In your example, yes, you will get a refund of $500. Most likely, as DoninGA said, the IRS will recognize the overpayment and send you a refund without your having to do anything. It will probably take several months for that to happen. Just wait and see if you get the refund. Do not amend your tax return. If you don't get the refund after a few months, you can call the IRS and check on the status.
