QSBS
QSBS (Qualified Small Business Stock) is an IRS provision under Section 1202 that excludes up to $10M-$15M (or 10x basis) in capital gains from federal tax. The One Big Beautiful Bill Act (signed July 4, 2025) created a two-regime structure: stock issued on or before July 4, 2025 follows the pre-OBBBA rules ($10M or 10x cost basis cap, $50M gross-assets ceiling, 5-year hold for the full exclusion); stock issued after July 4, 2025 follows the OBBBA rules ($15M cap inflation-adjusted after 2026, $75M gross-assets ceiling, tiered holding with 50% exclusion at 3 years, 75% at 4 years, 100% at 5 years, maximum exclusion up to $750 million). The exclusion is available to founders, early employees, and early investors. It is one of the most valuable tax benefits in the US startup ecosystem and one of the most consistently underused by founders who don't know how the rules work. It is the difference between paying federal long-term capital gains tax (currently 20 percent at the top bracket plus 3.8 percent NIIT, often 30+ percent including state) and paying nothing on a substantial chunk of gain.
The qualifying requirements: the company must be a domestic C-corporation at the time the stock was issued (LLCs, S-corps, and foreign entities don't qualify; this is why most VC-backed startups incorporate as Delaware C-corps), have gross assets under $50 million when the stock was issued for pre-OBBBA stock (on or before July 4, 2025) or under $75 million for post-OBBBA stock (after July 4, 2025, inflation-adjusted after 2026), use at least 80 percent of assets in an active qualified trade or business (excludes finance, professional services, hospitality, and certain other industries), and the shareholder must have acquired the stock directly from the company (not on a secondary market), held it for at least 5 years (post-OBBBA stock gets a tiered exclusion: 50% at 3 years, 75% at 4 years, 100% at 5 years), and the company must continue to meet the active-business requirement during the holding period. The per-issuer exclusion cap is the greater of $10 million pre-OBBBA ($15 million post-OBBBA, inflation-adjusted after 2026) OR 10x the shareholder's adjusted basis in the stock. Sophisticated planning techniques: stacking (gifting QSBS-eligible shares to family members or trusts before exit so each recipient gets their own $10M exclusion), state-level treatment varies (California taxes QSBS as ordinary state income; some states fully conform to federal exclusion; the savings calculation depends heavily on state residency at sale). The most-missed pitfall: the 5-year clock starts at original issuance, not at vesting; founders who exercise options late often lose the QSBS clock they could have started years earlier. The most-missed planning move: gifting QSBS-eligible shares to a non-grantor trust years before exit can multiply the family's exclusion many times over.
Ryan's Take
QSBS is the most valuable line item most founders never optimize for. Hitting the 5-year clock plus structuring stacking to family trusts can turn a $50 million founder exit into a fully tax-free outcome, versus an exit a year too early paying $15+ million in federal and state tax. The structuring has to happen years before exit; it cannot be retrofit at the LOI stage. Every founder should know their QSBS clock for every share class they hold, every founder who plans on any kind of multi-million-dollar exit should have a tax attorney looking at stacking strategies by Series A, and every founder whose stock is issued late through option exercises is leaving real money on the table that competent planning would have captured. This is the kind of work that pays for itself a hundred times over.
What founders get wrong: Assuming the QSBS clock starts when the stock vests or when options are exercised. The clock starts at original issuance (when restricted stock is purchased or when options are exercised, depending on the structure). Founders who delay exercise of cheap early options often start the 5-year clock years later than they could have, costing real money at exit. Talk to a tax attorney about timing your exercises specifically to start the QSBS clock.
Related: Exit Strategy · Acquisition · IPO · C Corporation · Founder Vesting
FAQ
What is QSBS?
Qualified Small Business Stock, an IRS provision under Internal Revenue Code Section 1202 that lets founders, early employees, and early investors exclude federal capital gains tax on qualifying stock. Pre-OBBBA (stock issued on or before July 4, 2025): up to $10 million or 10x cost basis, 5-year hold. Post-OBBBA (after July 4, 2025): $15 million cap, $75M gross-assets ceiling, tiered exclusion (50% at 3 years, 75% at 4, 100% at 5).
What are the requirements for QSBS treatment?
Domestic C-corporation at issuance, gross assets under $50 million (pre-OBBBA, stock on or before July 4, 2025) or $75 million (post-OBBBA, after July 4, 2025) when stock was issued, at least 80% of assets in an active qualified trade or business, stock acquired directly from the company, and 5-year hold for full exclusion (pre-OBBBA all-or-nothing; post-OBBBA tiered: 50% at 3 years, 75% at 4, 100% at 5). Company must continue to meet the active-business requirement during the holding period.
Can QSBS exclusion exceed $10 million?
Yes, multiple ways. The per-shareholder cap is the greater of $10M ($15M for post-OBBBA stock issued after July 4, 2025) or 10x adjusted basis. The OBBBA's 10x-of-$75M math means post-OBBBA exclusion can reach up to $750 million per founder per company. "Stacking" by gifting QSBS shares to family members or non-grantor trusts before exit gives each recipient their own cap, multiplying the family's total exclusion.
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