(CNN) - If you didn't file your federal tax return for 2009, you could be missing out on a refund.

The Internal Revenue Service says it has $917 million in unclaimed tax refunds from 2009. more than 984,000 taxpayers haven't submitted returns for that year.

The IRS estimates roughly half of the unclaimed refunds amount to more than $500 per person, and time is running out to claim the cash.

Tax returns from 2009 must be submitted by April 15, 2013. If you miss that deadline, your money will be handed over to the U.S. Treasury.

You will not have to pay a late filing penalty if you are indeed owed a refund.

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