I filled out my parents tax forms for 2006 and already submitted it. However, I have not received a refund yet, which is what they are owed. Unfortunately, I did not know that there was additional income to report for 2006 on a 1099-MISC. What is the suggestion to report this? Do I just wait for the IRS to come after the taxes owed on it? Or, can I do an amendment to the one already submitted for 2006 a few weeks ago? Any input would help. Thanks.