US citizens and green card holders
US laws and IRS policy make it complicated for US citizens to maintain accounts and invest in other countries. Many banks and institutions now refuse to take on US clients due to the cost and risk of FATCA and similar legislation.
There are two options that may simplify things for US citizens:
1. Interactive Brokers is an online broker service that is willing to deal with US citizens living outside the US. As they are an American company, reporting and tax compliance is greatly simplified.
2. American Citizens Abroad has a range of services and advice.