You will need to mail your amended return; you can not e-file it. You need only attach the forms that support the changes that you've made to your tax return as reflected on the 1040-X.
It can take the IRS up to 12 weeks or longer to process
them. If you are due a larger refund
than on your original return, your amended return should only show the
difference and you will receive a separate check for it. If you owe money on your amended return, it
will show only the new amount owed, you will have to mail a check with the
return. Three
weeks after you mailed your amendment, you can start tracking its progress at
the IRS
Where's My Amended Return? site.
[Edited 3/04/18 | 2:51pm]
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