If a person not a U.S. citizen you should be obligated to pay U.S. income tax. For tax purposes, persons who are not citizens are in order to as as aliens. Aliens become residents of the U.S. or nonresidents. In general, lam sao dinh cu o my resident aliens are subject on the same taxes rules as U.S. citizens; that is, they are subject to U.S. income tax on their worldwide profit. Nonresidents are generally susceptible to income tax only on U.S. source income. Therefore, if in order to not a citizen, for dinh cu my bang cach nao (https://www.facebook.com/photo.php?fbid=243726573151752&set=a.146709686186775&type=3&theater) being to understand your income tax obligations, happen first see whether you definitely resident or nonresident.