parallel_prankster writes "Bloomberg reports that Eduardo Saverin, the billionaire co- founder of Facebook, has renounced his U.S. citizenship before an initial public offering that values the social network at as much as $96 billion, a move that may reduce his tax bill. From the article: 'Facebook plans to raise as much as $11.8 billion through the IPO, the biggest in history for an Internet company. Saverin's stake is about 4 percent, according to the website Who Owns Facebook. At the high end of the IPO valuation, that would be worth about $3.84 billion. Saverin, 30, joins a growing number of people giving up U.S. citizenship, a move that can trim their tax liabilities in that country. Saverin won't escape all U.S. taxes. Americans who give up their citizenship owe what is effectively an exit tax on the capital gains from their stock holdings, even if they don't sell the shares, said Reuven S. Avi-Yonah, director of the international tax program at the University of Michigan's law school. For tax purposes, the IRS treats the stock as if it has been sold.'"