Turkey, up to 2 years of Tax Treaty

(Reported from Internal Revenue Service (IRS), US government Publication 901)

Tax treaty for Professors, Teachers, and Researchers

An individual who was a resident of Turkey immediately before visiting the United States who is in the United States for not longer than 2 years for the purpose of teaching or engaging in scientific research is exempt from U.S. income tax on payments received from outside the United States for teaching or research.