This guide is your complete reference for understanding tradelines and how they can help you build credit. Whether you're new to credit building or looking to optimize your strategy, this pillar page covers everything you need to know.
What Is a Tradeline?
A tradeline is any credit account that appears on your credit report. Every credit card, auto loan, mortgage, or installment loan you have shows up as a separate tradeline. Each tradeline contains important information about that account:
- The creditor's name
- Your account number
- Account type (revolving or installment)
- Date the account was opened
- Credit limit or loan amount
- Current balance
- Payment history
Tradelines are the building blocks of your credit score. The information they contain determines 95% of your FICO score: payment history (35%), amounts owed (30%), length of credit history (15%), new credit (10%), and credit mix (10%).
How Authorized User Status Works
When you're added as an authorized user on someone else's credit card account, their account history is added to your credit report. This is the foundation of the tradeline industry.
Under the Equal Credit Opportunity Act (ECOA), creditors must report authorized user status to all three major credit bureaus. This means the positive payment history, account age, and credit limit of the primary account appear on your credit report.
Key point: You're added as an authorized user only for reporting purposes. You don't receive a card, can't make charges, and have no liability for the account.
Types of Tradelines
Primary Tradelines
Primary tradelines are accounts where you're the primary account holder. These are difficult to obtain if you have no credit history.
Authorized User (AU) Tradelines
AU tradelines are what the industry sells - you're added to someone's existing account as an authorized user. This is the most common type of tradeline purchased.
Seasoned Tradelines
Seasoned tradelines have 2+ years of history. The older the account, the more valuable it is for building credit age.
Primary User Tradelines
These are business or personal accounts where you become the primary user. More expensive but potentially more impactful.
How Much Do Tradelines Cost?
| Type | Age | Limit | Monthly Cost |
|---|---|---|---|
| Entry-Level | 1-2 years | $2K-$5K | $25-$50 |
| Mid-Tier | 3-5 years | $5K-$15K | $50-$125 |
| Premium | 7-15+ years | $15K-$50K+ | $150-$350 |
| Chase/Amex | 3-10 years | $10K-$50K | $100-$300 |
Legal Considerations
The act of being added as an authorized user is completely legal under ECOA. The commercial arrangement between buyers and sellers exists in a legal grey area.
The FTC has taken action against companies making false claims or operating deceptive practices, but the basic authorized user relationship has not been challenged.
As a buyer, you're not at legal risk. The regulatory attention is on brokers and sellers, not consumers purchasing authorized user access.
How to Choose a Tradeline Company
With many options available, here's what to look for:
- Reporting guarantee - Will they refund if it doesn't post?
- Transparent pricing - No hidden fees or surprise charges
- Inventory quality - Age, limit, and issuer matter
- Customer reviews - Reddit, Trustpilot, independent forums
- Delivery speed - How fast can you get added?
See our full comparison in The Best Tradeline Companies of 2026.
Maximizing Your Results
To get the most from tradelines:
- Start early in your credit journey - Thin files see the biggest impact
- Use multiple tradelines - One is good; a portfolio is better
- Time it right - 3-6 months before a major loan application
- Don't max your cards - Keep utilization low
- Build your own credit simultaneously - Tradelines are a boost, not a replacement
Frequently Asked Questions
See the FAQ section below for answers to common questions about tradelines.