Buyers ask me some version of the same question every week: how much will this actually move my score? The honest answer is that it depends on what’s dragging your score down in the first place. Let me break down what a tradelines credit boost actually does, because the variables are specific enough to be useful.
What I sell are authorized user tradelines — a buyer gets added to one of my credit cards for three billing cycles. During that time, the card’s history posts to the buyer’s credit report: its age, its limit, its payment record. You don’t get a physical card and you don’t owe anything. You’re borrowing an established account’s history.
The two things that actually move the score
Age and limit. That’s really it. A $30,000 card that’s been open for ten years does significantly more work than a $5,000 card opened two years ago. Credit scoring models care about average age of accounts and total available credit — a high-limit, old, clean card hits both levers at once.
The issuer name doesn’t matter to the scoring model. Once the tradeline posts to your report, FICO sees a $30,000 account with 10 years of clean history. It doesn’t see Chase or Capital One or whoever else. I’ve had buyers insist on Chase specifically, thinking it carries extra weight — it doesn’t, not for the scoring math. (Chase tradelines do sell faster on my end because buyers ask for them, which makes them harder to find. That’s a demand problem, not a quality advantage.)
Utilization: the thing sellers don’t always advertise
The card’s current balance relative to its limit matters. If I add you to a card with a $30,000 limit that’s carrying a $25,000 balance, the utilization is too high and the score boost will be smaller than expected. This is a place where sellers can cut corners — listing cards they’re using heavily and hoping buyers don’t ask.
I keep my listed cards at low utilization. It’s a basic quality-control thing, and it’s part of why I’m selective about what I offer. When you’re evaluating a tradeline from any seller, ask about the current balance. A high balance on the card is a red flag worth taking seriously.
The Amex quirk (and why I don’t list my Amex cards)
American Express changed how they report authorized users around 2015. Before that, when you were added as an AU on a 15-year-old Amex, your report reflected a 15-year-old account. After the change, Amex now reports the date the AU was added, not the card’s original open date. So a 15-year-old Amex added you yesterday — your report sees a card opened yesterday. The age benefit is completely gone.
I learned this the hard way when I looked at my own Amex cards and realized they were essentially useless as tradelines despite being old accounts. I don’t list them. It would feel like selling something that doesn’t work as advertised — and buyers who didn’t know the quirk would be rightly annoyed when the boost was smaller than expected.
Bank of America is also worth knowing about
BoA is known in the tradeline industry for closing cards — and sometimes related accounts — when they flag selling activity. It happened to me: a $40,000 limit card, closed with no warning. I don’t list BoA cards either. The issuer risk isn’t worth it for the buyer or for me. Capital One, Barclays, US Bank, and Fidelity are cleaner options for tradeline sellers.
What a tradelines credit boost won’t fix
Derogatory marks. A late payment, a collection, a charge-off — those stay on your report alongside the tradeline, not hidden by it. If your score is low because of recent missed payments, a tradeline will help less than if your score is low because your file is thin or your accounts are young.
The buyers who get the most out of tradelines are typically people with a decent payment history but a thin file, or people recovering from old negatives where the bad marks are aging off and they want to accelerate the rebuild. If your report is full of recent problems, deal with those first.
Before you buy
Pull your credit report and look at what’s actually lowering your score. If it’s thin file and short account age, a tradeline will likely help. If it’s high utilization on your own cards, pay those down first — that’ll move your score faster and for free. If it’s derogatory marks, dispute anything inaccurate and let the others age.
If tradelines are the right tool for your situation, you can see what I have listed — ages, limits, issuers — here.
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