How do I file an amended return?
Filing an amended return will correct any errors, omissions or filing status on your original return.
Use IRS Form 1040X, which can be obtained from this site www.irs.gov
You will need to state the reason for filing an amended return and show corrected tax information, as well as your original refund or balance due amount.
Do not attach your original return to the amended return.If you are expecting a refund, you must file the amendment within three years after the date you filed your original return, provided it was filed timely.