zlacker

I think The Netherlands has it running quite OK.

You don’t need new govt. dept. tax authority is enough. You do your yearly tax statement.

In NL they have access to your bank accounts or more like banks and brokers are obliged to provide state of accounts as per 1st of January.

Downside is you pay wealth tax on „possible gains” not actual gains on wealth above 40k€. If you have mortgage it of course is deducted from value of your house or any debts that you have documented.

In case you think collecting watches can make you hide the wealth, there are of course tax authority checks most likely if your wealth suddenly changes.

>>ozim+(OP)
The Netherlands is an accountant's wet dream. Everyone with assets here has a personal double-layered corporate structure where the assets are held by the one company, but they're nominally employed by the second one. Even cars for every-day use can be business-owned and then leased back to yourself. And the corporate tax rate is nowhere near the personal wealth tax, people here don't even bother with registering their assets in foreign holdings.