Qualified Small Business Stock (QSBS)

Qualified Small Business Stock, or QSBS, refers to shares in a domestic C-corporation that meets a set of conditions defined in the federal tax code. When a shareholder holds qualifying QSBS for more than five years and all requirements are satisfied, a significant exclusion of capital gain may be available upon sale. The maximum exclusion percentage and the per-issuer gain cap are set by law and change; current figures should be verified with a qualified attorney or CPA.

QSBS matters enormously to founders, early employees, and angel investors in startup companies. A hypothetical founder who receives stock at a company's formation and later sells after a decade could potentially exclude a large portion of the gain from federal tax—a benefit that can represent millions of dollars on an illustrative exit of, say, $20 million to $50 million in gain. The rules are strict: the corporation must have been a C-corp when the stock was issued, gross assets at issuance must fall below a statutory ceiling, and the business must operate in an eligible industry.

QSBS intersects with concentrated stock positions and is sometimes a factor in decisions about whether to convert an LLC to a C-corp before a funding round. A common confusion is assuming that QSBS treatment is automatic; it must be confirmed that both the issuer and the stock issuance met every requirement at the time of grant, not only at sale. State tax treatment of QSBS exclusions varies widely, and a qualified professional must evaluate eligibility in any specific case.