Guys when you are doing your Internship or OPT you don't have to pay SST and MCT. You can visit the following website. If you are paying those tax talk to your Payroll department that you are in F1 and you don't have to pay sst and mct. or if they don't exempt you from paying that you can claim your tax while filing it. But You better talk to your payroll with strong opinion and provide them the following reference. they will try to refuse doing that I don't know why. http://www.irs.gov/businesses/small/international/article/0,,id=131635,00.html