Section 1202 QSBS requirements: C-Corporation • Stock held ≥5 years for a 100% exclusion (50% at 3, 75% at 4 for stock issued after July 4, 2025) • Gross assets ≤$75M at issuance • Active qualified trade or business • Exclusion capped at the greater of $15M or 10× adjusted basis. See IRS Publication 550 for full eligibility criteria.
Business & Sale Details
Your original investment or capitalized cost in the business.
Annual taxable income at the entity level. As an S-Corp this has no entity tax; as a C-Corp it is taxed at the corporate rate.
Tax Rates
20% federal long-term capital gains + 3.8% NIIT = 23.8%
QSBS §1202 Parameters
The greater of $15M or 10× your adjusted basis. This tool calculates the effective cap automatically.
100% for stock acquired after 9/27/2010. Earlier vintages may be 50% or 75%.
Scenario A: Sell as S-Corp / LLC
Entity-Level Tax During Operations
Exit Tax
Scenario B: Convert to C-Corp & QSBS Exit
C-Corp Tax Drag (5 Years)
§1202 QSBS Exclusion at Exit
The Bottom Line
The QSBS path saves $421,650 after accounting for the C-Corp tax drag.
Even after paying $787,500 in cumulative corporate tax over 5 years, the Section 1202 exclusion saves $1,209,150 at exit — a net benefit of $421,650.
Breakeven Analysis
Breakeven: 7.7 years
If you operate as a C-Corp for more than 7.7 years before sale, the cumulative corporate tax drag will exceed the QSBS exit tax savings. The conversion is most beneficial when the sale occurs as close to the 5-year minimum as possible.
Accountant’s Note
Businesses can — and routinely do — maintain two sets of books: one prepared under GAAP (or managerial accounting standards) for internal control, performance evaluation, and lender reporting, and a second prepared under the Internal Revenue Code for tax purposes. The two will often diverge on items like depreciation schedules, revenue recognition timing, and inventory valuation. When modeling a C-Corp conversion, it is the tax books that determine the corporate tax liability shown above. A qualified CPA can help you understand how your specific book-to-tax differences would affect the actual drag.
What is Section 1202 QSBS?
Section 1202 of the Internal Revenue Code provides a powerful incentive for investors in qualified small businesses: up to 100% of the capital gain from the sale of Qualified Small Business Stock (QSBS) can be excluded from federal income tax. To qualify, the stock must be in a domestic C-Corporation with gross assets of no more than $75 million ($50 million for stock issued on or before July 4, 2025) at the time of issuance, the corporation must be engaged in an active qualified trade or business, and the stock must be held for at least five years. The exclusion is capped at the greater of $15 million or 10 times the adjusted basis in the stock. For business owners currently operating as S-Corps or LLCs, converting to a C-Corp can unlock this benefit — but at the cost of entity-level taxation during the holding period.
Key Considerations
5-Year Holding Period
The QSBS 5-year clock starts when the C-Corp stock is issued, not when the original entity was formed. A conversion from S-Corp or LLC resets the clock. Planning the conversion well in advance of a potential sale is essential.
$75 Million Gross Asset Limit
The corporation’s aggregate gross assets must not exceed $75 million ($50 million for stock issued on or before July 4, 2025) at the time the stock is issued and immediately after. If your business is growing rapidly, timing the conversion before this threshold is critical.
State Tax Conformity Varies
Not all states conform to the federal Section 1202 exclusion. Some states (like California) do not recognize the exclusion and will tax the gain at the full state rate regardless. Check your state’s conformity before relying on this strategy.
Qualified Trade or Business
Certain industries are excluded from QSBS treatment, including professional services (law, accounting, consulting, financial services, medicine), banking, insurance, farming, and hospitality. The business must be an active qualified trade or business.
C-Corp Tax Drag Is Real
Unlike an S-Corp or LLC, a C-Corp pays 21% federal tax on all operating income before distributions. This is cash that would otherwise be available to the owner. The longer you operate as a C-Corp, the more drag accumulates — eventually eliminating the QSBS benefit entirely.
Basis Stacking for Spouses
Each taxpayer can claim the $15M (or 10× basis) exclusion separately. For married co-founders or shareholders, this can effectively double the exclusion to $30 million. Proper planning with a qualified tax advisor is essential to structure ownership correctly.
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