This would be a federal tax. It would NOT push anyone out of a state. It might push people out of the country (but if Elon leaves, that would make me very happy LOL!) Personally all states should have exactly the same kinds of state taxes or better, we should eliminate state taxes entirely and just have one federal taxing authority which distributes its money to the states. 150 years ago, different taxing structures made some sense because we have a variety of interests in different states and they worked differently. Today, every state SHOULD work just about the same. That they don't is more BECAUSE of the way taxes are done, not the other way around. I.e., the structure causes a lot of the inequities.

Regarding federal control of all tax policy, I do think there are enough differences in state economies, costs, and preferences that some state control is helpful (hard to see states giving that up). It also creates some checks and balances, in that states can compete on tax policy, which I think is a good thing.

I don't want states competing. It has destroyed the economics of some states. Texas, which has incredible oil deposits which permit it to have no income tax whatsoever, has lured people out of cities in the Northeast and Midwest where taxes can be onerous just to avoid paying the income tax. If I moved to Texas from California (when I was working full-time) I would have gotten a ten percent raise without even making a single dollar more because of the elimination of state income taxes. Why are states "in competition" with each other? We are supposed to be a country, where everyone's rights are respected, not just depending on which state you live in. It is one of the nonsensical things about this country that I believe makes us weaker, not stronger.