If the other person is an authorized user and you're the primary cardholder, all you need to do is call the credit card company and ask it to remove the user from your card account. If the other person attempts to use the card after they're removed from the account, the card will be declined.  If you are joint credit card holders, removing someone from your credit card is harder. Both account holders must agree to close the account. Before you can close the card, the issuer will require you to pay off the balance. Keep in mind that closing a joint card could affect your credit score since you're reducing the amount of available credit you have.