Qualified Small Business Stock (QSBS): The IRC 1202 Gain Exclusion

By Yarik Yarosh, CPA ·September 5, 2026 ·4 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

IRC 1202 is the most valuable tax provision for founders and early-stage business owners, and the least known. It allows a shareholder to exclude up to $10 million of capital gain (or 10x their basis in the stock, whichever is greater) from federal income tax when selling qualified small business stock (QSBS). For stock acquired after September 27, 2010, the exclusion is 100%. That means zero federal capital gains tax on up to $10 million of gain. The provision is only available for C-Corporations, which is one reason tax planning before entity formation matters so much.

✓Key takeaway

QSBS requirements (all must be met):

1. C-Corporation stock:

The stock must be in a domestic C-Corporation
S-Corps, LLCs, and partnerships do NOT qualify
The C-Corp can convert to an S-Corp later, but the stock must have been C-Corp stock when acquired

2. Original issuance:

The shareholder must have acquired the stock at original issuance (directly from the corporation)
Not purchased on the secondary market
Stock received in exchange for cash, property, or services (including sweat equity)
Stock options count if exercised and held (the holding period starts at exercise)

3. Gross assets under $50 million:

At the time the stock was issued, and immediately after, the corporation’s gross assets (total value of money and property) must not exceed $50 million
This is measured at the time of issuance, not at the time of sale
If the company grows past $50 million later, the stock issued when it was under $50 million still qualifies

4. Active business requirement:

At least 80% of the corporation’s assets must be used in the active conduct of a qualified trade or business
Excluded businesses (do NOT qualify): health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage, and any business where the principal asset is the reputation or skill of employees
Qualifying businesses: technology, manufacturing, retail, wholesale, restaurants, construction, and most non-service businesses
SaaS and technology companies generally qualify

5. Holding period: 5+ years:

The shareholder must hold the stock for at least 5 years
If sold before 5 years: no exclusion (but IRC 1045 allows a tax-free rollover into another QSBS within 60 days, resetting the holding period)

Exclusion amount:

The greater of: $10 million, OR 10x the shareholder’s adjusted basis in the stock
Per shareholder (married couple filing jointly: $10 million each = $20 million if both own stock)
Each shareholder’s exclusion is independent

Federal tax savings:

$10 million gain x 0% = $0 federal tax
Without QSBS: $10 million x 23.8% (20% capital gains + 3.8% NIIT) = $2,380,000
QSBS saves $2,380,000 in federal tax on a $10 million exit

State treatment varies:

Some states (like California since 2013) do not conform to the federal QSBS exclusion
Other states fully conform
State tax planning around QSBS is essential

How does QSBS planning work in practice?

Hypothetical example

Round numbers. A founder starts a technology company as a C-Corporation. Incorporates in Delaware. Invests $50,000 in cash for 100% of the stock. Gross assets at issuance: $50,000 (well under $50 million). The company grows over 7 years and is acquired for $8 million.

QSBS analysis:

C-Corporation: yes
Original issuance: yes (founder received stock at incorporation)
Gross assets at issuance: $50,000 (under $50 million)
Active business: technology (qualifying trade)
Holding period: 7 years (over 5 years)
All requirements met.

Tax calculation:

Sale price: $8,000,000
Basis in stock: $50,000
Capital gain: $7,950,000
QSBS exclusion (greater of $10 million or 10x basis = $500,000): $10 million
Gain excluded: $7,950,000 (entire gain, under the $10 million cap)
Federal capital gains tax: $0
NIIT: $0

Without QSBS:

Capital gains tax (20%): $1,590,000
NIIT (3.8%): $302,100
Total without QSBS: $1,892,100

QSBS saved $1,892,100 in federal tax.

Stacking with a spouse: If the founder gifts half the stock to their spouse before the sale (at least 2 years before to establish the holding period), each spouse has $3,975,000 in gain. Each spouse’s QSBS exclusion is $10 million. Both gains are fully excluded. This doubles the effective exclusion to $20 million for married couples.

The S-Corp mistake: If the same founder had formed an S-Corp instead of a C-Corp, the $7,950,000 gain would be taxable at capital gains rates. The S-Corp election would have saved maybe $30,000/year in self-employment tax along the way, but cost $1,892,100 at exit. For high-growth businesses with an exit plan, the C-Corp + QSBS structure is often dramatically better despite the double-taxation risk during operations.

Planning note: the QSBS exclusion only applies to the C-Corp period. If a company starts as an LLC (taxed as partnership) and later converts to a C-Corp, the 5-year holding period starts at the conversion date, and only stock issued as C-Corp stock qualifies. Planning the entity structure from day one is the cleanest path to QSBS eligibility.

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Qualified Small Business Stock (QSBS): The IRC 1202 Gain Exclusion." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-qsbs-irc-1202-exclusion

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.