Here’s a primer for United States taxpayers residing abroad:

 U.S. citizens must file a tax return. Any U.S. citizen who earns income of any kind is obligated to file a U.S. tax return every year, no matter where he or she resides in the world. Many Americans, living abroad and in the U.S., find it unfair that the United States is the only country that requires citizens to file tax returns whether or not they are earning income on U.S. shores. This is a leading reason why some Americans are renouncing their U.S. citizenship.