Where are the instructions for filing a 1040X?
Do not amend your tax return until it has been fully processed by the IRS. Sending an amended return before they are done processing the original return can cause confusion and delays.
https://ttlc.intuit.com/questions/2566895-what-does-it-mean-to-amend-a-return
And---the "normal" four months for the IRS to process an amended return is taking much longer.
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