Hi @Wildflower698 - welcome to our event! That's a great question.
When you make a prepayment of taxes at the time you file your extension, this payment should appear on your tax return as an additional payment towards your tax balance.
For a 2021 tax return, the amount would show up on Schedule 3, Line 10 and from there would be carried to Form 1040, Line 31. Make sure the amount you paid with extension shows up in those two places before you file your tax return. Since you said that the amount you paid was more than needed, once the amount appears there correctly, this would result in your tax return showing a refund instead of a balance due. So by filing the tax return, you claim that refund.
I hope this helps! Have a great day.
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