Qualified Small Business Stock: The Exclusion Most Founders Have Never Heard Of

If you started a company, or you hold stock in one you helped build, there's a provision in the tax code that might matter more to you than almost anything else in your plan. It's Section 1202, and it covers what's known as Qualified Small Business Stock, or QSBS.

The short version. If you hold qualifying stock in a qualifying small business for more than five years, a significant portion of the gain when you sell it could be excluded from federal tax entirely. Not deferred. Excluded. That is rare enough in the tax code that it's worth repeating.

The catch is the word qualifying, twice. The stock has to meet specific requirements when it was issued, things like the company being a C corporation, the aggregate gross assets being under a certain threshold at the time of issuance, and the business operating in a qualifying trade or industry. The holding period has to be met too, and there isn't a shortcut around the five years.

Here's where it gets complicated and where most people find out too late. A lot of founders and early employees have no idea whether their stock actually qualifies, because nobody checked the box at the time the stock was issued. By the time a sale is on the table, it can be too late to fix structural issues retroactively. This is the kind of thing that needs to be looked at years before an exit, not during diligence.

It's also worth saying plainly that the exclusion amount and the specific rules have been adjusted by Congress more than once, and the rules that apply depend on when the stock was issued. What applied five years ago isn't necessarily what applies today. This is not a set it and forget it provision.

If you have equity in a company you helped start, or you're advising someone who does, the question worth asking isn't whether QSBS applies. It's whether anyone has actually confirmed it does, in writing, with the specific facts of your stock.