My parents gave me a duplicate card in college just for emergencies and listed me as an authorized user. I'm in no way responsible for the debt, and I've never used the card. As I understand it, the computers were supposed to stop considering authorized user accounts starting in Fall 2007. The Equifax report I got through Scorewatch counted it against me, which increased my debt-to-limit ratio from 5% to 75% and is killing my credit rating (simulator says it drops me by 100 points) just as I'm starting to look for a loan for an engagement ring. I've tried to get my parents to take me off as an authorized user, but they're very slow to act. Does Equifax just use a different variant of the formula, did the change not go through, or is this an error on their part I should bring up with them? Thanks!