Qualified Small Business Stock (QSBS) Basics: Section 1202 for Founders and Early Investors

Section 1202, commonly called the QSBS exclusion, is one of the few provisions that can eliminate federal tax on a large gain from selling stock. It is also narrow, technical, and frequently misunderstood. This article gives a general overview, and because the rules were changed by recent legislation, everything here should be verified against current law before you rely on it.

The concept

If you hold qualified small business stock issued by a domestic C-corporation, for a required period, you may be able to exclude a portion (in some cases all) of the gain when you sell the stock, up to a per-taxpayer, per-issuer limit. The policy goal is to encourage investment in small companies.

Who and what qualifies (general terms)

The stock must be:

Stock of a domestic C-corporation. LLCs taxed as partnerships and S-corps do not issue QSBS, though an LLC can convert to a C-corp to begin qualification.
Originally issued to the taxpayer (acquired at original issuance for money, property, or services), not bought from another shareholder on a secondary market, with limited exceptions such as gifts and inheritance.
Held for the minimum holding period.

The company must meet requirements:

It is a C-corporation during substantially all of the holding period.
Its aggregate gross assets do not exceed a threshold at the time of and immediately after issuance (historically $50 million, and raised by recent legislation for stock issued after a stated date in 2025).
It uses at least 80 percent of its assets in the active conduct of one or more qualified trades or businesses.
It is not in an excluded field. Excluded businesses include many personal service fields (health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage), banking, insurance, farming, mining, and hotels and restaurants, among others. Technology and product businesses are commonly eligible, but classification is fact-specific.
Certain redemption rules are not violated.

The exclusion

Under long-standing rules for stock acquired after September 27, 2010, and held more than five years, the exclusion could be 100 percent of the gain, up to the greater of $10 million or ten times the taxpayer's basis in the stock, per issuer. Recent legislation in 2025 modified the rules for stock issued after a specified date, including tiered exclusions for holding periods shorter than five years (for example, three and four years), and a higher dollar cap for stock issued after that date. Because these changes are recent and detailed, confirm current numbers, dates, and mechanics with a professional.

Any gain that is not excluded is taxed under normal capital gain rules. State taxes may not follow the federal exclusion. Some states do not conform.

Planning points

Entity choice at formation. A founder who plans to sell the company or expects significant appreciation and qualifies for QSBS may prefer a C-corporation from the start. Compare with pass-through treatment. See C-corps for small business.
Conversions. An existing LLC that converts to a C-corp begins the QSBS clock at conversion, and the basis for purposes of the exclusion may be the fair market value at conversion, which can affect the per-issuer limit. Detailed rules apply. Valuation at conversion matters. See changing entity type.
Holding period. Keep track of issuance dates and any events that could disrupt qualification, such as redemptions of stock from shareholders or related parties near the issuance date.
Per-issuer limit multiplication. Some planning uses gifts of stock to family members or trusts to multiply the number of taxpayers eligible for the exclusion. This is an advanced strategy that requires legal and tax counsel.
Rollover of gain. Section 1045 allows a rollover of QSBS gain into new QSBS within 60 days for stock held more than six months, deferring gain. Rules are technical.
Active business requirement. Companies that hold significant investments or real estate may fail the 80 percent test.
Documentation. Keep records of the company's asset values at issuance, the business activities, stock issuance documents, and any representations. Companies sometimes give shareholders a QSBS certification, but it does not guarantee eligibility.

Risks and cautions

Double taxation without the benefit. If the stock does not qualify, a C-corp structure can be more costly than a pass-through.
Alternative minimum tax and state tax may apply differently.
Compensation and redemption rules can limit qualification.
Anti-abuse rules and IRS scrutiny for aggressive planning.
Complexity and change. The rules are changing, and future legislation could change them again.
Not for service businesses in excluded fields. Many small businesses cannot qualify.
The exclusion applies to gain on the sale of stock, not to salary or dividends.

Interaction with other planning

Reasonable compensation: C-corp owners paid salary get ordinary income treatment on wages. Founders aiming for QSBS often keep salary moderate but reasonable.
Exit structure: the exclusion applies to stock sales. Asset sales by the corporation do not qualify for the shareholder-level exclusion, and can trigger corporate tax. See buying a business: asset vs stock.
Qualified plan and benefits: unaffected.
Estate planning: basis step-up at death could affect QSBS holding and exclusion, so plan with counsel.

Common mistakes

Assuming an LLC or S-corp can issue QSBS.
Assuming any business qualifies, without checking the excluded fields list.
Ignoring the gross assets test.
Buying stock from another shareholder and assuming it qualifies.
Failing to document.
Not accounting for state tax.
Making entity choice decisions based only on QSBS potential without evaluating the business realities.
Relying on outdated summaries given the 2025 changes.

Should you plan around it?

If you are forming a company you expect to grow and sell, and it is not in an excluded field, ask your adviser about QSBS at the outset. If you run a stable, owner-operated service business, QSBS is unlikely to apply, and a pass-through structure will typically fit better. See LLC vs S-corp vs C-corp.

For help evaluating whether QSBS planning could fit your situation, AE Tax Advisors can assist, and a discovery call is a good first step. Complex securities and tax issues should be reviewed with counsel.