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After you file
No, you will need to mail in your payment or you can pay the additional amount due through IRS.gov. Click here to pay the additional amount due electronically. Since the due date of individual returns was extended to 5/17, you have till 5/17 to pay the additional amount due. Click here for the 1040X instructions on mailing and payment options.
‎April 5, 2021
10:06 AM