I know most tax people are unaware of this but you can do it. When you ask can I get my SS and medicare back -they look with big eye. Bur you can get your medicare and social security tax easily if you are in F1 visa. Two way to do it 1. your employer can do it for you. 2 you can do on your own If they oppose just get a letter form them that you are in fi visa and they have taken your SS and medicare tax.That is sufficient u will get your return in 3 -4 week ck out here http://www.utexas.edu/international/taxes/Form843require.html that is for texas . As I wrote you u have to send it to the tax office of your state where your office sent your medicare and social security taxes.(its different address from Federal/state tax filling address) ask them the correct address. good luck