According to the
IRS Form 1040X instructions, attach to the front of
Form 1040X.
Also, attach any schedule or form relating to the change. This includes any additional or corrected Forms W-2 you received after
you filed your original return. For more information, see the 1040X
instructions (link included above).
-
For example, attach Schedule A (Form 1040) if you are amending Form 1040 to itemize deductions. If you are amending your return because you received another Form W-2, attach a copy of the new W-2.
Do not attach items unless required to do so. See the instructions here:https://www.irs.gov/pub/irs-pdf/i1040x.pdf
