Can I deduct monthly federal tax payments as part of a payment plan for a previous tax year? If so where would I enter that?

[ColeenD3]

No, Federal income tax is never deductible.

[SweetieJean]

However, some states allow you to deduct it (but not any interest or penalties) on your State return.

[xmasbaby0]

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