Tax Year Prior to 2020: I had to amend my 2014 return and pay additional tax. I paid in 2016. How to claim deduction for FEDERAL prior years? Step-by-step only has boxes for state and local.

[KarenL2]

Unfortunately, federal income taxes paid are not deductible.  The spaces are there for state and local because those may be deducted on Schedule A if you itemize your deductions.