QSBS Requirements Explained

Published 2026-07-07 · Optimist Tax Advisors

Qualified small business stock (QSBS) status is a checklist, and every item on it matters. Stock either qualifies or it does not, and the difference on a large exit is measured in millions. The requirements, in the order they usually get checked:

1. A domestic C corporation

The issuer must be a U.S. C corporation when the stock is issued and for substantially all of your holding period. Stock in an LLC or S corporation does not qualify, though an LLC that converts to a C corporation can issue qualifying stock from the conversion forward.

2. Original issuance

You must acquire the stock directly from the company, for money, property, or services. Stock bought from another shareholder on a secondary basis does not qualify. Gifts and inheritances of QSBS keep their status; purchases do not.

3. The gross asset test

The company's gross assets must not exceed $75M at or immediately after issuance (for stock issued after July 4, 2025; the prior threshold was $50M). This is measured at issuance, so later growth does not disqualify earlier stock. It does mean each financing round needs its own analysis: early rounds may qualify while later rounds fail.

4. The active business test

At least 80% of the company's assets must be used in a qualified trade or business for substantially all of your holding period. Excluded businesses include most professional services (law, health, accounting, consulting, financial services), banking, farming, hotels, and restaurants. Most technology and product companies qualify.

5. The holding period

For stock issued after July 4, 2025: a 50% exclusion at three years, 75% at four, and 100% at five. For earlier stock: 100% requires five years (for stock acquired after September 27, 2010), with no partial credit for shorter holds. The clock starts at issuance, or at exercise for options; an 83(b) election on restricted stock starts it at grant.

The cap

The exclusion is limited per issuer, per taxpayer: the greater of $15M (post-2025 stock; $10M for earlier stock) or 10 times your basis. The 10x basis prong is why investors who paid meaningful cash for shares can sometimes exclude far more than the headline cap.

Documentation matters as much as the rules: issuance records, asset-level balance sheets near each issuance date, and the company's business classification should be gathered while the company is alive and cooperative, not reconstructed at exit.