If you’re new to tradelines, the terminology can sound more complicated than it really is. The good news is, the concept itself is pretty simple. What Is a Tradeline? A tradeline is simply an account listed on your credit report. Credit cards, auto loans, mortgages, and other reported accounts are all considered tradelines. What Is an Authorized User Tradeline? An authorized user tradeline, often referred to as an AU tradeline, is an established credit card account that you’r