If you are an employee, you may qualify for a number of tax credits.  Depending on your income and your dependents, the Earned Income Tax Credit can give you a pretty good tax refund.  See this IRS tip about the credit with details on qualifying for the credit and claiming it :

http://content.govdelivery.com/accounts/USIRS/bulletins/ebe493?reqfrom=share

With a maximum refundable credit of $6,143 (last year the average credit was $2,407), it is definitely worth it to see if you qualify and file a return even if normally you would not have a filing requirement.  Just remember that it is EARNED Income Tax Credit, so you need some type of earned income (wages, a profitable sole proprietorship, some other business income that you have to pay social security tax on) up to a maximum of $52,427 to qualify.

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