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If you are not required to file - that is OK not to file.
Generally - filing requirements are based on gross income.
See IRS publication 501 page 2
So in 2014 - if you are married, filing jointly -- under 65 (both spouses) - you filing requirements starts from $20,300.If you gross income is below that threshold - you are not required to file.
You might need to file under some circumstances...For instance - if you have self-employment inconme - and want to claim deductions OR if you will owe self-employment taxes - you need to file if your self-employment income is above $400.
Under some circumstances - you might want to file even if you are not required - for isntance - if you want to claim earned income credit.
However - if you did not have any income and - you weer not required to file - and there is nothing to worry