either by purchase (founder stock) or through the exercise of options or warrants. Stock purchased on the secondary market from another shareholder does not qualify.

Important: Stock received through option exercise qualifies, but the QSBS holding period starts on the exercise date, not the grant date. This is why early exercise combined with an 83(b) election can be strategically valuable — it starts both the QSBS clock and the long-term capital gains clock earlier.

3. Active Business Requirement

At least 80% of the company's assets must be used in the active conduct of a qualified trade or business. Most technology companies easily meet this requirement.

Excluded businesses: Professional services (law, accounting, consulting, engineering), banking, insurance, farming, mining, and hospitality. If you're building a SaaS product, fintech platform, or healthtech solution, you almost certainly qualify.

4. $50M Gross Assets Test

The company's aggregate gross assets must not exceed $75M at the time of stock issuance and immediately after (increased from $50M by the OBBBA, with inflation adjustments starting in 2027). For stock issued before July 4, 2025, the $50M threshold applies. Gross assets are measured by the tax basis of the company's assets (cash contributed plus the adjusted basis of other assets), not fair market value.

The higher $75M threshold expands eligibility to more mature startups, particularly in tech and life sciences where funding rounds can push gross assets above the old $50M limit.

5. Holding Period

For stock acquired after July 4, 2025, you can benefit from a partial exclusion starting at 3 years (50%), increasing to 75% at 4 years, and 100% at 5+ years. For stock acquired before that date, the full 5-year holding period is required for the 100% exclusion.

If you sell before meeting the minimum holding period but after six months, you may still benefit through a Section 1045 rollover — reinvesting the proceeds into another QSBS within 60 days to defer the gain.

Maximizing the QSBS Exclusion

Start the Clock Early

The five-year holding period is the binding constraint for most founders. Starting it as early as possible is critical:

• File an 83(b) election on restricted founder stock. This starts the holding period at purchase, not at vesting.
• Consider early exercise of stock options if your company allows it. Exercising before the stock has appreciated keeps the cost low and starts the clock.

Stack Exclusions Across Shareholders

Each taxpayer gets their own $15M exclusion (for post-July 4, 2025 stock). Strategies to maximize total tax-free proceeds include:

• Gifting QSBS to family members before sale. Each recipient gets their own exclusion. (Gift tax rules apply; consult a tax advisor.)
• Contributing QSBS to trusts. Certain trusts may each qualify for a separate exclusion.
• Married couples filing jointly each get a $15M exclusion if they each hold qualifying stock.

The 10x Basis Alternative

The exclusion is the greater of $15M (or $10M for pre-July 4, 2025 stock) or 10x your cost basis. If your cost basis is $2M (because you invested $2M for your shares through exercise or purchase), your exclusion is $20M, not $15M.

This creates a scenario where early employees who exercise options at higher strike prices may actually have a larger exclusion than founders who purchased stock at $0.001/share.

State Tax Considerations

The QSBS exclusion is a federal benefit. State treatment varies significantly:

State	QSBS Treatment
California	Does NOT conform — full state tax applies
New York	Does NOT conform
Colorado	Conforms — exclusion applies at state level
Texas	No state income tax
Florida	No state income tax
Most other states	Varies — check your state

California's non-conformity is particularly painful for Bay Area founders. A $10M gain excluded from federal tax is still subject to California's 13.3% top rate, resulting in a $1.33M state tax bill.

Common QSBS Mistakes

Not Tracking Qualification from Day One

QSBS qualification should be assessed at the time of stock issuance, not at exit. If the company exceeds the $50M gross assets threshold before all stock is issued, later shares may not qualify.

Converting from LLC to C-Corp

If your company started as an LLC and converted to a C-Corp, the QSBS clock starts at conversion — not at original LLC formation. This is another reason to start as a C-Corp from day one.

Missing the 83(b) Election

Without an 83(b), the QSBS holding period for restricted stock starts at each vesting date, not at purchase. Shares that vest in year three of a four-year schedule may not hit the five-year mark before an exit.

Assuming All Shares Qualify

Different stock issuances may have different qualification dates and status. Stock issued when the company had $30M in gross assets qualifies. Stock issued after a $60M Series C may not.

The Bottom Line

QSBS is one of the most powerful tax benefits available to startup founders and early employees. With the OBBBA's expansion — a $15M exclusion cap, partial exclusions starting at 3 years, and a $75M gross assets threshold — the benefit is more accessible and more valuable than ever.

The key actions:

1. Incorporate as a Delaware C-Corp
2. File 83(b) elections immediately upon purchasing restricted stock
3. Monitor the $75M gross assets threshold (or $50M for pre-July 4, 2025 stock)
4. Track the holding period for each stock issuance — partial exclusions now available at 3 and 4 years
5. For new issuances, consider timing stock grants after July 4, 2025 to benefit from the enhanced rules
6. Consult a tax advisor before any liquidity event to maximize the benefit

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