The Form 1040X is scheduled to be finalized and available for e-file on 3/18/2021. We have to wait for the IRS to give us approval to use the form and they have to approve our software changes.
Note: Generally, Form 1040-X, Amended U.S. Individual Income Tax Return, must be filed within three years of the date the original return was filed, or within two years of the date the tax was paid, whichever is later.