You need only attach the forms that support the changes that you've made to your tax return as reflected on the 1040-X. If you just received another W-2 or 1099 after you filed you tax return, then you would need to attach those forms.
Assemble any schedules and forms behind Form 1040X in order
of the “Attachment Sequence No.” shown in the upper right
corner of the schedule or form. If you have supporting
statements, arrange them in the same order as the schedules or
forms they support and attach them last. Do not attach a copy of
your original return, correspondence, or other items unless
required to do so.
Attach to the front of Form 1040X:
A copy of any Form W-2, Form W-2c, and Form 2439, Notice
to Shareholder of Undistributed Long-Term Capital Gains, that
support changes made on this return;
A copy of any Form W-2G, Certain Gambling Winnings, and
1099-R that support changes made on this return, but only if tax
was withheld; and
A copy of any Form 1042-S, Foreign Person's U.S. Source
Income Subject to Withholding; Form SSA-1042S, Social
Security Benefit Statement (Nonresident Aliens); Form
RRB-1042S, Payments by the Railroad Retirement Board
(Nonresident Aliens); and Form 8288-A, Statement of
Withholding on Dispositions by Foreign Persons of U.S. Real
Property Interests, that support changes made on this return.
Instructions for Form 1040X (Rev. December 2014) -11-Page 12 of 12 Fileid: … s/I1040X/201412/A/XML/Cycle10/source 8:04 - 10-Feb-2015
The type and rule above prints on all proofs including departmental reproduction proofs. MUST be removed before printing.
Attach to the back of Form 1040X any Form 8805, Foreign
Partner's Information Statement of Section 1446 Withholding
Tax, that supports changes made on this return.
If you owe tax, enclose (do not attach) your check or money
order in the envelope with your amended return.
Answers are correct to the best of my ability but do not constitute legal or tax advice.
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