I heard that we can claim samajik surakchya tax and medicare tax if u are in OPT. i asked my employer but they are not quite sure about it and they hesitated to help me. I have been in US for complete 5 years. can i fill out form 843 and 8316? do i have to be a nonresident alien to be eligible? i think i am a resident alien but dunt know for sure. is there a easier way to find out? i dunt know what to do next. help me guys.