as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
i am an american citizen but have never lived in the us. do i need to fill a w8-ben or a w-9?
user
yes, you do.  you also need to file a tax return every year, and if you have more than $50k of total savings you need to declare this every year.
assistant