Qualified small business stock

What is it?

Qualified small business stock, or QSBS, lets a holder exclude gain on the sale of stock in a qualifying C-corporation from federal income tax. To qualify, the stock must be issued by a domestic C-corporation that uses substantially all its assets in an active trade or business, the corporation's gross assets must stay under a ceiling at and around the time the stock is issued, and the holder must acquire the stock at original issue and hold it for a required period.

The active-business requirement excludes certain fields. Businesses whose principal asset is the reputation or skill of their employees — professional services and similar specified service trades — do not qualify, which is why the provision fits product and technology companies far better than service firms.

For stock issued after July 4, 2025, the One Big Beautiful Bill Act created a tiered exclusion that grows with the holding period, a higher per-issuer cap on the excludable gain, and a higher gross-asset ceiling for qualifying corporations. Stock issued on or before that date keeps the prior rules. Both regimes can therefore sit on the same capitalization table at once, and which rules apply to a given block of shares depends on when those shares were issued.

Because eligibility is fixed at issuance — the entity form, the asset level, and the nature of the business all tested then — QSBS is planned in year one or not at all. Founders who incorporate as a C-corporation early, while assets are still low, preserve the option; those who wait, or who start as an S-corporation or LLC, often forfeit it for shares issued later.

Who does it apply to?

Technology and product founders who incorporate as a C-corporation early, while the company's assets are still below the ceiling.

Early investors and employees who acquire qualifying stock at original issue and can hold it for the required period.

Companies planning a future sale or exit where founders and early holders want the gain on their shares to qualify for exclusion.

Who does it not work for?

• S-corporations and LLCs — the provision requires stock in a C-corporation, so entities taxed otherwise do not produce qualifying stock.
• Specified service businesses whose principal asset is the reputation or skill of their people, which are excluded from the active-business requirement.
• Stock sold before the required holding period is met, which does not qualify for the exclusion no matter how the company is structured.
• Shares acquired other than at original issue, or issued when the corporation's gross assets already exceeded the ceiling.

What does the IRS look at?

• Whether the issuer was a domestic C-corporation both when the stock was issued and throughout the required holding period.
• Whether the corporation met the active-business requirement and was not a disqualified specified service business.
• Whether the corporation's gross assets stayed under the applicable ceiling at and around the time the stock was issued.
• Whether the holder acquired the stock at original issue and satisfied the required holding period before selling.
• Whether the correct regime — pre- or post-July 4, 2025 — was applied to each block of shares based on its issuance date.

What does it cost to fund, and when does the window close?

There is no funding cost to the exclusion itself, but qualifying often means choosing a C-corporation from the start, which carries its own entity-level tax and administration. The real cost is the planning: getting the structure right at formation and documenting the corporation's assets and activity so eligibility can be proven years later at sale.

The professional work is a CPA and a startup attorney at formation, confirming the C-corporation structure, the gross-assets position, and the active-business qualification, then maintaining records through the holding period. Because eligibility is set when shares are issued, this belongs in year-one planning; there is no deadline to elect at sale, but there is no way to fix it after the fact either.

Related strategies

• §1361–1379Choosing and changing your business entityNo outlay
• §199AThe qualified business income deductionNo outlay
• §41The research and development creditNo outlay

Common questions

Can my LLC or S-corporation stock qualify?

No. Section 1202 applies only to stock in a domestic C-corporation, so an interest in an LLC and shares of an S-corporation do not qualify. Converting to a C-corporation later can start eligibility for shares issued after the conversion, but it does not retroactively qualify interests held before it, and the gross-assets ceiling is then tested at that later issuance, when the company may already be too large. Founders who want this treatment generally need the C-corporation in place when the shares are first issued, which is a formation decision made with a startup attorney and a CPA.

Why does the issuance date matter so much now?

The One Big Beautiful Bill Act changed the rules for stock issued after July 4, 2025, introducing a tiered exclusion that grows with the holding period, a higher per-issuer cap on excludable gain, and a higher gross-asset ceiling for qualifying corporations. Stock issued on or before that date remains under the prior rules, including their single longer holding period. Because both regimes can sit on the same capitalization table, the analysis is done block by block using each block's issuance date. Keeping the stock ledger and the corporation's asset records organized by issuance date is what makes that analysis possible at sale.

What kinds of businesses are excluded?

A corporation fails the active-business requirement if its principal asset is the reputation or skill of its employees, which excludes specified service trades such as health, law, accounting, consulting, performing arts, and athletics. The statute also excludes banking, insurance, financing and investing businesses, farming, extractive businesses subject to depletion, and the operation of a hotel, motel, or restaurant. The provision is aimed at product and technology companies that build value in assets beyond their people. Because the test looks at the nature of the trade rather than its label, confirm qualification at formation rather than at sale.

Mena Hemaia, CPA, CIA

Chief Executive Officer, Accountack — West Palm Beach, Florida

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