Authorized User
An authorized user is a person added to someone else's credit card account who can spend on it but has no legal repayment obligation. Because most issuers report the account to the user's credit file, it is one of the fastest ways to build US credit history from zero — often producing a score within 1-2 months.
The authorized user (AU) mechanism is "credit piggybacking": the primary account's age, limit, and payment history flow into the AU's credit file, jump-starting a score that would otherwise take months to exist.
How it works. The primary cardholder adds you by name (some issuers ask for SSN or ITIN; several allow adding an AU without either). Once the issuer reports — usually within 1-2 statement cycles — the account appears on your credit report with its full history. A newcomer added to a parent's or spouse's 10-year-old card with low utilization can see a 700+ starting score.
The catches. AU cards count toward Chase's 5/24 rule (though reconsideration often excludes them on request). Some premium cards charge for AUs — the Amex Platinum charges $195 per additional Platinum card, and Capital One now charges $125 per year for authorized-user lounge access on the Venture X (since February 1, 2026). And a poorly managed primary account (late payments, maxed limit) damages the AU's file too.
Common mistakes: paying AU fees on premium cards when a no-fee card would build credit equally well, staying an AU on an account that develops late payments, and assuming AU status alone is enough — lenders eventually want to see your own accounts. The full playbook: authorized user strategy for newcomers.