Qualified Small Business Stock (QSBS) can exclude up to $10M in federal capital gains. Here's how to qualify, when to elect, and the traps to avoid.
QSBS (Qualified Small Business Stock) is Section 1202 of the IRS code — one of the most powerful tax benefits available to startup founders and early employees. Held correctly, it excludes up to $10M (or 10x basis, whichever is greater) in federal capital gains on exit. Structured incorrectly, the exemption disappears silently.
The company must be a US C-corporation at the time of issuance. Total gross assets must be under $50M at the time of issuance and immediately after. Shares must be held for 5+ years before sale. Company must be in a qualified trade or business (excludes finance, professional services, real estate, farming, hospitality).
Federal exemption: greater of $10M or 10x cost basis, per taxpayer, per company. On a $50M exit with $100K basis: full $10M federal exemption plus long-term capital gains treatment on the remainder. On a $500M exit with $500K basis: potentially $5M exempt (10x basis exceeds $10M).
Fully conforming states (mirror federal): most states, including Texas, Florida, Washington. Partially conforming: New York (100% conformity as of 2024). Non-conforming (tax at ordinary state rates): California, Alabama, New Jersey, Pennsylvania. If you're a California founder, plan for state tax on gains even with federal QSBS.
Converting from LLC to C-corp after gross assets exceed $50M. Failing to hold shares 5 full years before sale. Company drifts into non-qualified trade or business (e.g., adds financial services line). Redemption of shares by the company can taint QSBS status for all shareholders. Consult tax counsel before any material corporate transaction.
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