Earlier quoted context omitted.
They're getting capital gains any time they sell a stock for more than they paid. There's no magic threshhold of $500k.
>There's no magic threshhold of $500k. In the US in 2021 (aka, right now) the magic threshold for capital gains is $445,850-$501,600 depending on filing status. So you're technically correct that $500k isn't a magic threshold, but it's certainly in the middle of it. But more importantly, you're going down a technical rabbithole. The point of this comment chain is "what happens to people experiencing a one-time windfa…
No, its not.
The transition point between the top (20%) and middle (15%; the bottom is zero) marginal rate of long-term capital gains rates are either exactly the top or bottom of that range for 3 of 4 tax filing statuses (you left off married filing separately, which is much lower than even the low end), but that’s not a “magic threshold” by any reasonable definition.