If you are required to file then you must even if you will not owe anything ...
DO I NEED TO FILE A TAX RETURN?
https://www.irs.gov/help/ita/do-i-need-to-file-a-tax-return
Who has to file?
http://www.irs.gov/uac/Do-I-Need-to-File-a-Tax-Return%3F
