Case study: a disqualifying ISO sale to diversify fast
Why one founder chose ordinary income over holding a single volatile stock for the lower rate.
ISOs · Case studies
When is paying a higher tax rate the smart move? When the lower rate forces you to keep a bet you would never make on purpose. Here is a composite of a founder who deliberately gave up the qualifying ISO rate to get out of a stock that had become his whole net worth.
Names and numbers are a composite. The reasoning is the point.
The setup
Marcus had exercised his incentive stock options and was holding the shares, waiting to clear the qualifying holding periods, two years from grant and one year from exercise, so the entire gain would be taxed at the long-term capital gains rate. On paper that is the textbook plan.
The problem was concentration. After a big up year, that single stock was something like 80% of his net worth. Selling later for the better rate meant staying undiversified in one volatile company for months more, hoping it held.
The hidden price of waiting for the rate
Holding for the qualifying rate is only free if the stock cooperates. The cost nobody prices is the risk you carry while you wait. A worse tax rate on a sale today can beat a better rate on a position that drops 40% before the clock runs out. I do not manage money for people who can live forever, and neither should the tax code.
The decision
Marcus chose a disqualifying disposition, selling before the holding periods were met. That throws out the ISO treatment and taxes the bargain element, the spread at exercise, as ordinary income instead of capital gain.
He priced the tax difference honestly
Selling early meant ordinary-income rates on the spread rather than the long-term rate. He treated that gap as the cost of the insurance, not as a loss to avoid at all costs.
He weighed it against the concentration risk
A real chance of a steep drop in a one-stock portfolio dwarfed the tax difference. The expected damage from staying concentrated was the bigger number.
The disqualifying sale also cleaned up the AMT
Because he had exercised and held, he was carrying an AMT preference on the spread. Selling in a disqualifying disposition unwinds that AMT exposure, so he was not fighting a phantom-income bill on top of the concentration risk. See what a disqualifying ISO sale does to your taxes.
He redeployed into a diversified portfolio
The after-tax proceeds went straight into a broad, liquid mix. The single-company risk was gone in one move.
Marcus was weighing his ordinary rate, up to 37% for 2026 on taxable income over $640,600 for single filers and $768,700 for married filing jointly 2026, against the long-term capital gains rate, which for 2026 is 0% on taxable income up to $98,900 (married filing jointly) and $49,450 (single), 15% up to $613,700 (married filing jointly) and $545,500 (single), and 20% above those 2026. The AMT he was unwinding turns on the exemption, which for 2026 is $140,200 for married filing jointly and $90,100 for single filers 2026, phasing out from $1,000,000 of AMT income for married filing jointly and $500,000 for single filers, and gone at $1,280,400 and $680,200 respectively 2026.
Why it was the right call
The tax tail was trying to wag the dog. The lower rate is real, but it is a discount on an outcome, and the outcome here was an undiversified bet Marcus would never have placed with cash.
So you should always sell early?
No. When the position is a reasonable slice of your net worth and the stock is not wildly volatile, holding for the qualifying rate is usually worth it. The disqualifying sale earns its keep in the specific case Marcus was in: dangerous concentration, real volatility, and a tax difference smaller than the downside he was carrying. The judgment is about risk first, rate second. See when to blow the ISO holding period on purpose.
What this means for you
A lower tax rate is not worth keeping a position that could cut your net worth in half. When one stock is most of what you own, the question is not how to tax the gain most cheaply, it is how to stop carrying a risk you would never take on purpose. Diversification is the goal; the tax rate is a cost you pay to reach it. For the broader trade, read planning your ISO exercise year. If a single stock has quietly become your whole net worth, a fit check is a good place to pressure-test the unwind.
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