Yes, you will need to pay the extra tax by April 18 to avoid penalties and interest. If you don't get your refund by April 15, you can still pay the extra tax before the deadline.
To do that, start your amendment using the instructions above, but don't submit it, or print and mail it in yet. Make a payment to the IRS either by mailing a check, or using the online system to pay electronically.
Click here to pay electronically.
If you want to mail a check, click here and complete Form 1040-V to mail with your payment.
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