QSBS (Qualified Small Business Stock)

Definition

Qualified Small Business Stock (QSBS) is a designation under Internal Revenue Code Section 1202 that permits a non-corporate holder of qualifying stock to exclude a substantial portion of federal capital gains tax on sale, provided certain holding-period and company-level tests are met.

For stock acquired after September 27, 2010, and held for at least five years, the exclusion is generally 100% of gain, capped at the greater of $10 million per taxpayer per issuer or 10 times the taxpayer’s basis in the stock.

QSBS is one of the most powerful tax provisions available to US founders and early employees of qualifying C corporations.

The five tests

For stock to qualify as QSBS:

1. Issuer form. Must be stock of a domestic C corporation (not an S corp, LLC, or partnership)
2. Aggregate gross assets. The issuer must have had aggregate gross assets of $50 million or less at all times before and immediately after issuance (increased to $75 million for stock issued after July 4, 2025 under OBBBA provisions — consult current guidance)
3. Qualified trade or business. The issuer must be in a qualified trade or business — most tech, biotech, and operating companies qualify; excluded sectors include financial services, farming, hotels, restaurants, law, accounting, consulting, health, and certain services
4. Original issuance. The stock must be acquired at original issue — directly from the company in exchange for cash, property (other than stock), or services. Stock bought on the secondary market generally does not qualify
5. Holding period. Five years of continuous holding before sale

Who QSBS benefits

In practice, QSBS is most valuable for:

• Founders of US C-corp startups exiting after year five
• Early employees with exercised stock (not just vested options)
• Early angel investors who purchased stock directly from the company
• Converted LLCs that properly convert to C-corps and hold post-conversion (the clock starts at conversion)

The stacking strategies

The $10M/10x cap is per taxpayer, per issuer. Two planning techniques routinely multiply the benefit:

• Spousal stacking — Gifting QSBS shares to a spouse creates a second $10M cap for the same family. Requires real separate-property treatment in non-community-property states.
• Trust stacking — Gifting QSBS to a non-grantor trust creates a separate taxpayer with its own $10M cap. Multiple trusts for multiple beneficiaries can multiply this further. This is where sophisticated estate planning meets income tax planning and is routinely used to convert a single $10M cap into $30M, $50M, or more of excluded gain.

Both strategies must be executed with real care around transfer timing, gift tax implications, and the “qualified small business” tests at the time of transfer. The five-year holding period tacks to transferees in most cases.

Section 1045 rollovers

If QSBS is sold before the five-year mark, gain can be rolled over tax-deferred under Section 1045 into other QSBS within 60 days. The holding period tacks, allowing a taxpayer to sell at year three and purchase replacement QSBS while preserving eventual Section 1202 treatment.

State conformity

Not all states conform to Section 1202. California does not — QSBS is fully taxable for California state tax purposes. Several other states have partial or no conformity. For high-state-tax founders, the state treatment may dominate the federal benefit, driving residency and trust-situs planning.

What QSBS is not

• Not available to corporate shareholders (C-corps cannot themselves hold QSBS and get 1202 treatment)
• Not available for stock bought on the secondary market
• Not available after liquidation if the company is an S-corp, LLC, or partnership
• Not a substitute for broader tax or estate planning — it is one tool in a larger workbench

Practical implications

Decisions made at incorporation (C-corp vs LLC), at early funding (taking stock rather than warrants), at option exercise (early exercise via 83(b)), and at trust and gift planning in the two to four years before a liquidity event materially determine how much QSBS benefit is available. Founders who plan with Section 1202 in mind from year one typically realize multiples of the benefit that reactive planners do.

Related on QP List

• Topics · Post-Liquidity Planning — the window where QSBS planning is most active
• Topics · Tax Strategy — broader tax-architecture context
• Topics · Concentrated Stock — related diversification strategies

Rules around QSBS change. Thresholds and exclusions may vary depending on acquisition date and current law. Nothing on this page is tax or legal advice. Consult a qualified advisor for specific situations.