https://jonathanturley.org/2012/12/12/french-government-deno...
In the case of the US, where they tax both their citizens and their residents. If you want to leave and not pay, you forfeit the residency and the citizenship.
I didnt follow too closely though.
I saw companies leaving countries for tax reasons.
I see people working 80% instead of 100% because thanks to progressive tax their net salaries remain 85+%.
Of course tax laws also factor into life decisions.
A legion of people uprooting their entire life in response to a tax hike is threatened constantly in the MSM but pretty uncommon in reality.
On the other hand companies that can change their tax residency just by saying "this is our new HQ" will yes, seek out tax havens because there's almost no cost to "moving". With political will, it would be pretty trivial to enact legislation to say that the company gets taxed based upon where they actually are.
As to why that doesnt happen see my original point: A) Congress doesnt work for you B) the media acts like you could never really close these loopholes.
Overall I'm not sure if a tax that encouraged it would be such a bad thing. It's obviously against the protestant work ethic which makes it seem almost unthinkable in America but it'd probably be healthier overall.
* It's simply Not Possible to fix the problem of widespread tax avoidance because There Will Always be Loopholes.
* In any case if you tax the wealthy too much they'll run away with their money which will be worse in the long run and the government can't stop them and Then You'll Be Really Sorry.
The public can't really be trained to believe that tax havens are ok but maybe 70% can be led to believe the lie that theres nothing that can really be done about them so they dont demand politicians fix it while a good 40% are susceptible to persistent character assassination on politicians who do try to fix it (e.g. https://www.foxnews.com/politics/aoc-ethics-complaint-met-ga...)
Trying to convince Bahamanian lawyers to charge less than a million dollars for setting up elaborate tax structures that Congress winks at because their donors like them isn't really a viable fix. A) they won't B) if they did that particular method would be shut down and theyd shify to others because the core problem of "Congress doesnt work for you" hasnt changed.