Looks like they're coining a new legal term "Capital Growth Tax", under which they are going to tax unrealized capital gains. I'm not aware of any other country that taxes them like that (besides wealth/exit taxes), so maybe they're the world's first here!
Some countries have wealth taxes - but they are usually flat or scale with wealth, not the yearly increase in wealth. Note that currently NL does de facto have a wealth tax in Box 3 system - shares are presumed to have a fictional fixed yield of around 5-6% per year on which they charge you income tax, so it works out to about 2% wealth tax.
For real estate, yes, but it's a quite different type of asset with a stable value that (mostly) only goes up.
What about stocks or crypto (the assets this new law targets)? They can have wild value fluctuations in a year. If your crypto or startup's options have +1M paper gain this year and turn worthless the next year, is it fair to ask people to cough up some 300-500k of real cash in tax?
Some countries have wealth taxes - but they are usually flat or scale with wealth, not the yearly increase in wealth. Note that currently NL does de facto have a wealth tax in Box 3 system - shares are presumed to have a fictional fixed yield of around 5-6% per year on which they charge you income tax, so it works out to about 2% wealth tax.