Generally, if you are a United States citizen or permanent resident (Green Card Holder) living outside the United States for more than one year, you are called an expatriate or "expat."* Rather than adding to the long list of tax guides that explain the general concepts of expat taxation,** we will focus on the specific requirements to file several US international tax forms, not well known. These are forms not well known, but they carry huge penalties for excluding or screwing up.