You do not need to change the amount on your extension filing. It is an estimate and a placeholder for the IRS. If you are calculating your tax liability, or re-estimating it and wish to pay an additional amount to avoid any underpayment penalties assessed when you file your return, you can print a voucher and mail it and a check for payment or you can pay online through the IRS website. The voucher has the mailing instructions and information you need to include on your check to be sure it is applied correctly.
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