Netherlands is €60,000 single / €120,000 married before it kicks in; implemented as a 36% yearly tax on assumed 6% returns (e.g. married; have €200k in investments; you owe something like [200-120] * .36 * .06 = €1728). I think there's some nuance for bad years.

In practice its basically an additional 2% "drag" on market returns as its a yearly tax; not capital gains on sale.

Sole reason we turned down a job there. I don't hate the idea of a wealth tax, but having it kick in at €120,000 is nuts. IMO it's not even functioning as a wealth tax, its a barrier to the middle class accumulating even meager non-property wealth.

(I'm sure I have some details wrong, but broad-strokes this is what I remember from when we turned it down a few months ago)