Qualified Small Business Stock Tax Exclusion: Understanding Section 1202 Benefits

The Qualified Small Business Stock (QSBS) tax exclusion under Section 1202 represents one of the most valuable tax benefits available to startup founders and early-stage investors. Understanding how this exclusion works, including eligibility requirements, exclusion percentages, and potential capital gains savings, can mean the difference between paying millions in federal taxes or keeping those funds to grow your wealth.

With the One Big Beautiful Bill Act (OBBBA) signed into law on July 4, 2025, QSBS benefits have expanded significantly, creating new opportunities for founders to reduce or eliminate capital gains taxes on successful exits.

Section 1202 allows eligible taxpayers to exclude a portion (or all) of capital gains from federal taxation when selling qualified small business stock. The percentage excluded depends on when you acquired the stock and how long you held it.

What “Exclusion” Means

When you claim a QSBS exclusion, the excluded portion of your gain is removed from your taxable income calculation. This means:

• 100% exclusion = $0 federal capital gains tax
• 75% exclusion = You pay tax on only 25% of your gain
• 50% exclusion = You pay tax on only 50% of your gain

These percentages apply to your eligible gain up to the per-issuer cap (see below). Gain above the cap is taxed as regular long-term capital gain at up to 23.8% including the net investment income tax.

The excluded amount never appears on your taxable income, delivering direct dollar-for-dollar tax savings.

How Much Gain Can You Exclude? The Per-Issuer Cap

The exclusion is not unlimited. Each taxpayer can exclude eligible gain from any single company up to the greater of a flat dollar cap ($10 million for stock acquired on or before July 4, 2025; $15 million for stock acquired after that date, indexed for inflation beginning in 2027) or 10 times the adjusted basis of the stock sold during the year.

The cap is cumulative across years for the same issuer, and the pre- and post-OBBBA amounts are coordinated, so you do not get $10 million plus a fresh $15 million from the same company. Gain above the cap is taxed as regular long-term capital gain at up to 23.8% including the net investment income tax.

The One Big Beautiful Bill Act, signed July 4, 2025, represents the most significant expansion of QSBS benefits since Section 1202 was created in 1993.

Key Changes for Stock Issued After July 4, 2025:

1. Shortened Holding Periods

Previously, you needed more than 5 years to see ANY QSBS benefit. Now, partial benefits begin at 3 years:

2. Increased Exclusion Caps

Note that OBBBA uses two different triggers: the $15M cap and the tiered holding periods follow the stock’s acquisition date, while the $75M gross asset threshold follows the stock’s issuance date. For stock issued directly to a founder these usually coincide, but for gifted or rolled-over stock the tacked acquisition date controls which cap and tiers apply.

Important: The per-issuer cap applies per taxpayer, not per household. Spouses filing a joint return are generally treated as a single taxpayer for this purpose and don’t each receive a separate cap simply by being married. Increasing total excludable gain requires additional separate taxpayers, such as a properly structured non-grantor trust, not joint filing status.

The new $15M cap is indexed for inflation beginning in 2027.

3. Higher Asset Threshold

This allows later-stage startups to continue issuing QSBS-eligible equity longer into their growth trajectory.

With the OBBBA framework in mind, here is exactly what you can exclude based on when you acquired your stock and how long you hold it.

Pre-OBBBA Stock (Acquired on or Before July 4, 2025)

If you acquired your stock before July 5, 2025, the original Section 1202 rules apply:

For 50% and 75% stock, the taxable portion is taxed at a maximum 28% federal rate plus 3.8% NIIT (31.8% combined), producing effective rates of roughly 15.9% and 7.95% on the total gain. In addition, 7% of the excluded gain on legacy 50% and 75% stock is an AMT preference item, which can raise the effective rate slightly for AMT taxpayers. The 100% exclusion carries no AMT preference.

Post-OBBBA Stock (Acquired After July 4, 2025)

The new tiered system rewards longer holding periods with increasing exclusion percentages:

These tiers apply only to stock acquired after July 4, 2025, so the first 3-year exits under the new rules arrive in July 2028 and the first 5-year exits in July 2030. Rates assume a top-bracket taxpayer; the non-excluded portion under the 50% and 75% tiers is taxed at a maximum 28% federal rate plus 3.8% NIIT. Stock held one year or less is short-term gain taxed at ordinary rates.

Key Insight: Founders who hold for 5 years realize $159,000 more in tax savings per million dollars of gain compared to those who exit after 3 years.

Meeting QSBS requirements involves satisfying tests at both the corporate and shareholder levels. Your company must qualify to issue QSBS, and you, as a shareholder, must meet separate requirements to claim the exclusion.

Company-Level Requirements

Your company must be a domestic C corporation and pass the gross assets test when your stock is issued. Two requirements continue after issuance: the company must remain a C corporation and must satisfy the 80% active business test for substantially all of your holding period, not just on day one.

*Indexed for inflation starting 2027

Aggregate gross assets means cash plus the adjusted tax basis of other property (not GAAP value), except property contributed to the corporation counts at its fair market value at contribution. The company must have stayed at or under the threshold at all times before your issuance and immediately after it, counting the new money raised. A single moment above the threshold permanently disqualifies stock issued after that point, though stock that already qualified is not retroactively tainted if the company later grows past the threshold.

Active Business Test: 80% Asset Use Requirement

Throughout substantially all of your holding period, at least 80% of the company’s assets (by value) must be used in the active conduct of one or more qualified trades or businesses (Section 1202(e)(1)).

Assets that count toward 80%:

• Operating assets actively used in business operations
• Equipment, inventory, and facilities used in qualified business activities
• Reasonably required working capital for qualified business needs
• Assets held for investment that are reasonably expected to be used within 2 years to finance research and experimentation or working capital needs
• Rights to computer software that produces active business computer software royalties

Separate failure tests (each has its own denominator):

• Portfolio stock or securities in non-subsidiary corporations: the test fails if more than 10% of the value of assets in excess of liabilities consists of such holdings (Section 1202(e)(5)(B))
• Real property not used in the active business: the test fails if more than 10% of the total value of assets is such property (Section 1202(e)(7))

Important Limitation: Once the corporation has been in existence for at least 2 years, no more than 50% of its assets can count as active-business assets under the working capital safe harbor (Section 1202(e)(6)). The 2-year expected-use rule and the 50% ceiling are two different limits: the first decides whether cash held for future R&D or working capital counts at all; the second caps how much can qualify through that safe harbor once the company is past its second year.

Disqualified Business Types

Your company cannot be primarily engaged in:

These exclusions turn on what the business actually does, not its label. The IRS has ruled specific businesses in health and data services qualified on their facts in private letter rulings, so a company that touches an excluded field should get a specific analysis rather than assume disqualification.

Shareholder-Level Requirements

Even if your company qualifies, you must meet three requirements to claim the exclusion:

The holding period clock does not always start when you think it does, and this is where founders most often get burned.

Founder stock: the clock starts when the corporation issues your shares.

Stock options: the clock starts at exercise, not grant. The grant date is irrelevant for QSBS. Just as important, the company must pass the gross assets test on your exercise date, so exercising late, after the company has grown past the threshold, can produce stock that never qualifies. Early exercise combined with an 83(b) election starts the clock sooner and locks in the gross assets test at a lower asset level.

Restricted stock: with a timely 83(b) election (due within 30 days of the transfer, no extensions), the clock starts at grant. Without it, each tranche starts when it vests.

Convertible notes and SAFEs: a convertible note is debt; the QSBS clock starts at conversion, and the gross assets test is measured at that date. SAFE treatment is unsettled: many practitioners treat post-money SAFEs as stock from the investment date, but the conservative position starts the clock at conversion. Document the position when you invest.

Gifts and inheritance: the recipient inherits the donor’s holding period and acquisition date.

Section 1045 rollovers: the holding period from the sold stock tacks onto the replacement stock.

Federal QSBS exclusion is powerful, but state treatment varies dramatically and can significantly impact your total tax bill.

State Conformity Overview

Washington has no general income tax but imposes a capital gains excise tax (7%, rising to 9.9% above $1M of taxable gains); federally excluded QSBS gain currently falls outside its base. A separate 9.9% income tax on income above $1M is enacted effective 2028, but faces a repeal measure (Initiative 645) on the November 3, 2026 ballot and a pending constitutional challenge, so confirm its status before planning around it.

California Example: Why State Treatment Matters

$10M QSBS gain (100% federal exclusion):

• Federal tax: $0 (fully excluded)
• California state tax: $1.33M (13.3% top rate, no QSBS exclusion)
• Total tax liability: $1.33M

Same gain in Florida (no state income tax):

• Federal tax: $0 (fully excluded)
• Florida state tax: $0 (no state income tax)
• Total tax liability: $0

Potential planning opportunity: Some founders establish residency in favorable states before triggering QSBS gains. Consult advisors on domicile planning timelines.

Beyond basic eligibility, strategic planning can significantly increase your tax savings.

QSBS Stacking

Gifting stock to additional taxpayers before a sale can multiply the exclusion, because each separate taxpayer gets its own per-issuer cap. There are two ways to create separate taxpayers: properly structured non-grantor trusts, and gifts to other individuals such as adult children, parents, or siblings, each of whom claims their own cap on the gifted shares. Grantor trusts do not work for this purpose; their gains are taxed back to the grantor. And a spouse is the one family member who generally does not add a cap: spouses filing a joint return are treated as a single taxpayer for the per-issuer limit.

Example: instead of one $15M cap on post-OBBBA stock, a founder could access:

• Your cap: $15M
• Non-grantor trust 1: $15M
• Non-grantor trust 2: $15M
• Gift to an adult child: $15M
• Total potential exclusion: $60M

Gifts to individuals are simpler than trusts but come with real tradeoffs: the recipient owns the shares outright and controls the proceeds, the gift uses lifetime gift and estate exemption based on the stock’s value at transfer, and the donee takes your basis and your acquisition date. That last point matters for everyone in the structure: gifting pre-OBBBA stock gives each trust or individual the $10M cap and the more-than-5-year holding requirement, not the new $15M cap and tiers.

Two more caveats:

First, gifts must be completed well before a sale becomes practically certain; transfers made on the eve of a signed deal can be attributed back to the donor under assignment of income principles (Hoensheid v. Commissioner, T.C. Memo. 2023-34).

Second, Treasury officials have publicly signaled that guidance limiting stacking is coming. The stated concern targets carbon copy trusts: multiple structurally identical trusts with the same terms, the same trustee, and the same beneficiaries, created only to multiply the cap. Defensible structures use distinct beneficiaries, independent trustees, different dispositive terms, and a documented estate planning purpose for each trust. Verify the status of that guidance before executing.

Section 1045 Rollovers

If you sell QSBS you have held for more than 6 months but have not yet reached your exclusion holding period, Section 1045 lets you defer the gain by reinvesting in new QSBS within the 60-day period beginning on the date of sale. Full deferral requires reinvesting the entire sale proceeds (the amount realized), not just the gain; reinvest less and gain is recognized to the extent of the shortfall.

The deferral is not automatic: you must make an affirmative Section 1045 election on a timely filed return for the year of sale. The sold stock’s holding period tacks onto the replacement stock and the deferred gain reduces the replacement stock’s basis, so this is a deferral, not a permanent exclusion.

One limit to understand: rolling over pre-OBBBA stock does not upgrade you to the post-OBBBA rules. The tacked holding period carries the original acquisition regime, meaning the $10 million cap and the more-than-5-year requirement continue to apply.

Timing Your Exit

Key Takeaways

The QSBS tax exclusion remains one of the most powerful wealth-building tools for startup founders. Recent OBBBA changes have made these benefits more accessible:

• Graduated exclusion percentages (50% at 3 years, 75% at 4 years, 100% at 5 years)
• Higher exclusion caps ($15M vs. $10M for post-July 2025 stock)
• Increased asset thresholds ($75M vs. $50M)
• Real tax savings ranging from $79,000 to $238,000 per $1M of gain

Understanding the exclusion percentages, eligibility requirements, and capital gains savings potential helps you make informed decisions about equity compensation, exit timing, and wealth preservation strategies.

Ready to Maximize Your QSBS Exclusion?

At Keystone Global Partners, we help founders understand and implement QSBS strategies tailored to their specific situations. Whether you’re 3 years from exit or negotiating a term sheet today, our team can help you structure your equity for maximum tax savings.