Selling private shares in a tender offer: taxes and mechanics
An engineer sold a slice of his startup stock in a tender offer before the IPO. Here is how the window worked, what it taxed, and how he decided how much to sell.
Hybrids & more · Case studies
Can you turn private startup stock into cash before the IPO, and what does it cost you? Yes, through a tender offer, and the tax depends entirely on what you are selling. I will walk through a composite I will call Marco, an early engineer who sold a slice of his shares in a company-run tender. The details are changed; the mechanics are real.
What was actually on the table
Marco had exercised his options years earlier, so he owned real shares, not just a grant. When the company ran a tender offer, an investor agreed to buy a fixed dollar amount of employee stock at a set price, and the company opened a window for eligible holders to sell into it.
This is the common path to early liquidity. Not a one-off secondary you go hunting for, but an organized window handed to you on the company’s terms. Marco could sell some shares, up to a cap, at a price he did not get to negotiate.
Caution
A tender offer is the company’s event, not yours. There is usually a per-person cap, a fixed price, and a hard deadline. You take the terms or you wait for the next one, which may never come. Read the offer documents and your stock agreement before you decide anything.
How the window worked
The company announced the offer and the price
A buyer committed to a set amount at a fixed per-share price. Eligible holders got documents and a window to opt in.
Marco chose how much to sell
There was a cap on his participation. He weighed cash today against the upside he would give up if the company kept climbing, and chose a number inside the limit.
The sale closed and the tax followed the shares
Because Marco was selling stock he already owned, the gain over his cost basis was a capital gain. How long he had held the shares decided whether it was the lower long-term rate or the higher short-term one.
The tax turned on one question: did he already own the stock?
This is the fork that catches people. Marco owned real shares, so his sale was a capital gain over basis. Someone else in the same tender, selling shares they had to exercise options to get, would face a very different bill.
What if you have to exercise options first to sell?
Then you stack two tax events. Exercising an NSO creates ordinary income on the spread right away. Exercising an ISO can trigger AMT. Only after that do you own shares to sell, and the sale itself adds its own capital gains math on top. Selling freshly exercised shares can also be a disqualifying disposition for ISOs, which turns the break into ordinary income. The person selling already-owned stock has a clean capital gain. The person exercising-to-sell has a layered bill.
Whether Marco’s gain was long-term or short-term turned on the holding period: hold the shares more than a year and the gain is long-term, a year or less and it is short-term, taxed as ordinary income. The long-term rate has its own breakpoints by income. For 2026 the long-term rates run 0% up to $98,900, 15% up to $613,700, and 20% above that for married filing jointly 2026, and 0% up to $49,450, 15% up to $545,500, and 20% above that for single filers 2026. A high-income sale can also draw the 3.8% net investment income tax once income clears $250,000 married filing jointly or $200,000 single 2026.
How much should he sell?
Here is the second-order question Marco almost skipped. The case for selling some was not greed, it was survival. His entire net worth was one private stock that had not gone public. A tender offer was a rare chance to take real risk off the table before a single company’s fate decided his.
The case against selling everything was the upside he would forfeit if the company soared. The honest answer sat in the middle: sell enough to be safe, keep enough to stay in the game. I do not manage money for people who can live forever, and a concentrated private position is exactly the bet that can unwind years of work if it breaks the wrong way.
Could selling early have hurt his QSBS treatment?
It can, and Marco checked. If the shares are QSBS, the exclusion rewards holding for the required period, and selling before he cleared it could forfeit a large federal tax break. Certain company redemptions around the time he got the stock can damage the qualification entirely. If QSBS might be in play, the holding clock has to be checked before joining any tender.
What this means for you
If a tender offer lands in your inbox, start with two questions before the price even matters: do I already own these shares or do I have to exercise first, and how much of my net worth is riding on this one company? The first decides your tax. The second decides how much you should sell. Liquidity in a private company is rare and worth using well. When a chunk of your wealth is on a single private stock, a fit check before you sell is the cheapest risk control you have. Marco sold enough to sleep and kept enough to dream. That is usually the right shape.
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