Go to Deductions & Credits->Estimates and Other Taxes Paid->Estimates->Federal estimated taxes paid for 2024->Additional Payments and click on Add Another Payment.
Enter the date you made the payment and the amount.
This will appear on the 1040, line 26.
There is no requirement to force the payment into Schedule 3, line 13z.
As rjs says "If this ever comes up again in the future, it would be cleaner to make it as a 1040-ES payment. You can make a 1040-ES payment late." This accomplishes that.
@Rajster11442
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