If your 2020 E-file was "rejected" you do NOT amend, you just edit to correct the problem and re-submit
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If your 2020 E-file was "accepted"..... you cannot amend until some time in March.
What was recently filed...if it was Accepted......you must wait to receive the refund, or pay the balance due on what was originally E-filed and accepted. After that......and only in March, can you amend (Currently expected after 25 March ! )