Buyers ask me about American Express cards more than almost any other issuer. The brand has a certain weight to it — people assume that a 15-year-old Amex card with a $30,000 limit is the crown jewel of authorized user tradelines. I understand the logic. But being an AmEx authorized user comes with a quirk that changes the math entirely, and most people selling tradelines won’t bring it up unless you ask directly.

Continue reading “AmEx Authorized User: What It Actually Does to Your Credit”




