S. tax purposes until they have notified the Secretary of the Department of State or of Homeland Security of expatriation or termination of residency.

• 还有的人因为税务问题甚至想放弃美国国籍。郭先生7年前就取得了美国公民身份，但随着这些年他在中国的生意越做越好，他开始感到每年的税务不堪重负。