QSBS (Section 1202 / Qualified Small Business Stock)
Qualified Small Business Stock under IRC Section 1202 — a tax provision providing up to 100% federal capital gains exclusion (capped at $10M or 10x basis) on gains from qualifying C-corp stock held more than 5 years.
Full Definition
Section 1202 is one of the most significant tax benefits in US tax law for founders and early investors of C-corporations. For stock acquired after September 27, 2010, the provision allows 100% exclusion of capital gains up to the greater of $10M or 10x basis. For a founder whose stock has a $0 basis and sells for $10M, that's $10M of tax-free proceeds — federal savings up to $2.38M (20% LTCG + 3.8% NIIT). The provision was designed to incentivize investment in small businesses but has become essential tax planning for C-corp founders.
How it actually works: Qualification requirements: (1) C-corporation status — must be an active-business C-corp at issuance and substantially throughout holding period; (2) Original issuance — stock must be acquired directly from the corporation for money, property, or services (not from another shareholder); (3) Active business test — 80% of assets must be used in a qualified active trade or business (excludes investment companies, hotels, restaurants, professional services like law/accounting/health/engineering); (4) Gross assets test — corporation's gross assets cannot exceed $50M at the time of issuance or immediately after (as of recent amendments); (5) 5-year holding period — stock must be held more than 5 years; (6) No redemption during key periods — corporation shouldn't redeem stock from the holder during specific windows around issuance.
Exclusion percentages depend on acquisition date: Stock acquired 8/10/1993-2/18/2009: 50% exclusion. Stock acquired 2/18/2009-9/27/2010: 75% exclusion. Stock acquired after 9/27/2010: 100% exclusion. The 100% rate made QSBS massively more valuable after 2010.
Cap: the greater of $10M or 10x basis. For a founder with very low basis (common for founders), the $10M cap applies. But for investors paying meaningful capital for stock, 10x basis can exceed $10M — an investor paying $3M for stock can exclude up to $30M of gain.
Stacking strategies: multiple shareholders each get their own cap. A founder giving stock to family members (while still qualifying) can effectively multiply exclusion. Trusts can be used carefully to stack exclusions across beneficiaries.
Important notes (2025 landscape): QSBS is under continuous policy review. Historical reform proposals have targeted the 100% rate and the cap amounts. Founders should work with current tax counsel — rules can change. Also, state-level conformity varies: California and several states don't conform to federal QSBS treatment, so state tax still applies. Always verify current federal and state law with a qualified tax advisor before relying on QSBS treatment.
Seller vs. Buyer Perspective
If you founded or invested in a C-corp, QSBS is potentially the most valuable tax asset you own. Verify eligibility early — at founding, not at exit. Key actions: (1) confirm C-corp status since issuance; (2) verify active business test (not a services business disqualified under 1202); (3) confirm 5-year holding period met before sale; (4) avoid redemptions that could disqualify the stock; (5) consider gifting to family members/trusts to stack exclusions; (6) work with tax counsel to document qualification. If you're preparing to sell and will cross the 5-year mark, time the sale to qualify. The savings can be $2-5M+ on a mid-sized deal. Beware: ordinary-income portions of asset sales don't qualify; stock sale structure matters.
As a buyer, QSBS doesn't directly affect your tax position — it's about the seller's taxes. But it does affect seller motivation and deal structure. QSBS-qualified sellers strongly prefer stock sale structures (to preserve QSBS treatment). Asset sales destroy QSBS benefit. F reorganization can preserve QSBS. Understanding seller's QSBS position helps structure deals that work for both sides — sometimes a slight price discount for stock sale structure saves the seller far more than it costs you.
Real-World Example
A founder starts a C-corp in 2016 with $100K of invested capital, becoming the sole shareholder. In 2024, she sells all her stock for $12M in a stock sale transaction. QSBS analysis: (1) C-corp status maintained throughout: yes; (2) Original issuance: yes; (3) Active business: qualifying B2B software company; (4) Gross assets below $50M at issuance: yes, started small; (5) 5+ year holding: yes (8 years); (6) No disqualifying redemptions: yes. QSBS exclusion cap: greater of $10M or 10x basis. Basis: $100K. 10x basis = $1M. Cap = $10M. Gain: $12M - $100K basis = $11.9M. Exclusion: $10M. Remaining taxable gain: $1.9M at 20% LTCG + 3.8% NIIT = $452K federal tax. Without QSBS, full $11.9M would be taxable at same rates = $2.83M federal tax. QSBS savings: $2.38M. On top of that, state tax treatment varies — if in a state that conforms, no state tax on the excluded portion; if not (e.g., California), state tax applies to full gain.
Why It Matters & Common Pitfalls
- !Verify at founding, not at exit. Fixing QSBS issues at exit is often impossible.
- !Service businesses disqualified. Professional services (law, accounting, health, engineering) don't qualify.
- !C-corp requirement. S-corp election disqualifies. LLC taxed as partnership disqualifies.
- !Redemptions can disqualify. Company buybacks during specific windows can disqualify a shareholder's QSBS status.
- !Asset sale destroys QSBS. The benefit requires stock disposition.
- !State conformity varies. Federal benefit doesn't automatically flow through at state level.
- !Stacking opportunities. Family gifts, trusts, and multiple entities can multiply exclusion if planned early.
- !Rollover into new QSBS. Section 1045 allows rollover of QSBS gains into new QSBS with continued holding period.
- !Policy risk. QSBS rules have been targeted for reform. Stay current on legislation.
Frequently Asked Questions
What is QSBS (Section 1202)?↓
What are the QSBS requirements?↓
How much tax can QSBS save?↓
What can disqualify QSBS?↓
Related Terms
Capital Gains (Short vs Long Term)
The tax treatment of gain from selling a capital asset (like a business). Long-term capital gains (asset held >1 year) are taxed at preferential federal rates (typically 20%); short-term gains and ordinary income can be taxed at up to 37%.
Stock Sale
A transaction in which the buyer purchases the stock (or equity interests) of the target company, acquiring the entity itself along with all its assets and liabilities — contrast with an asset sale.
F Reorganization
A tax-free reorganization under IRC Section 368(a)(1)(F) that restructures an S-corporation into a new holding company — often used to give buyers a stepped-up tax basis while preserving stock-sale treatment for the seller.
Installment Sale
A sale where the seller receives payments over multiple years and — if elected — recognizes the taxable gain ratably as payments are received rather than all in the year of sale. Available for seller notes and earnouts in most circumstances.
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Disclaimer: The information provided on this page is for educational and informational purposes only. It should not be considered financial, legal, or investment advice. Business valuations depend on many factors specific to each situation. Always consult with qualified professionals — including business brokers, CPAs, and M&A attorneys — before making acquisition or sale decisions. LegacyVector is not a licensed broker, financial advisor, or attorney. Data shown may be based on limited samples and may not reflect current market conditions.
LegacyVector Research Team
Reviewed by M&A professionals · Updated April 2026