what is the maximum percentage a credit card can charge in california?

Answer 1

There is not a limit. Credit cards and other revolving type accounts are exempt from California Usury Laws.

"Time payment contracts (for example: retail installment contracts and revolving accounts) are not generally regarded as loans. The usury laws normally do not apply to them. There are no limits on finance charges for the purchase of personal, family and household goods or services at this time. Banks take the position that the charge for third party credit cards (Visa, MasterCard, American Express, etc.) are not subject to these limitations."

Answer 2

its 21% in Oklahoma