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When I was 17 my parents added me as a authorized user to one of their credit cards to help me build credit. This credit card has been reporting on my credit for 11 years now. They have never missed a payment so that is 11 years of perfect payment history on my credit. Problem is the card is always 100% (or more) maxed out at about $1,500. Should I remove myself as an authorized user, or let them keep reporting?
For scoring purposes, I don't believe that Fico counts utilization on AU cards.
However, assuming you have built positive history on your own in the last 11 years, the need for AU cards At this point is negligible.
I would go on my own. Coming off that card won't hurt your AAOA, I assume you have cards of your own, if not you should. Their utilization of that card does count against your utliization, my wife and I are AU on eachothers cards so when I pay mine down her scores increase and vice versa so this is hurting you more than helping. Just tell your parents you really appreciate their help but your in your late 20's so you want to go on your own. I have done the same for my kids to get them started but only on a card I rarely use more than 5% of the CL and once they build their own credit they are out.
My scores are stuck in the gutter right now because my only reporting card is an authorized user account with a limit of 22,000 and a balance of 19,000. My utilization is in the dark red. It certainly wouldn't hurt to remove yourself and start your own, solo journey. That way you can say you did it by yourself without the help of anyone's account.