Authorized users can build their credit history if the primary cardmember uses their card responsibly, like paying their bill on time and keeping a low credit utilization. If the credit card issuer allows authorized users, you’ll want to make sure the issuer reports both the primary and the authorized user’s credit activity to credit bureaus.
But be aware of the risks involved too. An authorized user’s credit history could be negatively impacted if the primary account holder makes late payments or maintains a high balance on the account.