Buyers ask me this one a lot — usually right after they’ve spent twenty minutes Googling tradeline companies and aren’t sure if the whole thing is legitimate. The short answer: yes, you can pay to be added as an authorized user on someone else’s credit card. That’s actually the entire business model I run at kindoflost.com.
But there’s a longer answer worth reading before you spend money, because not all AU tradelines are the same, and a few details can make the difference between a purchase that moves your score and one that doesn’t.
What you’re actually buying
When you pay to be added as an authorized user, you’re not getting a credit card. You’re not getting any access to spend on the account. What you’re getting is the reporting history of that account showing up on your credit report — specifically, the card’s credit limit, its age, and its payment record.
Those three things matter because they directly affect two of the biggest factors in your FICO score: your revolving utilization ratio and the average age of your accounts. A $25,000 card that’s been open for eight years with zero balance does a lot of good for both numbers. A $3,000 card opened last year does almost nothing.
The mechanic is the same whether a friend adds you for free or you pay a broker to match you with a stranger’s card. The credit bureaus don’t flag accounts as “purchased AU” — the account just shows up like any other account you’re associated with. That’s why it works and why lenders have been aware of it for decades without making it illegal. (There are a lot of things adjacent to this space that are illegal — like CPNs — but paying to be an authorized user is not one of them.)
What actually moves your score
The logo on the card doesn’t matter. A $30,000 Capital One card that’s ten years old does exactly as much as a $30,000 Chase card that’s ten years old. Buyers gravitate toward Chase because it sounds premium, but once that data hits your credit report, the issuer is irrelevant. What moves the needle is limit, age, and reported balance — in that order.
One thing I tell every buyer: if you’re looking at an American Express tradeline, read the fine print carefully. Since around 2015, Amex started reporting authorized users with the date they were added as the account open date — not the card’s actual open date. So a 12-year-old Amex card adds you today? Your report shows a card opened today. The age benefit is completely gone. (I’ve had to refund buyers who bought Amex tradelines elsewhere and got burned by this. It’s the most misunderstood thing in the whole space.)
For cards from Chase, Capital One, US Bank, Barclays — the original open date transfers correctly. That’s why those issuers tend to dominate the tradeline market for buyers.
How the purchase process works
There are two main paths: broker or direct.
Through a broker like Tradeline Supply Company or Boost Credit 101, you browse a marketplace of cards, pick one that fits your budget and goals, and pay. The broker takes roughly 70–75% of what you pay; the cardholder (the person whose card you’re renting) gets the remaining 25–30%. You’re added as an authorized user between the order date and the card’s next statement close, and the account typically reports to the bureaus within 30–45 days. Standard product is three billing cycles — about three months.
On my site at kindoflost.com, you’re buying directly from me, the cardholder. No broker cut. I use about 11 cards across a mix of issuers — Capital One, US Bank, a few others. The process is the same: you pay, you provide your basic info (name, DOB, address — enough to add you as an AU), I add you before the statement close, the account posts to your report, and I remove you after three cycles.
What a paid AU tradeline won’t fix
I’d rather be upfront about this than have you buy something and feel misled. Tradelines work well for thin files — people who don’t have much credit history, or who have decent history but a utilization problem dragging down their score. If the main issue is derogatory marks — a charge-off, a collection, a bankruptcy, a late payment — adding an authorized user tradeline adds positive history alongside the negative, but it doesn’t remove the negative. A mortgage lender doing manual underwriting will still see the charge-off regardless of what your score looks like.
The situations where paid AU tradelines genuinely help: you need to hit a score threshold for an auto loan approval, you’re a thin-file borrower trying to get to 680+ for a card application, you’re building credit from scratch and want to shortcut the “average age” problem. Those are real use cases where the math works.
A few red flags to watch
If a company is selling you “primary tradelines” — meaning they claim you’ll be listed as the primary account holder on someone else’s loan or credit line — that’s not what you’re looking at here, and the legitimate version of that barely exists. Legitimate paid AU tradelines are secondary accounts. You’re an authorized user. That’s it.
Also: any vendor pushing a CPN (Credit Privacy Number) alongside tradelines is running a scam. CPNs are synthetic identity fraud, full stop. Federal crime. Not a workaround, not a gray area.
Reputable brokers and direct sellers will never suggest a CPN. If they do, walk away.
Yes. Paying to be added as an authorized user on someone else’s credit card is legal. The FTC and credit bureaus are aware of the practice. It’s distinct from synthetic identity fraud (like CPNs), which is illegal. The account is real, the card is real, and the reporting to the bureaus is legitimate.
Typically 30–45 days from when you’re added. You need to be added before the card’s statement close date, and then the account reports on that cycle. Credit Karma (which shows VantageScore) may update faster than your actual FICO score — allow a full billing cycle before drawing conclusions.
Possibly, yes. Standard AU tradeline products are three billing cycles. When the account comes off your report, your utilization ratio and average account age return to where they were before. The strategy is to use that window to apply for credit you need — not to rely on the tradeline permanently.
If you want to see what’s currently available, here are the tradelines I have listed — direct from me, no broker markup. And if you have questions before buying, the tradelines FAQ covers most of what buyers ask.
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