Personal Services Nonresident aliens from treaty countries who are in the United States for a short stay and also meet certain other requirements may be exempt from tax on their compensation received for personal services performed in the United States. Many tax treaties require that the nonresident alien claiming this exemption be present in the United States for a total of not more than 183 days during the tax year. Other tax treaties specify different periods of maximum presence in the United States, such as 180 days or 90 days. Spending part of a day in the United States counts as a day of presence. Teachers and Professors Nonresident alien teachers or professors who are residents of certain treaty countries and who temporarily visit the United States for the primary purpose of teaching at a university or other accredited educational institution are not subject to U.S. income tax on compensation received for teaching for the first 2 or 3 years after their arrival in the United States.
Many treaties also provide exemption for engaging in research.
Generally, the teacher or professor must be in the United States primarily to teach, lecture, instruct, or engage in research. A substantial part of that person's time must be devoted to those duties. The normal duties of a teacher or professor include not only formal classroom work involving regularly scheduled lectures, demonstrations, or other student-participation activities, but also the less formal method of presenting ideas in seminars or other informal groups and in joint efforts in the laboratory. All treaties have provisions for the exemption of income earned by certain employees of foreign governments. However, a difference exists among treaties as to who qualifies for this benefit.