S-Corp vs C-Corp in 2026 (QSBS Eligibility)
How to Choose the Right Structure for Tax Efficiency and Exit Strategy
Section 1202 may be the most valuable tax benefit in the Internal Revenue Code. After OBBBA, it is also the most consequential planning conversation a founder can have before a sale.
The Quick Read
The OBBBA quietly rewrote one of the most powerful exemptions in the tax code. If you have C-corp stock issued before July 4, 2025, you're locked into the old $10M / $50M / 5-year-cliff rules. After that date, the new rules are dramatically better: $15M cap, $75M asset ceiling, partial exclusions at year 3 and 4. Issuance date is destiny — there is no retroactive fix.
- What OBBBA Changed (and What It Did Not)
- Two Regimes: Pre-OBBBA vs. Post-OBBBA QSBS
- The New Tiered Holding Period (Visualized)
- Eligibility Requirements That Did Not Change
- Stacking: Multiplying the $15M Exclusion
- State Conformity: Where the Federal Exclusion Actually Sticks
- Worked Example: 2024 Founder vs. 2026 Founder
- Frequently Asked Questions
In 1993, Congress added Section 1202 to the Internal Revenue Code. For three decades it sat in the shadows — too narrow for most owners, too obscure for most CPAs. The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, has dragged it into the center of the room. If you own C-corp stock issued before July 4, 2025, you're operating under the old QSBS rules and may not realize it. If you're issuing stock after that date — or contemplating an entity conversion — you're likely the most under-utilized post-OBBBA story in the code.
OBBBA raised the per-issuer exclusion cap from $10 million to $15 million. It raised the gross-asset ceiling for qualifying corporations from $50 million to $75 million. And — the most strategically important change of all — it replaced the old all-or-nothing five-year cliff with a tiered exclusion: 50% at three years, 75% at four years, 100% at five years. Both dollar thresholds will be indexed for inflation beginning in 2027.
If your company sells for $50 million on stock with a near-zero basis, your federal tax savings under the new rules can exceed $3.5 million. With layered family planning — gifts to a spouse, gifts to non-grantor trusts — that number can move into the eight figures. We'll walk through the Tom-and-Maya case later — same business economics, two different issuance dates, $3.57M+ difference in federal outcome. This is no longer a fringe provision. It is, for the right owner, the single highest-leverage line item in the entire tax code.
What OBBBA Changed in Section 1202 — and What It Did Not
The OBBBA changes apply only to QSBS issued after July 4, 2025. Stock issued on or before that date stays on the old rules. There is no transition relief, no election to opt in, and the new acquisition-date rules block the obvious workaround of exchanging old QSBS for new QSBS to reset the clock. Once your stock is issued, the §1202 rules in effect at issuance are locked — you can't retroactively reclassify pre-OBBBA stock to capture the new $15M cap, the $75M asset ceiling, or the tiered holding period. Issuance date is destiny, and this is the most consequential pre-decision in the QSBS playbook. This grandfathering split is the single most important fact in the post-OBBBA landscape, and most founders we meet have not had it explained to them clearly.
What did not change is just as important. The stock must still be issued by a domestic C-corporation. The corporation must still be engaged in a qualified trade or business. The taxpayer must still acquire the stock at original issuance. The list of excluded service businesses is unchanged. And the §1045 rollover — the ability to defer gain by reinvesting in new QSBS within 60 days — survived intact.
Two Regimes Now Coexist: Pre-OBBBA vs. Post-OBBBA QSBS
For the next several years, every QSBS analysis begins with the same question: when was your stock issued? The answer determines whether your per-issuer cap is $10M or $15M, and whether your asset ceiling is $50M or $75M.
QSBS Rules: Old Regime vs. New Regime
PRE-OBBBA POST-OBBBA
Issuance window: on/before 7/4/2025 after 7/4/2025
Per-issuer cap: $10M or 10x basis $15M or 10x basis
Gross-asset ceiling: $50M $75M
Holding period: 5 years (cliff) 3 / 4 / 5 yrs (tiered)
Exclusion at 3 yrs: 0% 50%
Exclusion at 4 yrs: 0% 75%
Exclusion at 5+ yrs: 100% 100%
Inflation indexing: none begins 2027
If your stock was issued before July 5, 2025, you're not penalized — you keep the regime you planned under. But if you're issuing new stock today, you get a meaningfully better deal, and the difference compounds across stacking, state conformity, and the timing of partial-liquidity events.
The New Tiered Holding Period, Visualized
Of all the OBBBA changes, the tiered holding period is the one that most rewires your strategy. Under the old rules, an exit at year four returned the same federal capital gains bill as an exit at year two: full tax. Under the new rules, an exit at year three excludes half the gain — on a $15M gain, that's $7.5M of federally tax-free proceeds where the old rules gave you zero. An exit at year four excludes three-quarters. The cost of an early tender offer or partial-secondary sale just dropped by half or more.
Strategically, this changes three things at once. Tender offers and secondary sales — once tax-disastrous before year five — are now planning-viable at year three or four. Founders considering an early acquisition can model partial exclusion as a real outcome rather than a binary loss. And acquirers structuring earnouts now have a reason to push closing into a tier boundary, because the seller's after-tax dollar moves materially across each cliff.
Eligibility Requirements That Did Not Change
The OBBBA expanded the prize but kept the gate. To qualify for any tier of the exclusion, the stock must still satisfy each of the following at the time of issuance:
- The issuer must be a domestic C-corporation. S-corps, LLCs, and partnerships do not qualify — full stop. Stock acquired by an LLC and later contributed to a C-corp does not get retroactive QSBS treatment.
- The corporation's aggregate gross assets must be under the ceiling immediately after issuance — $50M for pre-OBBBA stock, $75M for post-OBBBA stock.
- The stock must be acquired at original issuance, in exchange for cash, property, or services. Secondary purchases never qualify.
- At least 80% of the corporation's assets must be used in a qualified active trade or business throughout substantially all of the holding period.
- Certain trades are excluded entirely: health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage, banking, insurance, financing, leasing, investing, farming, mining and extraction, and any hotel, motel, restaurant, or similar business. The reputation-or-skill test still applies.
Two operational details deserve emphasis. Stock acquired in exchange for services is QSBS-eligible — but the §83(b) election timing controls the start of the five-year clock for restricted stock; if you miss the 30-day window, you can quietly forfeit years of holding period and, on a $15M exclusion, that lapse can cost the full $3.57M in federal tax. And if you're an S-corp owner converting to a C-corp, you do start a fresh QSBS clock, but only on stock issued after the conversion; appreciation accrued during the S-corp years gets no exclusion treatment.
Stacking: How Founders Multiply the $15M Exclusion
The Section 1202 cap is per taxpayer per issuer. That single phrase is the foundation of every advanced QSBS plan. A married couple where each spouse holds QSBS is two taxpayers — $30 million in combined exclusion. Add two non-grantor trusts and the household reaches $60 million. Add gifts to adult children and the number keeps climbing.
Non-grantor trusts are the workhorse of stacking strategy. A non-grantor trust has its own taxpayer ID and, on the prevailing reading of §1202(h), gets its own per-issuer cap. Under §1202(h), the recipient of gifted QSBS steps into the donor's shoes — preserving the original issuance date, the holding period, and the QSBS character of the shares. The estate-and-gift planning piece runs in parallel: shares gifted to a non-grantor trust early in the company's life are valued low for gift-tax purposes and freeze future appreciation outside the donor's estate.
The ceiling is timing. The IRS and the case law take a hard line on assignment-of-income: gifts made after a letter of intent is signed, or after a sale process is materially advanced, can be re-attributed to the original holder. Stacking works only when the transfer happens well before any sale is on the horizon — measured in years, not weeks. Founders who run this play correctly typically put the trust structure in place at or shortly after C-corp formation, fund it with founder shares while value is nominal, and let the asset appreciate inside the trust.
State Conformity: Where the Federal Exclusion Actually Sticks
A federal exclusion is not a national one. State conformity to §1202 is patchy, and the gap between the federal bill and the all-in tax bill can be material.
For 2026, the principal non-conforming states are California (full state tax up to 13.3%, no QSBS recognition), Pennsylvania (flat 3.07%, no exclusion), Alabama, and Mississippi. New Jersey, historically a non-conformer, conforms beginning January 1, 2026 under bill A4455/S4503 — a meaningful change for Northeast founders.
If you're a Charlotte or Carolinas-based owner, the news is favorable: North Carolina conforms to federal QSBS treatment, so your §1202 exclusion lands at zero combined tax on excluded gain. If you have multistate exposure or an upcoming domicile change, the residency conversation belongs before the sale closes, not after — change-of-domicile planning is one of the few moves that can rescue a California founder from the 13.3% leak, which on a $15M excluded gain is roughly $2 million of state tax that simply doesn't have to leave the household.
Worked Example: 2024 Founder vs. 2026 Founder
"Tom" (issued 2024) vs. "Maya" (issued 2026)
Tom co-founded a Charlotte SaaS C-corp in 2024 and was issued 1,000,000 shares of QSBS at par. The company sells in 2030 for $25M on his shares; he held more than five years. Tom is governed entirely by pre-OBBBA rules.
Pre-OBBBA exclusion cap: $10,000,000
Excluded gain (federal): $10,000,000
Taxed gain at 23.8% (LTCG + NIIT): $15,000,000
Federal tax bill: $3,570,000
Maya forms a Charlotte SaaS C-corp in 2026 and is issued 1,000,000 shares of QSBS. The company also sells for $25M on her shares; she also holds more than five years. Maya is governed by post-OBBBA rules — and ran a stacking plan two years before the sale.
Post-OBBBA exclusion cap (per taxpayer): $15,000,000
Maya's individual exclusion: $15,000,000
Spouse's individual exclusion (gifted shares): $10,000,000
Total federal exclusion across the household: $25,000,000
Federal tax bill: $0
Tom's outcome was excellent — $10M of tax-free gain is a result most CPAs would celebrate. Maya's outcome, on identical economics, is roughly $3.57M better at the federal level, plus the state conformity tailwind in North Carolina.
Illustration only. Outcomes depend on basis, timing of gifts, the eligibility of each share lot, state of residence at sale, and the absence of any disqualifying redemption activity in the two years before and after issuance.
Frequently Asked Questions About QSBS Under OBBBA
When did the OBBBA changes to Section 1202 take effect?
The new $15 million per-issuer cap, the $75 million gross-asset ceiling, and the tiered 50/75/100% holding-period exclusions apply only to QSBS issued after July 4, 2025. Stock issued on or before July 4, 2025 remains under the pre-OBBBA rules ($10M cap, $50M asset ceiling, 5-year cliff at 100%).
Can I exchange old QSBS for new QSBS to get the better OBBBA terms?
No. The amended §1202(a) requires taxpayers to carry over the original acquisition date when QSBS is exchanged for other QSBS, including in §1045 rollovers and stock-for-stock transfers. There is no clean way to reset the issuance date and pull pre-OBBBA shares into the post-OBBBA regime.
Does my S-corp or LLC qualify for QSBS treatment?
No. QSBS must be issued by a domestic C-corporation. S-corps, LLCs, and partnerships are categorically ineligible. An S-corp can convert to a C-corp to start a fresh QSBS clock, but only stock issued after the conversion qualifies, and the gross-asset and active-business tests apply at and after issuance.
How does QSBS stacking with a non-grantor trust work?
The §1202 exclusion cap is per taxpayer per issuer. A non-grantor trust is a separate taxpayer with its own cap. By gifting QSBS to one or more non-grantor trusts well before any sale is contemplated, a founder can multiply the household exclusion — for example, $15M for the founder, $15M for a spouse who holds shares, plus $15M per non-grantor trust. Timing matters: gifts made after a sale process is in motion can be unwound by the IRS under assignment-of-income principles.
Which states do not honor the federal QSBS exclusion in 2026?
As of 2026, the principal non-conforming states are California, Pennsylvania, Alabama, and Mississippi. New Jersey, previously non-conforming, begins conforming for tax years starting January 1, 2026. North Carolina conforms, so North Carolina founders generally pay no state tax on federally excluded QSBS gain.
QSBS is the rare line item where seven figures of tax can be moved with a structural decision made years before the sale. After OBBBA, the dollar amounts are larger, the holding-period calculus is more flexible, and the stacking opportunity is wider. The tradeoff is that the planning has to happen before the LOI lands, not after.
If you are a founder with QSBS already issued, an S-corp owner weighing a C-corp conversion, or an investor evaluating a qualifying round, that is a conversation we have with our owner clients on a recurring basis.
This article is for educational purposes only and does not constitute individualized tax, legal, or investment advice. Tax law is current as of the 2026 tax year, reflecting the One Big Beautiful Bill Act (P.L. 119-21) signed July 4, 2025, and may change. State conformity rules vary and change frequently. Consult with a qualified advisor regarding your specific situation. Llewellyn Financial is a fee-only, fiduciary RIA based in Charlotte, NC.
