To clarify, are you talking about a (year-delinquent) balance due payment for the 2023 tax year, or the 2024 estimate that is (was) required to be paid upfront 4/15/24?
I believe the balance due pmt needs to be done when you efile. You could do an extension payment efile auto debit prior to e-filing, but I don't think you can submit a balance due auto-debit separate from e-filing the return.
Not sure about the next year's estimate, but I do think that can be an efile auto-debit separate from the return.
You'd have to try it and see.
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