How refunds work. If you paid more through the year than you owe in tax, you may get money back. Even if you didn't pay tax, you may still get a refund if you qualify for a refundable credit. To get your refund, you must file a return. You have 3 years to claim a tax refund. Refund: Claim it or lose it (video, 2:05). Check your refund More @Wikipedia
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