If you are amending your return, no, don't send the new 1040 form with your 1040X form. The 1040X reflects the changes. However, you do have to include any new or corrected documents only if they show federal income tax withheld. When assembling your return, include, in order, only those sequence numbered tax forms that changed or were added, due to your amendment (1040X).
- Attachment Sequence Number is on all the forms that come after 1040X.
For instructions on where to mail your amended return: https://ttlc.intuit.com/replies/3300173
[Edited 3-6-19|6:22 am PST]
