The United States is among only a few governments who tax international income earned by their citizens, as well as permanent residents, residing overseas. US citizens, as well as permanent residents, are required to file expatriate tax returns every year regardless of where they reside. Along with the typical tax return for income, many people are also required to submit a return disclosing assets which are held in bank accounts in foreign countries by using FinCEN Form 114 (FBAR).
Preparing a quality tax return following proper tax planning should allow one to use these, as well as other strategies, in minimizing or possibly eliminating tax liability. Note that in most cases the filing of a tax return is required, even if taxes are not owed.