I am a 6th year F-1 student from China. I am doing a summer internship at a company this summer. They withheld SS & MediCare taxes from my paycheck. I am not sure if I am subject to such taxes since I am considered a RA for tax purpose after my 5th F-1 year. If I am not subject to such taxes, which IRS document can I use to let the HR people understand they need not to withhold SS & medicare taxes? Thanks a lot.
Gary