NEW YORK (CBSNEWS.COM) – Attention, taxpayers: If you haven’t filed a tax return for 2015, your time to claim money owed you is running out. The Internal Revenue Service said as many as 1.2 million Americans who haven’t claimed a tax refund for that year have until April 15 do so.

And those refunds could be substantial. The agency said this week that as much as $1.4 billion in unclaimed refunds could be up for the taking.

The top of a form 1040 individual income tax return. (credit: Tim Boyle/Getty Images)

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