I understand why it would be essential to give up US citizenship, considering that the U.S. utilizes citizenship in addition to residency in determining if a person's earnings is subject to U.S. taxation. All of U.S. citizens, such as those who don't live in the United States, are subject to U.S. income tax on their worldwide income.
But that does not apply to EU or Swiss taxpayers. Here it is residency exactly what counts.
And even if you become or remain a resident in Switzerland that the system is here very advantageous for wealthy men and women. Within a certain amount of wealth and earnings you can basically negotiate you communal taxes together with your local tax office. That is why we attract people such as Phil Collins, Peter Ustinov or even Michael Schumacher. They pay peanuts and can be wealthy. And if you want to put the cream on top you make your Offshore-Trusts and no matter how much is in there, your cash has lawfully become invisible against fiscal and even legal actions (divorce ) while gaining earnings, until it has touched again by the beneficiary (which can be nevertheless you).
But today comes with my real, higher priority question: Why Andorra? 0% Income Tax is fine, but to become a resident at Andorra first is the bigger issue. As a passive house license, A work permit is hard to get. I don't even know how they consider you being a trader, as you cannot ecome self. And being a very wealthy, however, illegal alien does not sound like my idea of a fun future;--RRB-. And speaking of this, who wishes to know
Catalan?
I say: Come back to Switzerland and get a good tax adviser and bring your cash to some good old Swiss private banker. Preferably one of the good old houses (200 decades ), such as Mirabaud, Pictet, LODH etc..
http://www.swissprivatebankers.com/). They do protect, manage and boost your wealth objectively and independently, while profiting of the expertise having endured the fiancial worldwide astrophe.
Is it very evident that I work for one of these banks and live in Switzerland myself? ;--RRB-