Buyers sometimes contact me having watched their Credit Karma score climb for months, then run into a wall when a mortgage broker pulls their actual FICO and the numbers don’t match. Sometimes by 40 points. Sometimes more. The question that follows — why is my VantageScore lower than my FICO? — is one I hear fairly often, and it usually comes with a side of frustration, because the free score on their phone every week isn’t the one that matters to a mortgage underwriter.
[Related: browse our tradelines for sale or check the Resources section below]
Two Different Scoring Models, Same Credit File
VantageScore was created jointly by the three major credit bureaus — Equifax, Experian, and TransUnion — as an alternative to FICO, which was built by the Fair Isaac Corporation. Both models score you on a 300–850 scale. Both read from the same underlying credit data. But the weight they assign to different behaviors, and the speed at which they respond to changes in your file, differs enough to produce two different numbers at any given point in time.
(Credit Karma, NerdWallet, and most free credit monitoring apps show VantageScore — that’s partly because it’s free for them to generate. The score you’ve been watching tick up week to week is almost certainly VantageScore, not FICO.) FICO is what the vast majority of lenders pull when you apply for a mortgage, auto loan, or major credit card. Multiple FICO versions exist — FICO 8 is the most widely used for consumer credit, but mortgage lenders typically pull three bureau-specific versions: FICO 2, FICO 4, and FICO 5, depending on the bureau. It’s a messier system than anyone would design from scratch, but that’s where we are.
If you want a Chase tradeline specifically, mine is listed here — $37K limit, opened in 2020.
Why VantageScore Often Reads Lower
The gap tends to show up when someone has been actively building credit — opening new accounts, adding tradelines, paying down balances — because VantageScore responds to some of those changes faster and more dramatically than FICO. It tends to be more sensitive to thin files, new accounts, and recent late payments. FICO, especially the versions used for mortgage lending, places heavier weight on your oldest account age and your long-term payment track record, which smooths out short-term volatility.
I ran into this personally when I was opening cards to season them for tradeline sales. I was checking Credit Karma constantly, watching my VantageScore dip with every new application — new hard inquiry, fresh account dropping the average age, all of it showing up immediately. My FICO through the lender I actually cared about was more stable. The two models were reacting to the same events at different speeds. Once I understood that, I stopped obsessing over the Credit Karma number and started checking both scores in the right context: VantageScore for general direction, FICO for anything involving an actual lender decision.
What Both Scores Actually Measure
The five underlying factors are the same for both: payment history, credit utilization, length of credit history, credit mix, and new credit inquiries. Neither model is measuring anything different — they’re just weighing those factors differently. Payment history is the dominant factor in both. Utilization matters a lot in both. Account age matters more in FICO’s older mortgage versions than in VantageScore 4.0.
What doesn’t matter to either model is which bank issued your card. This comes up for tradeline buyers more than you’d expect. I’ve had people ask whether a Capital One tradeline “counts” the same as a Chase tradeline. Once the account data hits your credit report, a $20,000 Capital One card with a 10-year history is functionally the same as a $20,000 Chase card with a 10-year history — same limit, same age, same payment record. The scoring model sees an account with those attributes. The logo on the card is irrelevant. What you want to look for in a tradeline is the credit limit, the account age, and the utilization — not the issuer brand.
Which Score Should You Actually Focus On?
For casual monitoring — tracking whether a new tradeline hit your report, watching general progress, seeing if a balance paydown moved your number — VantageScore is fine. It’s directionally accurate and available for free, which is why it’s everywhere. If you’re preparing for something specific like a mortgage, auto loan, or major credit card, find out which score version your lender uses and check that one. Many banks now show your FICO 8 in their app. Mortgage lenders will tell you which bureau they pull from, which tells you which FICO version applies.
The gap itself isn’t something to fix. It’s two different models producing two different readings from the same file. What you can control is what’s in the file — payment history, utilization, account age — and both models respond to the same underlying improvements. Our tradelines FAQ covers how authorized user tradelines work and what to expect for timing once you’re added to an account.
How Tradelines Move Both Scores
An authorized user tradeline works on the factors both models weight heavily: utilization, account age, and payment history. When you’re added to a seasoned account — long history, high limit, low utilization — those attributes appear on your report. Your overall utilization improves because there’s more available credit. Your average account age improves because you’ve added an older account. Your payment history count improves because the card’s clean record is now part of your file. None of this generates a new hard inquiry, since you’re being added, not applying.
Both your FICO and VantageScore respond to this. The timing and magnitude vary by model and by where your score currently is, but the direction is the same. For someone close to a qualification threshold — say, 640 FICO for certain loan programs, or 700 for better rates — that difference can translate into a real outcome. FICO publishes how their scoring factors work at myfico.com — worth a read if you want the primary source on weighting. For a full explanation of what is rent credit, I wrote a dedicated post on that.
No. They’re separate scoring models. VantageScore was developed by the three major credit bureaus; FICO was developed by the Fair Isaac Corporation. Both use the 300–850 range, but they weigh credit factors differently and often produce different numbers from the same file.
Mortgage lenders typically pull FICO scores — usually bureau-specific versions rather than FICO 8. The score your Credit Karma or Experian app shows is almost always VantageScore, not the version your mortgage lender will actually use. Ask your lender which bureau they pull from.
Yes. Since both models respond to the same underlying factors — utilization, account age, payment history — a well-chosen authorized user tradeline will improve your scores under both models. The timing and magnitude may differ slightly between VantageScore and FICO, but the direction is the same.
If you’re trying to move the needle on either score, browse our current tradeline listings to see what’s available. A well-chosen account improves utilization and age — the factors that carry real weight regardless of which model your lender uses.
The following is a list of resources to start learning about tradelines. We have a list of tradelines for sale, and a tradelines FAQ. Also a chart of tradeline prices from competitor sites. Finally, a contact form if you have further questions.
Feel free to ask any questions below.
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