I didn’t file a return in a previous year, but I think I should have gotten a refund. What can I do?

You can file a return to get a refund anytime up to three years after the due date of the unfiled return.  After that time, you will not be able to receive any refund.  You can also amend a prior year return to receive any unpaid refund in the same three-year timeframe.  Please note that if you owe taxes on previous year’s returns, the three-year limit does not apply.