Case study: a founder's QSBS exit, mostly tax-free
Five years held, the qualified small business stock exclusion claimed, and a large chunk of the gain off the table. The win was set up at incorporation, not at the sale.
QSBS · Case studies
Can a founder really walk away from a multimillion-dollar sale and owe little to no federal tax on a big slice of the gain? Yes, if the stock was QSBS and the boring setup happened years earlier. This is a composite of how that plays out, with identifying details changed.
A composite, for illustration
This story is assembled from common patterns, not one real client. The figures are illustrative and the specific exclusion percentage, holding period, and cap are statutory values you must confirm before relying on them.
The setup nobody noticed at the time
Maya co-founded a software company. At incorporation she got founder stock in a U.S. C corporation, when the company was tiny and well under the gross-assets ceiling that QSBS requires. Her shares cost almost nothing.
Two unglamorous things happened in the first month. She got her stock at original issuance, directly from the company. And she filed an 83(b) election inside the 30-day window, paying tax on a value that rounded to lunch money. At the time none of it felt important. The company might have gone to zero.
The five-year wait
Confirm the stock qualified
Her counsel had structured the company as a C corp in a qualifying line of business, under the assets ceiling at issuance. The shares were eligible from the start.
Hold past the required period
QSBS rewards a multi-year hold. Maya kept her shares well past the required holding period, which had been running since she got the stock.
Keep the records
She held on to the grant documents, the 83(b) proof, and evidence of the company’s size at issuance. At the sale, those documents were what made the exclusion defensible.
Confirm the QSBS numbers with counsel
The QSBS rules changed in 2025, and the exact exclusion percentage, per-issuer cap, gross-assets ceiling, and holding-period tiers depend on when your stock was issued and your specific facts. Treat the figures here as directional, and confirm the current numbers with a tax professional before you rely on them.
The exit
The company was acquired. Maya’s stake was worth several million dollars, nearly all of it gain over her near-zero basis. Because the shares were QSBS and she had held long enough, a large portion of that gain was excluded from federal capital gains tax. The tax she avoided was not a clever year-end trick. It was the payoff for two things she did in the first 30 days and one thing she did over five years.
The second-order lesson
Here is what makes this case worth studying. The founder sitting next to Maya at a similar company got similar stock and a similar exit, and owed full freight. He had bought some of his shares from a departing co-founder instead of getting them all at original issuance, and he had never confirmed the company’s status at the time. Same outcome on paper, very different tax bill, decided by paperwork nobody thought about when the equity felt worthless.
What if she had needed the gain spread across her family?
That is where stacking comes in. Because the cap is per taxpayer per company, founders who expect a gain larger than one person’s limit sometimes gift QSBS to family members or non-grantor trusts well before a sale, so each gets a separate cap. It is powerful and easy to botch, and it only works with years of lead time.
What this means for you
If you hold founder shares, the lesson is not “wait and hope.” It is “set it up now and document everything.” Confirm the stock can qualify, file the 83(b) on time, start and track the holding clock, and keep the records you will need at the end. The exclusion is one of the largest in the code, and it rewards the founder who did the dull work early. When the potential gain is this large, a fit check before you sell is the cheapest move you will make.
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