U.S. Taxation of Foreign Corporations
The United States imposes income taxes on foreign corporations only if they are engaged in business in the United States or receive income from sources within the United States. In general the rules governing U.S. taxation of a foreign corporation’s income is the similar as the rules for a nonresident alien.
Entity options for a foreign corporation engaged in US trade or business
“U.S.trade or business” is not defined in the tax code or regulations.