alt Hacker News> Taxing wealth is much harder on a practical and algorithmic level than taxing income.
I find this argument somewhat unconvincing. Where is most of the wealth? In hard assets, such as real estate and financial assets, such as stocks and bonds. The former are very difficult to hide, for obvious reasons. As for the latter, the ownership of every single share is recorded in large databases (e.g. DTCC, Clearstream and Euroclear). In that sense, the "physical location" of most of the wealth is well known, so in theory it should really not be difficult to tax it.
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Financial assets are extremely easy to hide. Set up an international chain of shell companies, foundations, and trusts, install a fake beneficial owner or trustee or two at various points, carve out deductibles for IP and "services", and the ownership becomes completely opaque.
And that's just the legal version.
I know someone who used to work as a business lawyer. She spent years trying to track down the true owners in various cases. At the very least it's an expensive business. And sometimes it just couldn't be done.
Of course governments can cut the knot with physical assets, walk into a building with troops and/or police, and say "This is ours now." Or they can order banks to hand over the money in accounts.
But before they can do that, there has to be some certainty about the owner. And even getting part way there can take a while and cost a lot.
But financial assets do not need physical space, so they can be tied to smaller countries which will be very happy to tax them at a lower rate so they can "steal them" from the original country where they were generated.
It really comes down to valuation.
The unit of account for tax is the currency of the relevant sovereign. Most contracts for income are denominated in that unit of account, even if it is not there is often a highly liquid market (FX) between units of account.
Most wealth is not stored in assets where the unit of account is that of the sovereign. This counts double for assets with a physical location.
This isn't something that can be easily hand-waived away.