The actual laws are rather confusing and there are various tests and exceptions to determine what you owe. It depends on how much you make, how much you have, and how much time you spend here. So there is no one answer for everyone, but the basic point I was trying to make is that you can't just walk away and think you are free of the IRS, which is what many people think.Quote from hofficita:
It was 10 years taxation on US source income. The law was recently changed. Now if you renounce, you must pay tax on all unrealized capital gains. I do not believe the 10 years of tax is still in effect.
From the government website:
"P.L. 104-191 contains changes in the taxation of U.S. citizens who renounce or otherwise lose U.S. citizenship. In general, any person who lost U.S. citizenship within 10 years immediately preceding the close of the taxable year, whose principle purpose in losing citizenship was to avoid taxation, will be subject to continued taxation."