I am researcher from India. I am in J1 visa. First 2 years I had tax exempt. Now my salary is ~2166 USD/MONTH. I am in 3rd year. Starting this year, I have been taxed every month ~537USD ( with hold). I want to know that how much I can get refund next If I file the tax return. I am single. I am a post doc. researcher in University. Whether I will have tax exempt under "doing non-profit research would be completely tax exempt". Thanks for the answers.