I'm not absolutely sure, because this is a mater if timing. I don't think they will take the payment until they have confirmed the posted values.
In that case the withdrawal from your account would be reduced by the amount of your estimated payments.
If they overcharge you, they will either make a direct deposit back to you or send you a paper check.
Watch your account and see what happens. If they do take it out you can contact the IRS. You can call toll-free at 1-800-829-1040 or visit a Taxpayer Assistance Center Local IRS Office
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