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1 Best answerYou don't need to send in the 1040 form. You only send in the 1040X amended return and any forms or schedules that changed due to the amendment. I have sent in a couple of amended returns and never have sent in the 1040 return. The IRS already has a copy of that.
Assembling Your Return
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, or 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, or 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); or Form 8288-A, Statement of Withholding on Dispositions by Foreign Persons of U.S. Real Property Interests, that support changes made on this return.
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. See the instructions for line 20, earlier.
