This course is an introduction to international income taxation of business transactions. After a brief explanation of basic income tax concepts, the principal rules of taxation relating to international business will be examined. The course will then focus on how the United States’ rules interact with taxation systems in other countries, exploring the concepts of source of income and residence of the taxpayer, and their role in the tax rules relating to international trade. The second term of the course will focus on bilateral tax treaties as a means of promoting crossborder investments and international trade through the avoidance of international double taxation. The OECD model treaty will be examined as an illustration of the interaction between double tax treaties and domestic regulations. Finally, the course will explore recent developments in the international effort to reduce tax-base erosion and income shifting among taxing jurisdictions.