The latter. You would only mail in Form 1040-X and the forms/schedule's that include the adjustments made on the 1040-X.
You can now e-file Amended returns to the IRS.
- Beginning with the 2019 tax years, amended federal returns are able to be electronically filed as long as you electronically filed the original return.
- If you filed your return with TurboTax, log into your account and select the tax return that you want to amend and follow the online instructions.
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