In the UK, there’s no equivalent of a joint bank account for credit cards, because just one person has to sign the credit agreement for a card. What you can do instead is add another cardholder to your card – known as an additional cardholder. They’ll get their own card, but you’ll be fully responsible for any debt on that card and all the admin involved, so there are risks. You can get an additional card for a partner, family member or friend. It’s important that you trust your additional cardholder not to run up big debts.