C-Corp Advantage
QSBS and Section 1202: The C-Corp Tax Break S-Corps Cannot Get
A C-Corp founder who holds original shares five-plus years and sells for $10M can owe zero federal capital gains tax on the entire $10M. An identical S-Corp founder owes roughly $2.4M in federal capital gains. That single difference outweighs every other line in the comparison.
Updated June 2026 · Source: IRC Section 1202 as amended by the 2025 OBBBA (Cornell LII)
2025 OBBBA update: two QSBS regimes now run in parallel
The One Big Beautiful Bill Act (Public Law 119-21, signed 4 July 2025) expanded Section 1202 for newly issued stock. Which rules apply depends entirely on when the stock was acquired:
- Acquired after 4 July 2025: tiered exclusion of 50% at a three-year hold, 75% at four years, and 100% at five years. Per-issuer cap is the greater of $15M or 10x basis. Gross asset test rises to $75M. The $15M and $75M figures index for inflation from 2027.
- Acquired on or before 4 July 2025: the prior rules stand. No exclusion until a full five-year hold (then 100% for post-September 2010 stock), $10M or 10x basis cap, $50M gross asset test.
Source: IRC Section 1202 as amended by OBBBA; AICPA, The Tax Adviser (Nov 2025).
The dollar example
Founder issues 1,000,000 shares at $0.001 in August 2025 (basis $1,000), so the post-OBBBA rules apply. Company exits in 2031 for $50M. Capital gain: $49,999,000. QSBS exclusion: $15M (greater of $15M or 10x $1,000 basis = $10,000; the flat cap wins). Held more than five years, so 100% of that $15M is excluded. Taxable gain: $34,999,000 at 23.8% = $8.33M tax. Without QSBS: $11.9M tax. Saving: $3.57M just from the base exclusion. Stacking to a spouse, children, or trusts multiplies the $15M cap.
What Section 1202 Is
IRC Section 1202, enacted 1993 and expanded to a 100% exclusion for stock acquired after 27 September 2010, lets a non-corporate taxpayer exclude gain from the sale of qualified small business stock. The 2025 OBBBA expanded it again for stock acquired after 4 July 2025 (see the box above).
Exclusion amount: The greater of $15M or 10x adjusted basis for stock acquired after 4 July 2025, or $10M or 10x basis for earlier stock. Per-issuer per-taxpayer cap, indexed for inflation from 2027.
No AMT preference: Post-2010 QSBS (100% exclusion) creates no AMT preference item. The full exclusion applies for regular tax and AMT purposes.
Who can hold: Non-corporate taxpayers: individuals, partnerships, S-Corps as holders, grantor trusts, ESBTs. The issuer must be a C-Corp; the holder must be a non-corporate taxpayer.
The Seven Eligibility Requirements
1. Domestic C-Corporation
The issuer must be a domestic C-Corp at issuance and throughout substantially all of the holding period. S-Corp, LLC, and partnership shares never qualify.
2. Original issuance
Stock acquired directly from the corporation at original issue in exchange for money, property, or services. Secondary-market purchases from shareholders do not qualify.
3. Gross asset test
Corporation's aggregate gross assets (tax basis, not FMV) must not exceed $75M for stock issued after 4 July 2025, or $50M for earlier issuances, measured before and immediately after the issuance. Both figures index for inflation from 2027. Once crossed, no new QSBS can be issued but prior shares retain eligibility.
4. Active business: 80% of assets
At least 80% of corporate assets must be used in the active conduct of a qualified trade or business throughout the holding period.
5. Qualified trade or business
Must not be in the excluded service categories: health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage, banking, insurance, investing, leasing, farming, mineral extraction, or hospitality.
6. Holding period (tiered after OBBBA)
For stock acquired after 4 July 2025, a three-year hold gives 50% exclusion, four years gives 75%, and five years gives the full 100%. Stock acquired on or before that date needs a five-year hold for any exclusion. The clock starts only when the corporation is a C-Corp and only for originally issued shares.
7. Per-issuer cap
The greater of $15M or 10x basis per issuer per taxpayer for stock acquired after 4 July 2025 ($10M for earlier stock); the dollar cap indexes for inflation from 2027. Spouses each get their own cap for the same issuer.
Why an S-Corp Election Kills the QSBS Clock
The QSBS five-year holding period begins only when the entity is a C-Corp. An LLC or S-Corp that converts to C-Corp resets the QSBS clock to the conversion date. Any appreciation before the conversion is not QSBS-eligible.
A C-Corp that elects S status terminates QSBS eligibility for shares held during the S period. If it later re-converts to C-Corp, the new QSBS clock starts at the re-conversion date.
Practical implication: VC-track founders who start as an LLC or S-Corp lose QSBS benefit proportional to the time spent in non-C-Corp status. Incorporate as a Delaware C-Corp from inception, even if you have no revenue and no current fundraising plans.
QSBS Stacking Strategies
The exclusion is per-taxpayer per-issuer. Gifting QSBS shares to family members before sale multiplies the exclusion. Each recipient gets their own cap ($15M for stock acquired after 4 July 2025, $10M for earlier stock):
- Founder holds shares: one full cap
- Spouse: a separate cap (each spouse has its own for the same issuer)
- Adult children: each gets their own cap
- Non-grantor trusts for children: each trust is a separate taxpayer with its own cap
Gifts must be bona fide. The substance-over-form doctrine applies. Gifts made immediately before a signed letter of intent may be challenged. Gifted shares carry over the original holding period and acquisition date. Consult a tax attorney before implementing stacking strategies.
State-Level QSBS Conformity
| State | Conforms? | Notes |
|---|---|---|
| California | No | Full gain taxed at CA rates (up to 13.3%). Major issue for founders. |
| New York | Yes (rolling) | Generally conforms. NYC adds city tax on top. |
| Massachusetts | Yes (with caveats) | Generally conforms. Verify current year. |
| New Jersey | No | Does not conform; taxes full gain at NJ rates. |
| Pennsylvania | No | Does not conform to federal capital gains exclusion rules. |
| Texas / Florida | N/A | No state income tax. QSBS issue does not arise. |
| Most other states | Yes (rolling) | Most income-tax states conform. Verify current year with state DOR. |