One formula answers it — fee ÷ extra rewards
Break-even spending = annual fee ÷ (fee card's reward rate − no-fee card's rate). Do this before anything else.
Hypothetical example: a $95 fee card earning 1 point more than a free card needs $9,500 a year of spending just to tie.
Same example: the fee card nets $49 after its fee; the no-fee card nets $72. The 'better' card leaves you $23 behind.
Credits and benefits count only at the value of what you would genuinely use. A benefit you ignore adds nothing.
Paying a fee adds nothing to how an account is reported. On-time payments and low balances do the credit work.