Re: Amending 1040X, what to attach?
Level 15

After you file

Do NOT send the new 1040 (that is for your use only to verify you got the amendment done correctly) ... only send the 1040X plus any forms or schedules that changed that support column B.  

 

Read the IRS instructions here :

 

Assembling Your Return
Assemble any schedules and forms behind Form 1040-X in the
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. Don’t
attach a copy of your original return, correspondence, or other
items unless required to do so.


Attach to the front of Form 1040-X:
• A copy of any Form W-2, Form W-2c, or Form 2439, Notice to
Shareholder of Undistributed Long-Term Capital Gains, that
supports changes made on this return;
• A copy of any Form W-2G, Certain Gambling Winnings, or
Form 1099-R that supports 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); or Form 8288-A, Statement of Withholding
on Dispositions by Foreign Persons of U.S. Real Property
Interests, that supports changes made on this return.

 

https://www.irs.gov/pub/irs-pdf/i1040x.pdf

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