A lot of refund money goes unclaimed every year. Right now, the IRS is holding refunds totaling $950 million for people who haven't filed a 2012 federal return.
“We especially encourage students and others who didn’t earn much money to look into this situation because they may still be entitled to a refund,” IRS Commissioner John Koskinen said in a March 10 press release. “Don’t forget there’s no penalty for filing a late return if you’re due a refund.”