QSBS Section 1202: 100% Capital Gains Exclusion Rules

Key Takeaways

• QSBS Section 1202 excludes up to 100 percent of federal capital gains tax on qualifying C corporation stock held five or more years, capped at the greater of $10 million or 10 times adjusted basis per issuer.
• Three gates must clear: the corporation must be a domestic C corp with assets at or below the statutory ceiling, at least 80 percent of assets must be in an active qualified business, and you must acquire the stock directly from the issuer, not on the secondary market.
• The most dangerous planning mistake is assuming LLC or S corporation interests qualify; only C corporation stock counts, and the clock restarts on conversion.
• Several states, including California, do not conform to Section 1202, so a full federal exclusion can still leave a large state capital gains liability.

What It Is

QSBS is stock in a domestic C corporation that, when issued, had aggregate gross assets at or below a statutory ceiling and was engaged in an active qualified trade or business. The investor must acquire the stock directly from the company (not on the secondary market) in exchange for cash, property, or services.

The exclusion is capped per taxpayer, per issuer, at the greater of a fixed dollar amount or 10 times the investor's adjusted basis in the stock. Gain above that cap is taxed at the usual long-term capital gains rate.

The Intuition

Congress designed Section 1202 in 1993 to channel private capital into small US businesses. The core idea: if you accept the risk of funding a young C corporation and you wait years before selling, the government will share less of your upside. The long holding period discourages quick flips, and the active-business requirement pushes money toward operating companies rather than holding vehicles.

For founders, early employees taking stock, and angel investors, the exclusion can be the single largest determinant of after-tax outcomes on a successful exit.

How It Works

Three gates must clear for the full exclusion:

1. Issuer test. The corporation must be a domestic C corp and have aggregate gross assets at or below the statutory ceiling at all times through issuance (historically $50 million; raised to $75 million for stock issued after July 4, 2025 under the OBBBA).
2. Active business test. At least 80 percent of the corporation's assets must be used in a qualified trade or business. Service businesses in health, law, accounting, consulting, finance, and several others are excluded.
3. Holding period. Under the original regime (stock issued on or before July 4, 2025), you need a five-year hold for any exclusion. For stock issued after July 4, 2025, a tiered schedule applies: 50 percent exclusion at three years, 75 percent at four years, and 100 percent at five or more years.

The per-issuer cap is the greater of $10 million (or $15 million, indexed, for post-OBBBA stock) or 10 times the aggregate adjusted basis of the QSBS disposed of that year. The excluded portion is also exempt from the 3.8 percent Net Investment Income Tax under Section 1411.

Worked Example

Assume you invested $1 million in a qualified C corporation in June 2020 in exchange for founder stock, then sold in July 2026 for $50 million. The stock meets all issuer and active-business tests.

Holding period: 6 years (meets 5-year bar for pre-OBBBA stock)
Realized gain: $50,000,000 - $1,000,000 = $49,000,000
Per-issuer cap: greater of $10,000,000 or 10 x $1,000,000 = $10,000,000
Excludable gain: $10,000,000 (100 percent exclusion applies)
Taxable gain: $49,000,000 - $10,000,000 = $39,000,000

The first $10 million of gain escapes federal capital gains tax entirely. The remaining $39 million is taxed at long-term capital gains rates plus the NIIT.

Common Mistakes

1. Assuming LLC interests qualify. Only stock in a C corporation counts. Converting from an LLC or S corp to a C corp works prospectively, but the holding period and the gross-assets test start fresh on conversion, which often surprises founders.
2. Missing the original-issuance requirement. Buying founders' shares in a secondary sale disqualifies the buyer. QSBS treatment only attaches to stock acquired directly from the issuer.
3. Ignoring redemptions that taint the stock. Certain redemptions by the corporation from the holder, related parties, or significant shareholders within defined windows can disqualify subsequent issuances under Section 1202(c)(3). Buybacks need legal review before closing.
4. Forgetting state conformity. Several states, including California for most years, do not conform to Section 1202. A full federal exclusion can still leave a large state capital gains bill.
5. Applying the wrong cap to post-OBBBA stock. Stock issued after July 4, 2025 uses the $15 million base cap and the tiered holding periods. Mixing the old five-year, $10 million regime with the new one leads to miscalculated exclusions.

Frequently Asked Questions

Q: What is QSBS Section 1202 in simple terms? It is a federal tax rule that lets early investors and founders in small C corporations exclude up to 100 percent of their capital gain from federal tax when they sell, if they held the stock for at least five years and the company met certain size and business-type tests at issuance.

Q: How does QSBS Section 1202 affect investment decisions? It makes C corporation structure significantly more attractive for startup founders and early investors, since the exclusion can eliminate a multimillion-dollar tax bill at exit. Investors evaluate QSBS eligibility at the time of first investment, not at exit, because the active-business and asset-ceiling tests must be met when stock is issued.

Q: What is a real-world example of QSBS Section 1202? An angel investor puts $1 million into a qualifying C corp in 2020 and sells in 2026 for $50 million. The gain is $49 million. The exclusion cap is the greater of $10 million or 10 times basis ($10 million). The first $10 million of gain escapes federal capital gains tax entirely; the remaining $39 million is taxed at long-term rates.

Q: How can investors protect QSBS eligibility? Acquire stock directly from the issuer at original issuance, hold for at least five years, confirm the company has not violated the active-business test or the gross-asset ceiling, and monitor for redemptions that could taint the shares under Section 1202(c)(3). Track state conformity separately, since California historically imposes its own tax.

Q: How is QSBS Section 1202 different from a Section 1031 exchange? A 1031 exchange defers tax by rolling proceeds into a like-kind replacement real estate asset. QSBS Section 1202 permanently excludes the gain, there is no deferral or replacement requirement. The QSBS benefit is also limited to C corporation stock held long-term, while 1031 applies only to real property.

Sources

1. Cornell Legal Information Institute. "26 U.S. Code Section 1202, Partial exclusion for gain from certain small business stock." https://www.law.cornell.edu/uscode/text/26/1202
2. Internal Revenue Service. "Chief Counsel Memorandum 202418001, Section 1202." https://www.irs.gov/pub/irs-wd/202418001.pdf
3. Wilson Sonsini Goodrich & Rosati. "Understanding Section 1202: The Qualified Small Business Stock Exemption." https://www.wsgr.com/en/insights/understanding-section-1202-the-qualified-small-business-stock-exemption.html
4. Plante Moran. "Almost too good to be true: The Section 1202 qualified small business stock gain exclusion." https://www.plantemoran.com/explore-our-thinking/insight/2021/08/the-section-1202-qualified-small-business-stock-gain-exclusion

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.