Tax Strategy · 6 min read · 2026-02-09
The 9-step QSBS exclusion strategy.
QSBS is the largest startup-equity tax exclusion in the IRC. Most founders and early employees never realize they qualify.
Up to $10M (or more, with stacking) of capital gain can be permanent federal tax-free.
Section 1202 of the IRC allows up to 100% exclusion of capital gains on qualified small business stock held 5+ years, capped at the greater of $10 million or 10× original basis. For founders and early employees of successful startups, the exclusion can save $1.5–3.5 million of federal tax.
The nine indicators
The nine eligibility requirements.
Each is a specific test under Section 1202. Failing any one disqualifies the exclusion. The composite is the qualification framework.
Entity is a domestic C-corporation
Pattern: not LLC, not partnership
QSBS requires C-corp status. LLCs and partnerships do not qualify; many startups convert to C-corps for QSBS eligibility.
Gross assets at issuance < $50M
Threshold: pre-issuance + post-issuance
Gross assets immediately before and immediately after stock issuance must be under $50M. This is the 'small business' threshold.
Active trade or business requirement
Threshold: 80% of assets used in QTB
At least 80% of the corporation's assets must be used in qualified trade or business. Excludes professional services, financial, hospitality, farming, mining.
Original issuance — bought from company directly
Pattern: not secondary purchase
QSBS must be acquired at original issuance from the corporation. Secondary purchases generally do not qualify (with limited exceptions).
5-year minimum holding period
Threshold: 60 months
Must hold 5+ years to qualify for full exclusion. Shorter holds receive proportional exclusion under §1045 rollover rules.
Per-issuer exclusion cap
Threshold: $10M or 10× basis
Exclusion is greater of $10M or 10x original basis per issuer per taxpayer. Stacking via gifts to family members can multiply the cap.
Acquisition date and exclusion percentage
Pattern: 50/75/100% by date
Stock acquired 9/27/2010 or later receives 100% exclusion. Earlier acquisitions: 50–75% exclusion.
Stacking via gifts to family
Pattern: each donee gets cap
Gifting QSBS to family members gives each donee their own $10M cap. Multi-family stacking can exclude $50M+ of gains.
1045 rollover for early exits
Pattern: roll into new QSBS
Sales before 5-year holding can roll proceeds into new QSBS within 60 days, preserving QSBS status and restarting the holding period.
Why QSBS is the largest startup tax break
Section 1202 was enacted in 1993 and significantly expanded by the 2010 Small Business Jobs Act, which made the exclusion 100% for QSBS acquired after September 27, 2010. The combined exclusion can save $1.5–3.5 million of federal tax on a $10 million qualified gain (depending on capital gains rate and state tax interaction).
The benefit is not just for founders. Early employees with stock granted as compensation, angel investors with original-issuance investments, and family members receiving QSBS gifts all qualify. The breadth of eligibility is much larger than typical retail awareness.
The C-corp requirement
QSBS requires the issuing entity to be a C-corporation. Many early-stage startups operate as LLCs or partnerships for organizational simplicity. LLCs and partnerships are not eligible. The entity must convert to C-corp before stock issuance to qualify.
This creates a planning dynamic. Founders who realize the QSBS opportunity early enough to incorporate as C-corp at the appropriate time capture the benefit. Founders who operate as LLCs and only convert at later financing rounds may forfeit QSBS on the early founder shares.
Stacking via gifts
The $10 million per-issuer cap applies per taxpayer. Gifting QSBS to family members — spouse, children, parents — gives each donee their own $10M cap on the same issuer's stock. Multi-family stacking can exclude $50 million or more of gain on a single issuer's exit.
The discipline is timing. Gifts must be made before exit, with proper valuation and gift-tax filings. Gifts made shortly before announced exits face IRS scrutiny under step-transaction doctrine. Strategic stacking benefits from earlier planning, ideally years before any liquidity event is contemplated.
1045 rollover for short-tenure exits
Section 1045 allows tax-free rollover of QSBS gain into new QSBS if reinvested within 60 days. The rollover preserves QSBS status and restarts the 5-year holding clock. For early-stage investors who exit before 5 years (e.g., acquisition by another startup), the rollover keeps the QSBS pathway open.
Operationally, the rollover requires direct reinvestment into qualifying QSBS within 60 days of sale. Most accredited-investor angel platforms support this. The mechanics require attention but the benefit is substantial.
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Common questions
Questions.
Does QSBS apply to RSUs?
Sometimes. Restricted stock units that vest into qualifying C-corp stock can qualify, with specific rules about acquisition date and §83(b) elections.
Can I QSBS-qualify ISO exercises?
ISO exercises produce stock that, if otherwise qualifying, can be QSBS. The ISO exercise itself doesn't disqualify.
Does the exclusion apply to state tax?
Varies by state. California, Pennsylvania, and others do not conform to QSBS. Federal-only exclusion in non-conforming states.
What about secondary sales?
QSBS sold by the original holder to a third party retains QSBS status for the seller. The buyer's purchase is not at original issuance and typically doesn't qualify.
Will Congress eliminate QSBS?
Periodically discussed but not seriously threatened. The exclusion is bipartisan-popular as economic-development incentive.
Should I delay an exit for QSBS?
If the exit is within 12 months of the 5-year mark, often yes. The tax savings frequently exceed any deal-timing cost. Below 4 years, the §1045 rollover may be the better path.
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