When you have prepared your amended return and are ready to mail Form 1040-X you should include the following forms:
- The new (amended) Form 1040
- Any forms or schedules that were added or changed as a result of preparing the amendment
You will need to wait until your original tax return is processed by the IRS before filing an amended return. If you are receiving a refund, you should wait until the check is issued or you receive your direct deposit.
In regards to your state:
If you or IRS amends your federal return, under the Code of Virginia § 58.1-1812 you are required to amend your Virginia return. The IRS reports changes to federal returns to Virginia Tax. To avoid additional interest on any tax due (if applicable), file your amended Virginia return as soon as you are notified of a change to your federal income tax return by the IRS.
https://www.tax.virginia.gov/amending-yo9
