14.3.1 [a] U.S Taxation of Canadian Residents on Personal Services IncomeUnder the Code, non-resident aliens who earn income in the U.S. are subject to federal income tax on the portion...
Code Section 7701 (a)(30)
U.S citizens are U.S Persons and Citizens of foreign countries are U.S Persons who meet either of the following two tests:
Green Card test
Substantial...
For international transactions Governments have to decide which person and what income needs to be taxed. The basis for this can be personal relationship and economic relationship.
Personal...