For federal tax return, in addition to the Form 1040-X, you need to mail the forms that changed. That would include Form 1040 and Schedule 1 (Form 1040).
For New York, according to the New York Department of Taxation and Finance:
Complete your amended return as if you are filing the return for the first time.
Submit all the forms relevant to the information in your amended return (even if you already submitted these forms with your original return), such as:
- forms for any credits you are claiming or amending,
- forms you submitted as attachments to your original return that are still applicable (for example, IT-196, IT-227, IT-558, IT-201-ATT, or IT-203-ATT), and
- all your wage and tax statements, such as Form IT-2.
Do not submit a copy of your original Form IT-201, IT-203, or IT-195.
See the instructions for Form IT-201-X or IT-203-X for additional information about what to submit with your amended return.
You need to include a copy of your Federal Form 1040-X and all the supporting forms and schedules you submit to the IRS with it.
For additional information on filing your amended New York return, click on the following link: How to change or amend a filed New York return
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