Here in the USA the way to do it, really, is to use an LLC and have your trading accounts under that company. Trade your ass off then use the tax benefits of an LLC, like office expenses, etc., as write-offs. I'm no accountant, but I've been schooled by a few, and you can even write off trading losses when it's done properly. I would never renounce my US citizenship just to avoid taxes, however. That's just plain silly...
"The time to act is when others show signs of tire." --W.D. Gann