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Some reasons you might want to file are if you had taxes withheld and want them refunded;    if you're eligible for the Earned Income Credit (you might get a refund even if you didn't pay taxes), if somebody else is claiming you as a dependent; or in some cases you'd need to file if you're getting health care from some version of Obamacare or if you owe social security taxes on income you got a 1099 for.  There might be other reasons, IRS Publication 501 lays them out.  You can read it online here.