Where do I record my tax payment I mailed to IRS for 2023 tax amount due

[xmasbaby0]

The federal tax you paid last year is not deductible and does not get entered anywhere on your 2024 federal return.  There is a handful of states where you might need to enter the federal tax you paid last year:

There are several  states that allow you to enter the federal tax you paid on your state return--Alabama, Iowa. Missouri, Montana, and Oregon.  If you are filing in one of these states watch for the deduction when you prepare your state return.