Wealth tax is a terrible idea. People think it will solve the problem with billionaires taking out loans collateralized with their stock and not paying income tax, but the solution for that is far simpler - just treat loans as income. You can even add an exception for an owner occupied mortgage if you want to keep encouraging forced savings into property. We have existing solutions that don't have the massive disincentives a wealth tax would create.

A wealth tax actually discourages investment through stocks, which is what keeps the economy moving (and before anyone says publicly traded companies thinking about short term profits is destructive, that's a separate, but serious, issue). Worse, it discourages savings of any kind. The problem with saying "oh we'll just start it only a billion dollars" or whatever is that allows for later expansion of the tax to 100 millionaires, 20 million, and boom suddenly you're taxing people with 5 million dollars which is what you'd expect a middle class elderly couple from a high cost of living area to have squirreled away for retirement. And if you don't think that would happen, you should look at the history of the income tax - because that's exactly what happened.

Also, a wealth tax is really hard to enforce, and would require a huge increase to the administrative state that itself would create a need for more taxes. That's not inherently a problem (obviously we have legions of IRS agents, etc) but we already have that infrastructure set up for income taxes and are just underutilizing it. Take how many lawsuits and hearings we already have JUST with tax assessors for property, and then try adding that to cars, boats, art, luxury clothes, appliances, privately held companies, anywhere you can hide money or that has a questionable value. It's a boondoggle we don't need to mess with when all we have to do is just reclassify collateralized debt as income because it is functionally the same as selling something.

I like taxes. I even like my high taxes because I know they pay for good services since I live in a blue state. But a wealth tax is a bad idea when we already have income taxes and can add VAT taxes for luxury goods.