This course will cover the U.S. tax rules applicable to taxation of income from U.S. (and sometimes foreign) sources received by corporations and individuals that are non-residents of the United States. In some cases, such income will be derived from passive investments and be in the form of dividends, interest, rents, or royalties. In other cases, the income will arise from active business activities. The course will address the concept of residence and entity classification, the U.S. source of income rules, the U.S. withholding tax rules (including the obligations of withholding agents) with respect to non-business income, the types of activities that can generate a "trade or business" (tax nexus) in the U.S., the U.S. rules for determining income effectively connected with a U.S. trade or business and thus taxable in the U.S., the branch profits tax, FIRPTA (foreign investment in U.S. real property) and the U.S. rules applicable to financing U.S. operations owned by non-U.S. taxpayers Finally, we will address the impact of tax treaties on the taxation of income of non-residents. This course will be of interest to students who will represent foreign resident taxpayers with economic operations in the United States.