Should You Renounce Your U.S. Citizenship?

For some people, the best tax strategy is simply to pack up and leave.

That is the lesson from the disclosure that Eduardo Saverin, the 30-year-old billionaire who helped found Facebook, has renounced his U.S. citizenship to become a resident of Singapore.

Singapore offers huge tax advantages for people like Mr. Saverin, whose wealth is primarily in the form of capital gains. The Southeast Asian city-state has no capital-gains tax and its top income-tax rate is 20%—compared with rates of 15% and 35%, respectively, in the U.S.

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