Qualified Small Business Stock (QSBS) — Section 1202 Gain Exclusion

If you buy stock in a qualifying startup and hold it for at least five years, you may be able to exclude 100% of the gain when you sell — completely tax-free at the federal level, with no dollar limit per company, as long as the gain doesn't exceed $10 million (or 10 times your adjusted basis in the stock, if that's higher). This is the Section 1202 exclusion for Qualified Small Business Stock (QSBS), one of the most powerful — and often overlooked — tax incentives in the Internal Revenue Code. Codified at 26 U.S.C. § 1202, it was enacted in 1993 to encourage investment in small C corporations, and Congress expanded it to a 100% exclusion in 2010, creating a potentially enormous after-tax benefit for early investors in startups that hit it big.

Current Law (2026)

Parameter	Value
Core statute	26 U.S.C. § 1202
Exclusion percentage	100% of gain for stock acquired after September 27, 2010 and held 5+ years
Dollar limit per corporation	Greater of $10 million or 10× adjusted basis in stock disposed of
Married filing separately	$5 million limit per spouse
Minimum holding period	5 years (3 years for partial exclusions before the 2010 expansion)
Corporate form requirement	Must be a domestic C corporation at time of issuance
Asset test	Aggregate gross assets of the corporation must not exceed $50 million at time of issuance and immediately after
Active business requirement	At least 80% of the corporation's assets must be used in qualified trades or businesses
Original issue requirement	Taxpayer must acquire the stock at original issuance (not from secondary market)
Consideration for stock	Stock must be acquired in exchange for money, property, or services
Ineligible businesses	Professional services (health, law, accounting, finance, brokerage, performing arts, consulting, athletics), hotels, restaurants, financial services, farming
Rollover provision	§ 1045 allows 60-day rollover into new QSBS without recognizing gain for stock held 6+ months
AMT/net investment income tax	For 100% exclusion (post-Sept. 2010 stock), gain is also excluded from AMT and net investment income tax

Legal Authority

26 U.S.C. § 1202(a) — Exclusion percentage: 100% exclusion for stock acquired after September 27, 2010 and held more than 5 years; prior exclusion percentages were 75% (2009-2010), 60% for empowerment zone businesses, and 50% for stock acquired before the 2009 expansion
26 U.S.C. § 1202(b) — Per-corporation gain limit: the exclusion is capped at the greater of $10 million or 10 times the taxpayer's adjusted basis in the stock sold; if you invested $2 million in a startup and it's worth $40 million, you could exclude up to $20 million (10× basis) — not just the $10 million floor
26 U.S.C. § 1202(c) — Qualified small business stock defined: stock in a domestic C corporation that meets the asset test, active business test, and original issuance requirement; the stock must be issued in exchange for money, property other than stock, or services — not as a result of conversion from another instrument (with some exceptions)
26 U.S.C. § 1202(d) — Asset threshold: at the time the taxpayer acquires the stock and immediately after issuance, the corporation's aggregate gross assets cannot exceed $50 million; post-issuance growth does not disqualify the stock — the test applies only at the moment of acquisition
26 U.S.C. § 1202(e) — Active business requirement: during substantially all of the holding period, at least 80% of the value of the corporation's assets must be used in the active conduct of one or more qualified trades or businesses; qualified businesses exclude professional service firms in health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage, as well as hotels, restaurants, and businesses where the principal asset is the reputation or skill of specific employees
26 U.S.C. § 1202(f) — Working capital: cash and assets held as working capital for use in a qualified business within 2 years counts toward the active business requirement, even though it isn't yet deployed in the business
26 U.S.C. § 1045 — Rollover of gain: a taxpayer may defer recognizing gain on QSBS held more than 6 months by rolling the proceeds into new QSBS within 60 days; this allows investors to redeploy capital into new startups without paying tax, though the holding period and basis carry over

What Qualifies

The corporation must be a C corporation: S corporations, LLCs, and partnerships do not qualify — even for a tax year in which the entity had S corporation status. Startups that begin as LLCs and convert to C corporations can potentially qualify after conversion, but only for stock issued after conversion (not for stock issued as LLC interests). This requirement is why "QSBS planning" often influences startup formation decisions toward the Delaware C corporation structure.

The $50 million asset cap at time of issuance: The corporation's gross assets (cash plus basis of other assets, with some adjustments) cannot exceed $50 million at the moment the taxpayer acquires the stock. This means QSBS eligibility is typically locked in at early funding rounds — seed rounds, Series A, sometimes Series B. By the time a startup has reached $50 million in assets, new investors are buying non-qualifying stock. Existing investors who acquired stock when assets were below $50 million retain their QSBS status even as the company grows beyond the threshold.

Original issuance — not secondary market purchases: The exclusion only applies to stock acquired directly from the corporation, not purchased from another investor on a secondary market or in a tender offer. If you buy startup shares from a departing founder, those shares likely don't qualify even if the corporation otherwise meets all tests. This rule strongly favors early investors who receive stock directly from the company.

Active business throughout the holding period: The corporation must use 80% of its assets in a qualified business during substantially all of the taxpayer's holding period. A startup that shifts business lines over five years — say, from software development (qualified) to financial advisory services (disqualified) — may lose QSBS status for periods it fails the test.

Stacking QSBS: The Multiplier Effect

Each investor gets a separate $10 million (or 10× basis) limit per corporation. If you've invested in three qualifying startups, you potentially have $30 million of tax-free gain available. Moreover, if multiple family members separately invest in the same qualifying startup, each family member has their own independent exclusion limit. For estate planning purposes, gifting QSBS to children or trusts before a liquidity event can multiply the family's available exclusion.

The 10× basis multiplier matters enormously for early investors who got in cheap. If you paid $1 million for QSBS and the company exits for $20 million, your gain is $19 million. The cap is the greater of $10 million or $10 million (10× $1M basis). But if your basis was $3 million and gain is $27 million, the cap is $30 million (10× basis) — meaning the entire $27 million gain could be excluded.

Section 1045 Rollover

If you've held QSBS for at least 6 months but want to sell before the 5-year holding period to capture QSBS treatment, § 1045 allows you to roll the proceeds into new QSBS within 60 days without recognizing gain. The new QSBS's basis equals your original basis (carried over), meaning you're deferring — not eliminating — the gain. If you hold the new QSBS for the remaining period needed to hit 5 years (counting both holding periods together), you may eventually qualify for the 100% exclusion. This rollover is particularly useful for angel investors who need to reallocate capital before the full 5-year mark.

How It Affects You

If you're a startup founder who received founders' stock: Your founders' stock likely qualifies as QSBS — but you need to document it. Verify that when your stock was issued, the corporation's aggregate gross assets were below $50 million (including the proceeds of that issuance itself), the company was a domestic C corporation, and you received the stock as original issuance (not acquired in a secondary transaction). The exclusion per company is the greater of $10 million or 10× your adjusted basis in the stock — which means if you paid $10,000 for founders' shares that grew to $50 million, you can exclude the entire $50 million gain (10× $10,000 basis × 10 = $100M exclusion, capped by your actual gain). If you've spent 10 years building a startup worth $50 million and your QSBS documentation is missing or defective, the difference between qualifying and not can easily be $10–15 million in federal tax alone. Audit your QSBS position now — before the exit.

If you're an angel investor or seed-stage investor: Ask every early-stage company you invest in to confirm QSBS eligibility at the time of your investment — not later. Request a written representation certifying the company's gross asset level at issuance (below $50 million), its active business status (no disqualifying businesses: services, finance, hospitality, farming, law, health, financial services, or technology at a certain scale), and that your shares were original issuance. These representations are most reliable contemporaneously — reconstructing the record 7 years later before an acquisition is harder and creates risk. Also confirm the 5-year holding clock: if you invested in 2022, you need to hold through 2027 to claim full exclusion. Selling early — even in a secondary transaction — breaks the clock on those shares.

If you're investing through a VC fund: Most VC fund structures (limited partnerships with LP investors) do pass through QSBS benefits to individual partners — but the fund structure matters. Partners in a partnership or shareholders in an S corporation that holds QSBS can claim the § 1202 exclusion proportionally, subject to the $10 million-per-company cap being applied at the partner/shareholder level rather than the fund level. However, if the fund invests through a C corporation holding vehicle, the QSBS benefit generally does not flow through to individual investors. Before assuming your VC fund investment gives you QSBS treatment, confirm the fund's legal structure with the GP.

If you're a startup employee who exercised stock options: Stock acquired on exercise of ISOs or NSOs can qualify as QSBS, but the 5-year holding period starts at exercise (not grant). If you exercised in 2022 and the company sells in 2026, you're just under the 5-year hold — and the entire gain is taxable at ordinary rates (see Long-Term Capital Gains). For high-FMV companies, the difference between a 4-year and 5-year hold can be enormous. Early exercise under an early exercise provision (exercising unvested shares, typically with a § 83(b) election) starts the clock earlier and is one reason early exercise is valuable beyond just the § 83(b) itself. For RSUs, the holding period starts at vesting when the shares are actually issued — and most RSUs at large private companies don't vest until a liquidity event, which may mean the 5-year clock can never start early enough to qualify.

State Variations

The 100% federal exclusion does not automatically apply at the state level:

California: Does not conform to § 1202 — all QSBS gain is fully taxable for California income tax purposes (at the current 13.3% top rate). California conformity was eliminated in 1996. This is a significant consideration for California-based founders and investors.
New York: Generally conforms to federal § 1202 treatment for the 10% of gain that remains taxable under certain exclusion percentages, but New York follows its own rules for the 100% exclusion; most QSBS gain is excluded for New York income tax purposes.
Pennsylvania, New Jersey: Do not recognize QSBS exclusions — all gain is taxable at the state level.
Most other states conform to federal treatment, but state-specific analysis is required before assuming the full exclusion applies.

Implementing Regulations

26 CFR 1.1202-1 — Deduction for capital gains on QSBS (the § 1202 100% exclusion for qualified small business stock held more than 5 years)
26 CFR 1.1202-2 — Qualified small business stock; effect of redemptions (redemption rules: significant redemptions during the 4-year window before/after issuance can disqualify shares from QSBS treatment)

Pending Legislation

As of 2026, proposals have been introduced to cap QSBS benefits at lower gain levels (e.g., $5 million or $1 million), limit availability to individuals below certain income thresholds, or extend QSBS treatment to companies in currently excluded industries (particularly advisory and consulting businesses). The Biden administration's 2021 tax proposals would have reduced the 100% exclusion to 50% for taxpayers with adjusted gross income above $400,000; those proposals did not advance. The exclusion faces periodic scrutiny as tax reform discussions highlight its use by high-income venture investors.

Recent Developments

The American Innovation and Jobs Act (proposed, not yet enacted as of 2026) would expand the per-corporation gain cap from $10 million to $50 million and allow rollover treatment for a broader range of reinvestments. IRS guidance has confirmed that QSBS status generally survives common startup transactions like forward splits, reverse splits, and recapitalizations that don't change the economic substance of the stock. The proliferation of special purpose acquisition companies (SPACs) raised questions about whether QSBS investors who receive stock in a SPAC merger retain their QSBS treatment — IRS guidance in this area remains limited, requiring case-by-case analysis.

OBBBA QSBS expansion — $15M cap and new industries (2025): The One Big Beautiful Bill Act expanded the Section 1202 QSBS exclusion significantly. The OBBBA increased the per-investor gain exclusion cap from $10 million (or 10x adjusted basis) to $15 million per investor per issuer, benefiting startup founders and early investors with large gains. The OBBBA also modified the "active business" requirement to explicitly include certain technology, bioscience, and clean energy businesses that had previously been in a gray zone — expanding the universe of qualifying startups. The OBBBA did not change the 5-year holding period requirement.
QSBS stacking — multiple investor strategies: The most sophisticated QSBS planning involves "stacking" the exclusion across multiple entities — a founder holding QSBS stock directly, through a trust, and through a family LLC can potentially exclude $15M × 3 = $45M in gains per issuer under the OBBBA's expanded limits. IRS has scrutinized abusive QSBS stacking where investors transfer QSBS stock to related parties without economic substance to multiply exclusions; the transfers must occur before the issuer raises its aggregate gross assets above $50 million (now $75 million under OBBBA) to be effective. Legitimate estate planning transfers of QSBS to grantor trusts or family members can meaningfully increase the total household QSBS exclusion.
Startup ecosystem and IPO drought: QSBS's value is greatest in liquidity events — IPOs, M&A exits, and secondary sales. The 2022-2024 IPO drought (high interest rates reducing valuations and investor appetite) reduced QSBS realizations; the 2025 market recovery and OBBBA capital gains provisions have improved the exit environment. The QSBS exclusion is a significant incentive for early employees and founders to take compensation in equity rather than cash — at a $15M exclusion value, QSBS stock worth $15M at exit has no federal capital gains tax versus $2.0-2.4M in federal tax at the current 20%/23.8% long-term rate.
QSBS and state tax — California's exclusion: California does not conform to Section 1202's QSBS exclusion — California taxes all capital gains at ordinary income rates (up to 13.3%), regardless of QSBS status. California founders and early employees with large QSBS gains face full state tax even when their federal tax is zero. This creates a planning issue for California-based startups: a founder in California with $15M in QSBS gains saves $0 in state taxes versus a non-California founder. Many venture-backed founders have considered changing California domicile before exit to reduce state tax; California aggressively audits "taxpayer departures" timed to capital events.