Qualified Small Business Stock (QSBS) can offer one of the most significant tax benefits available to founders, investors, and early-stage company shareholders but only if strict eligibility requirements are met. From entity structure and asset thresholds to holding periods and business activity tests, a single mistake can jeopardize the potential capital gains exclusion. In this article, Christopher Klug outlines the key QSBS rules, common pitfalls, and planning considerations to help businesses and investors maximize this valuable tax opportunity.