When you file your original return AND pay any taxes owed on or before 4/15/2020. If when you do your amended return you find that you owe additional taxes, you should try to mail both the amended return and the amount owed in on or before 4/15/2020 to avoid any additional penalties and interest.
If when you file your amended return, you now are due a refund, you do not have to mail your amended return in on or before 4/15/2020.
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