First off, make sure you need to amend your tax return. If you’ve made minor math errors, the IRS states that they will be able to handle adjustments for minor math errors without requiring a 1040x amended tax return. However, if you need to report additional income (W2s, Unemployment, etc), change your filing status, claim missed tax credits and tax deductions, then you do need to amend your tax return if it hasn’t already been accepted by the IRS.
You’ll need to file 1040x Amended U.S. Individual Income Tax Return, print and sign it, and then mail it in since you can not e-file it. It takes about 8-12 weeks for the IRS to process it after they have received the amended tax return.
-follow this link for additional information on filing-
How to Correct Federal Tax Returns - TurboTax Tax Tips ...