First, you can choose to download the latest version of Form 1040X if you choose. TurboTax will release the most current version later this month which is a normal process. By using TurboTax the amended return can be e-filed once it's available. It is the fastest and most efficient method. The IRS does not want you to amend until your tax return has been fully processed.
The most recent version of Form 1040X should be used. As you can see when you click the link the tax year can be selected for 2019, 2018, 2017 and 2016 tax years.
The Form 1040 is never required to be filed with the Form 1040X, less is best if you will. However, you must mail any tax document that has federal withholding. You are not required to file Form 1099-B, however you will want to make sure your Form 8949 or similar document is available for review if that is what is being changed on the amendment. Sign Form 1040X before mailing if you choose that method.
Any form that does have changes due to the reason for the amendment should be filed with the Form 1040X. For example, if you are changing the Schedule D, then a new revised Schedule D must be present with the amendment.
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