US C-Corp Section 1202 QSBS: $10M Tax Exclusion

For founders of US C-corporations who hold their stock for at least five years, Internal Revenue Code (IRC) §1202 offers one of the most generous federal tax benefits in the entire Code: an exclusion from federal capital gains tax of up to USD 10 million (or 10× the basis in the stock, whichever is greater) on qualifying sales. This is the Qualified Small Business Stock (QSBS) exclusion. It is the single biggest reason VC-bound founders form Delaware C-corps from day 1 rather than starting as an LLC and converting later.

This deep-dive walks through the §1202 requirements, the five-year holding period, the corporate-side conditions, the per-issuer cap, and the practical workflow that ensures founders preserve QSBS qualification.

The IRC §1202 text and IRS guidance are at:

• https://www.law.cornell.edu/uscode/text/26/1202
• https://www.irs.gov/

1. The Headline Benefit

Under IRC §1202(a) and (b), a non-corporate taxpayer who holds Qualified Small Business Stock for more than 5 years may exclude from gross income 100% of the gain on the sale (subject to the per-issuer cap), provided certain conditions are met.

The exclusion applies to:

• Federal income tax — full exclusion;
• Federal alternative minimum tax — currently no AMT addback for 100% exclusion stock;
• Net Investment Income Tax (3.8%) — excluded gain is not subject to NIIT.

State income tax conformity varies by state. California, for example, does not conform to §1202 — California taxes the gain at the regular state rate. Massachusetts, New Jersey, Pennsylvania, and a few other states also have non-conformity issues. Most states conform.

2. The Per-Issuer Cap

Under IRC §1202(b)(1), the maximum gain excludable for any single issuer of QSBS is the greater of:

• USD 10 million, reduced by gain previously excluded for the same issuer; or
• 10 times the aggregate adjusted basis of the QSBS issued by the same issuer.

For most founder fact patterns — founder pays nominal amount for stock at incorporation, e.g., USD 100 of basis — the USD 10 million cap dominates. The 10× multiplier matters more for founders or investors who paid significant cash for stock (USD 2 million in basis × 10 = USD 20 million cap).

The cap is per issuer, not per founder per year. A founder with stock in two different qualifying issuers can potentially exclude up to USD 20 million (USD 10 million from each).

3. Eligibility — The Five Conditions

To qualify as QSBS, the stock must satisfy five conditions. Failing any one disqualifies the stock.

Condition 1 — C-Corporation Issuer

Under IRC §1202(c)(1)(A), the issuer must be a C-corporation at the time of issuance and during substantially all of the holding period. LLCs do not qualify. S-corps do not qualify.

This is the bright-line rule that drives founders toward C-corp formation at day 1. Converting an LLC to a C-corp later may reset the 5-year clock and may not qualify the prior gain — practitioners debate the precise treatment of conversion gain, and the IRS has not issued clear guidance. The safe assumption is that conversion does not preserve QSBS status for pre-conversion gain.

Condition 2 — Original Issuance

Under IRC §1202(c)(1)(B), the stock must be acquired by the taxpayer at its original issue in exchange for money, property (other than stock), or services. This means:

• Purchasing existing stock from another shareholder does not qualify (no QSBS for secondary purchases);
• Receiving stock as compensation (founder shares, stock options exercised) does qualify;
• Conversion from convertible debt or SAFEs generally does qualify, with care.

Condition 3 — Active Business Requirement

Under IRC §1202(e), the corporation must use at least 80% of its assets (by value) in the active conduct of a qualified trade or business during substantially all of the holding period.

Excluded businesses (do not qualify) include:

• Service businesses where the principal asset is the reputation or skill of employees (law, accounting, consulting, financial services, brokerage);
• Banking, insurance, financing, leasing, investing;
• Farming;
• Production of oil, gas, or natural resources;
• Hotels, motels, restaurants.

Most tech, SaaS, manufacturing, biotech, and product-based businesses qualify. Pure consulting and professional service businesses generally do not.

Condition 4 — Aggregate Gross Assets ≤ USD 50 Million

Under IRC §1202(d), at the time of issuance and immediately after, the issuing corporation’s aggregate gross assets must not exceed USD 50 million.

Aggregate gross assets includes cash and the adjusted basis of other property held by the corporation. For a startup raising a USD 50 million round, the test is applied immediately after the issuance — so a corporation can issue stock to investors and immediately have, say, USD 49 million in cash and still qualify.

After the gross assets exceed USD 50 million, future stock issuances lose QSBS qualification, but stock previously issued retains its QSBS status (the corporation does not “lose” already-qualified stock by growing past the threshold).

Condition 5 — Holding Period

Under IRC §1202(a), the taxpayer must hold the stock for more than 5 years before sale or exchange.

For founder stock issued at incorporation, the holding period starts on the issuance date. For stock acquired through option exercise, the holding period starts on the exercise date (not the option grant date). For stock acquired by gift, the recipient may “tack” the donor’s holding period under IRC §1223.

4. Critical Practical Issues

4-1. Filing Section 83(b) Election Within 30 Days

For founder stock subject to vesting, the founder should file an IRC §83(b) election with the IRS within 30 days of issuance. This election treats the stock as if fully vested for tax purposes, paying tax now on the (typically nominal) value. Without the election:

• The QSBS holding period starts only as each tranche vests — not at issuance — extending the time before §1202 qualifies the gain.
• Ordinary income tax is paid on the value of vesting tranches as they vest, which can be very expensive at later valuations.

The 83(b) election is a one-page form mailed to the IRS within 30 days. Missing the deadline is non-curable. IRS information on §83 and elections:

• https://www.irs.gov/

4-2. QSBS Through Convertible Securities

Stock received on conversion of:

• Convertible notes — qualifies if the conversion is treated as an “exchange” for QSBS rather than a separate purchase;
• SAFEs (Simple Agreements for Future Equity) — generally qualifies, with the holding period starting on issuance of the underlying stock at the conversion event;
• Preferred stock conversions — qualifies.

Practitioners maintain detailed cap-table records showing the chain of issuance to support QSBS claims years later.

4-3. Stock Buybacks

Under IRC §1202(c)(3), if the issuing corporation redeems more than a de minimis amount of stock from the taxpayer or related persons within a defined window (generally two years before to two years after issuance), the stock issued may be disqualified.

For founders, the practical implication is to avoid corporate stock repurchases of founder stock in the four-year window around new issuances. Stock repurchases for valid business purposes (tax withholding, departing founder, etc.) require careful structuring.

4-4. Reorganisations and Continuation

QSBS treatment carries through certain tax-free reorganisations under IRC §368, with adjustments. Acquisitions for stock of a public acquirer can preserve QSBS treatment in some cases.

5. The §1045 Rollover

If a founder sells QSBS before holding for 5 years, IRC §1045 allows a tax-free rollover into other QSBS within 60 days of the sale. The replacement stock must also satisfy §1202 conditions. The rolled-over basis carries to the new stock, and the holding period tacks. Sophisticated founders use §1045 to remain in the QSBS regime when an early acquisition forces them out of the original company before the 5-year point.

6. Workflow for a New C-Corp

1. Form Delaware C-corp under DGCL §102 — not LLC, not S-corp.
2. Issue founder stock at par or near-par — establishes nominal basis.
3. File §83(b) election within 30 days of issuance — start the QSBS clock from issuance, not from vesting.
4. Maintain corporate records — articles, bylaws, minutes, share register, all updates filed.
5. Track aggregate gross assets — confirm USD 50 million test at each new issuance.
6. Maintain active business — confirm 80% asset test at each fiscal year.
7. Calendar the 5-year mark — most founder stock matures into full QSBS at year 5.
8. Coordinate with sale — at exit, the §1202 exclusion is claimed on the founder’s personal Form 1040 via Form 8949 with proper QSBS designation.

7. State Tax Conformity Quick Reference

A California-resident founder selling QSBS still pays California state tax (top rate ~13.3%) on the gain even though federal tax is zero.

8. Why §1202 Drives Day-1 C-Corp Formation

For a founder uncertain whether their startup will need VC, the calculus is:

• Form C-corp on day 1: pay USD 200 + filing + small franchise tax. Lock in QSBS clock.
• Form LLC on day 1, convert to C-corp at Series A: save franchise tax for early years, but lose QSBS on pre-conversion gain and reset the 5-year clock.

For startups with high realistic upside, the QSBS preservation case for day-1 C-corp is compelling. For pure cash-flow businesses with no IPO or acquisition realistic, the LLC path may be more efficient.

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Disclaimer

Legal information, not legal advice. MmowW Scrib🐮 is operated by a licensed Gyoseishoshi (行政書士) office in Japan. We are not US attorneys, CPAs, or members of any state bar. For US tax planning, retain an attorney or CPA admitted in your state.

Sources

1. Cornell LII — IRC §1202 — https://www.law.cornell.edu/uscode/text/26/1202
2. IRS — https://www.irs.gov/
3. IRS — Form SS-4 — https://www.irs.gov/forms-pubs/about-form-ss-4
4. Cornell LII — IRC §1361 (S-Corp eligibility) — https://www.law.cornell.edu/uscode/text/26/1361