Benefits for Authorized Users on Rewards Credit Cards 
Adding an authorized user to your rewards card can have huge benefits for you and the additional cardholder. It can be an excellent way to help someone with a limited credit history improve their FICO score, and some of the best cards also make valuable benefits available to authorized users.
Amex Targeted Bonus by Adding Authorized Users
By adding authorized users to a credit card account, the primary credit card account holder earns points and miles when those authorized users use their cards. Amex is running a promotion where you can earn additional bonus points by adding authorized users onto some of your accounts.
The Impact of Being an Authorized User on a Credit Card Account
One of my rewards-related routines is checking out my Credit Karma account on a weekly basis. By doing so, I can keep track of my estimated TransUnion and Equifax credit scores, while also making sure that the information reflected on my credit score…