What’s the difference between an additional cardholder and a joint credit card?
An additional cardholder can make purchases with your credit card account but you remain responsible for managing it. The details of the account are only listed on your credit history. This structure also means it's possible to get an additional card for someone who is under 18 (like a teenager).
In comparison, a joint credit card account has shared responsibility between both people. Joint accounts are listed on both of your credit files and both of you will need to meet the account's eligibility requirements, including being at least 18 years old. There are also fewer credit cards that offer joint applications compared to those that offer additional cardholders.