I am a student with F-1 visa and more than 16 months in US. I got my W-2 and based on that got to pay 400$ , but based on turbofax, IRS should give me 800$! Can I use turbofax or its illegal?
Thanks

No, turbotax will not do nonresident tax return. Your U.S. Tax Return: U.S. Tax Filing Requirements for Non-Residents (http://taxipay.blogspot.com/2008/03/us-tax-filing-requirements-for-non.html)