What is an Expatriate of Expat?
In general terms, an expatriate – commonly shortened to expat – is someone living in a country different to the one in which they were brought up. Generally the period of residency will be long-term to permanent.
Do I need to file a Federal Tax Return if I live and work
The rules for filing a United States, U.S. tax return generally apply to you if you are a U.S. citizen or resident alien (Green Card Holder) and you live and/or work in a foreign country.
Foreign Income and Filing a U.S. Tax Return
If you lived and/or worked abroad during the Tax Year and you have gross income from worldwide sources that is at least the amount shown for your filing status, you must file a tax return. This also applies to you if you are a U.S. citizens working for the federal government (including the Foreign Service) and you are stationed abroad.
These factors generally determine whether or not you must file a tax return:
Income you earned while working in a foreign country
If you are a dependent of another U.S. taxpayer