Your question was which account to debit when paying income tax for a C-corp. That is not the same question as to whether or not income tax is a deduction on Form 1120. It is not listed as a deduction on Form 1120, it is calculated on Sch. J and on lines 30-37. In any case, it is an expense to the C-corp. in its books.
IMO, my first post answered the OP's question accurately (see link below). If you feel you have better guidance, please feel free to share it.