Don't know if filing your tax return will keep your student loan payment lower, but if you are required to file a tax return, you must do so, regardless of the effect on your student loan.
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
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