For roughly two decades, one credit scoring model decided whether Americans could buy a house on conforming terms. That changed on April 22, 2026, when federal housing regulators approved VantageScore 4.0 and FICO 10T alongside Classic FICO for mortgage underwriting. The most consequential detail is not the branding. It is trended credit data, and it rewards a behavior pattern that older models could not see.
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Fannie Mae published historical credit score data for FICO 10T on July 1, 2026, giving lenders the reference material they need to build the models into their pricing. Adoption will be gradual and uneven across lenders through the rest of this year and into 2027. But the decision is made, and borrowers should understand what these models read differently.
Snapshot Scoring Versus Trended Scoring
Classic FICO, the model that has governed conforming mortgages, evaluates a moment. It sees the balance reported on your last statement, compares it to your limit, and produces a utilization figure. Two borrowers with a $2,000 balance on a $10,000 card look identical to it.
Trended models look at up to 24 months of reported balances and payments. Now those two borrowers look nothing alike.
- Borrower A carried $8,000 last year and has paid it down steadily to $2,000. The trend line points down.
- Borrower B carried $500 last year and has climbed to $2,000. The trend line points up.
Under a snapshot model, both show 20 percent utilization. Under a trended model, Borrower A reads as someone deleveraging and Borrower B reads as someone accumulating. Lenders have known for years that the second pattern predicts default better than the first. Now the mortgage system can price it.
The Transactor Versus Revolver Distinction
Trended data also separates people who pay their statement balance in full every month from those who pay the minimum and carry the rest. Both may show the same balance on any given month. The full-payer, often called a transactor, is a materially lower risk. Older models treated them the same. This is one of the clearest wins for disciplined cardholders whose scores never reflected their behavior.
What Rent and Utility Data Changes
Both new models can incorporate rent, utility and telecom payment history when it appears on the credit file. That is a genuine door for people with thin files: recent immigrants, young adults, cash-preferring households and anyone who has rented for a decade without ever borrowing.
Regulators estimate the shift could make roughly 5 million additional Americans scoreable for mortgage purposes. The caveat is that this data does not appear automatically. Most landlords do not report to the bureaus. Utilities generally report only delinquencies. Getting positive rent history onto your file usually requires either a landlord who uses a reporting platform or a third-party service that verifies and furnishes your payments.
What This Means Depending on Where You Stand
If Your Credit Has Been Improving
You are the primary beneficiary. Twenty-four months of falling balances and consistent full payments now carries weight that a single-month snapshot never captured. Before applying, ask the loan officer directly which model or models the lender is using and whether the file will be run under more than one. During the transition, that answer varies by institution and by loan product.
If You Recently Ran Up Balances
The reverse also holds. A borrower who paid down a card three weeks before applying could previously present a clean snapshot. Trended data sees the twelve months behind it. If you are planning a purchase in 2027, the paydown should start now, not in the month before pre-approval.
If You Have a Thin File
Focus on getting alternative data reported. Rent reporting services, secured cards used lightly and paid in full, and credit builder loans all create the tradeline history these models can read. Give it at least six to twelve months to accumulate before applying. Our guidance for building a file from limited history is in the Credit Score section.
If You Have Medical Collections
Both VantageScore 4.0 and the newer FICO models handle medical collections differently from older versions, and the three bureaus voluntarily removed medical collections under $500 from consumer reports. Larger medical collections may still appear on the report even when a given model excludes or discounts them. Pull your reports and confirm what is actually there.
Practical Steps Before You Apply
- Pull all three credit reports and read them line by line. Free weekly access remains available through the official federal site, and disputes take 30 to 45 days to resolve, so start early.
- Stop the balance climb. Aim for a downward 12-month trajectory on revolving accounts rather than a single low month.
- Pay statement balances in full where possible. Under trended scoring, being a transactor is now visible and valuable.
- Do not close old accounts before a mortgage application. Age of accounts and available credit still matter across every model.
- Ask your lender which model they will use, whether they price differently across models, and whether they will consider rent history.
- Avoid new tradelines in the six months before applying, including buy now, pay later plans, which are beginning to appear on credit files.
Why This Took Twenty Years
It is worth understanding the plumbing, because it explains why adoption will be slow. Conforming mortgages are the loans Fannie Mae and Freddie Mac will buy from lenders, and those two entities specify exactly which credit scores an underwriting file must contain. Every part of the chain, from loan origination software to mortgage insurers to the investors who buy mortgage-backed securities, is built around that specification. Changing it means rebuilding pricing grids, retraining underwriters, revising investor disclosures and re-validating automated underwriting systems.
That is why the historical data publication in July 2026 mattered so much. Lenders and investors cannot price a score they have never seen behave across a full credit cycle. With reference data in hand, institutions can begin modeling how a 720 under one system compares with a 720 under another.
The practical consequence for borrowers through 2027 is inconsistency. One lender may still pull the classic tri-merge report. Another may run a bi-merge under a newer model. A third may run both and use whichever supports approval. Shopping multiple lenders has always been worthwhile; during a model transition it is worth more than usual.
Do Not Confuse the Mortgage Score With Your App Score
The score on your banking app or card issuer dashboard is usually a VantageScore or an educational FICO variant, and it is frequently 20 to 50 points away from the score a mortgage lender pulls. That gap is not an error, it is a different model reading the same file. Judge progress by the direction your score moves over months, not by matching the number to a lender’s quote.
The Cost of Being Wrong by 20 Points
Score bands drive mortgage pricing through loan-level price adjustments. Moving from the 720 to 739 band up to 740 or above frequently changes the rate by an eighth to a quarter of a percentage point on a conforming loan. On a $400,000 loan at roughly 6.65 percent, a quarter point is about $65 a month and more than $23,000 over 30 years.
That is why the model question is not academic. If one model puts you at 738 and another at 745, and your lender can use either, the difference is real money. Ask. For the wider picture on what borrowing costs today, see the Loans section.
What Has Not Changed
Payment history remains the largest single input in every model discussed here. Amounts owed remains second. A 30-day late payment still does more damage than any modeling change will undo, and it stays on the report for seven years.
Nor does approval reduce to a number. Debt-to-income ratio, reserves, employment stability, appraisal and property type all sit alongside the score in an underwriting decision. A better score widens the door; it does not walk you through it.
The Bottom Line
The mortgage market just gained the ability to see the direction you are moving, not only where you happen to stand on statement day. For borrowers who have been steadily paying down debt, that is overdue recognition. For borrowers who have been quietly leveraging up, it removes a hiding place.
Start the 24-month trend you want a lender to see now, get rent history reported if your file is thin, and make the scoring model an explicit question during pre-approval. This article is informational and does not replace advice from a licensed mortgage professional or a certified credit counselor who can review your full file.
