Which Credit Scores Do Mortgage Lenders Use? FICO 2, 4 and 5 Explained

Most mortgage lenders use three specific credit scores: FICO Score 2 from Experian, FICO® Score 4 from TransUnion and FICO Score 5 from Equifax. They pull all three, line them up, and use the middle one. So when people ask about their mortgage credit score (FICO 2, 4 and 5), the honest answer is that it’s actually three scores, and the one that counts is the one in the middle.

None of those three is the score you see in a banking app or a free credit site. That’s why so many buyers get a surprise at pre-approval, and why it pays to know which three numbers you’re really being judged on.

Why mortgages run on older scores

FICO has released many score versions over the years, and different industries settled on different ones. Credit card issuers moved to newer versions like FICO Score 8 and 9. Auto lenders often use FICO Auto Scores. Mortgage lending, which is heavily shaped by Fannie Mae, Freddie Mac and their regulator, the Federal Housing Finance Agency, stayed with the versions known as the Classic FICO scores.

myFICO lists them plainly: for mortgages, lenders typically use FICO Score 2 (Experian), FICO Score 4 (TransUnion) and FICO Score 5 (Equifax). They’re older models, and all three run on the same 300 to 850 scale as other base FICO scores.

The reason they’ve stuck around is less about the math and more about plumbing. Fannie Mae and Freddie Mac’s pricing, eligibility rules and loan-level data were all built around these scores. Changing the score means changing the entire system of pricing grids, investor models and lender software at once. That’s slow, and as you’ll see below, it keeps getting slower.

The mortgage credit score: FICO 2, 4 and 5, then the middle one

When you apply, the lender orders what’s called a tri-merge report: one combined report with data from all three bureaus, and one Classic FICO score from each.

Say the scores come back like this:

The lender ignores the highest (715) and the lowest (688) and uses the middle score: 702. If only two scores come back (say one bureau has too little data to score you), lenders generally use the lower of the two.

Two borrowers? It gets a little more interesting

Now say Alex, whose scores are above, is buying with a partner, Jordan, whose scores are 745, 760 and 731. Jordan’s middle score is 745.

For many conventional loans, the score used for pricing is the lower of the two borrowers’ middle scores, so this couple is priced at 702, not 745 and not an average. That surprises a lot of couples. It’s also why some couples run the numbers both ways and find that putting the higher-scoring partner on the loan alone gets a better rate, if that one income qualifies. Talk to your loan officer before deciding; there are trade-offs in qualifying income and ownership that go well beyond the score.

Why your three scores don’t match each other

People are often surprised that three FICO scores from the same month can be 20 or 30 points apart. Two things cause it.

The bureaus don’t have identical data. Not every lender reports to all three bureaus. A credit union card might show up at TransUnion and Equifax but not Experian. A collection might be reported to one bureau only. Different data in, different score out.

The three versions aren’t the same model. FICO 2, 4 and 5 are siblings, not triplets. They were built for each bureau’s data at the time and they treat some items a little differently.

The fix, if one bureau is dragging you down, is to pull all three reports and look for what’s different. Errors are more common than people think and can be disputed with the bureau for free.

Why your app shows a different number

Free credit apps and many card issuers show a different model entirely. Credit Karma, for example, shows VantageScore 3.0, a model built by the three bureaus. Many banks show FICO Score 8. Neither one is wrong. They’re just not the scores a mortgage lender will price your loan on.

The differences tend to show up in predictable places:

• Paid collections. VantageScore 3.0 and 4.0, and FICO Score 9, ignore paid collection accounts. The Classic FICO versions used for mortgages don’t, so a collection you paid off two years ago can still weigh on a mortgage score.
• Medical collections. Newer models treat medical debt more gently than the older mortgage versions do.
• Utilization. All models care about it, but the size of the hit varies. High card balances the month your lender pulls credit can cost more than you’d expect.

If you want the deeper comparison, our posts on FICO vs. VantageScore and why your Credit Karma score differs from your lender’s go model by model.

What the score actually changes on your loan

Two things: whether you qualify, and what you pay.

Qualifying. Most conventional loans need a representative score of at least 620. FHA loans can go lower: the FHA program, insured by HUD, allows 3.5% down with a score of 580 or higher, and 10% down for scores between 500 and 579, though individual lenders often set their own higher floors. VA and USDA loans don’t have a single government minimum score, but lenders who make them usually do.

Pricing. For conventional loans sold to Fannie Mae and Freddie Mac, loan-level price adjustments change by credit score band, generally in 20-point steps (740 to 759, 760 to 779, 780 and above, and so on down). Crossing a band boundary can change your rate or your closing costs meaningfully. A borrower at 738 is priced differently from one at 741, even though the difference in risk is basically nothing.

That band structure is the single most useful thing to know as a buyer. If your middle score is a few points below a cutoff, a month of paying down card balances before you apply can be worth real money over the life of the loan. The CFPB’s rate explorer lets you see how quoted rates move with credit score in your state.

Shopping around won’t wreck your score

A lot of people avoid comparing lenders because they don’t want multiple hard inquiries. FICO accounts for this. According to myFICO, FICO ignores mortgage, auto and student loan inquiries made in the 30 days before scoring, and after that, multiple inquiries for the same type of loan within a shopping window count as one. Newer FICO versions use a 45-day window; older versions, which include the mortgage scores, use 14 days.

So the practical rule: do your rate shopping within two weeks and you’re fine. If you want the full mechanics, see soft pulls vs. hard pulls.

What’s changing (and what isn’t, yet)

In October 2022, FHFA announced it had validated FICO Score 10T and VantageScore 4.0 for loans sold to Fannie Mae and Freddie Mac, and that lenders would eventually move from a tri-merge to a bi-merge credit report (two bureaus instead of three). Both newer models use trended data, meaning they look at how balances have moved over time rather than just a snapshot.

The rollout has been pushed back repeatedly. FHFA amended the timeline in February 2024, and in January 2025 it moved the implementation date for the new score requirements and optional bi-merge reporting from late 2025 to a date to be determined.

So for now, Classic FICO is still the mortgage standard. If you’re buying a home this year, FICO 2, 4 and 5 are the scores that matter.

A practical game plan before you apply

1. Pull all three reports (free at AnnualCreditReport.com) and look for differences between them. Our post on credit reports vs. credit scores explains what to look for. Something reported at only one bureau may explain why that score is the low one.
2. Dispute real errors with the bureau that has them. It’s free.
3. Lower card balances before the statement date, not just before the due date. Utilization is reported from the statement balance.
4. Don’t open new accounts in the months before you apply.
5. Shop lenders within about two weeks.
6. Know your FICO Score 4. It’s one of the three your lender will use, and it’s often the easiest to see in advance. Our explainer on FICO Score 4 covers what goes into it, and the why FICO 4 page shows how it compares with what most apps display.

If you’re on the other side of the desk, a loan officer trying to figure out who’s ready to buy before spending an hour on a pre-approval, the same logic applies. With a borrower’s permission, you can see their FICO Score 4 from a phone number in seconds with a soft pull. Our guide to pre-qualifying leads with a phone number walks through it, and you can run a lookup from the home page.

If your number is lower than you’d like, credit utilization is usually the fastest lever, and what hurts your credit score covers the things worth avoiding in the months before you apply.