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I have “exceptional” mix without a charge card.
I have:
credit cards
student loans
car loan
no personal loans
no mortgage
no charge cards
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Agreed with @Anonymous - a charge card isn't an installment account. The mix bonus comes from revolving and installment accounts, so I would think that the charge card will not give you the extra points.
for credit-mix there are 3 types of account: bank card, revolving account, and installment loan.
a creditcard counts as "bankcard" and "revolving account"
a store card like lowes counts as "revolving account" only.
im pretty sure an amex chargecard counts as "bankcard" and "revolving account"
any kind of installment loan counts as a loan. car, home, or personal.