Most borrowers assume there’s one credit score, one cutoff, and one answer when they apply for a mortgage. That’s never been entirely true, and as of July 1, 2026, the rules got more layered than ever.
Fannie Mae and Freddie Mac, the two agencies that back the majority of conventional mortgages in the U.S., have officially begun a limited rollout giving lenders the ability to choose between three different scoring models when evaluating a borrower: Classic FICO, VantageScore 4.0, and FICO 10T. FHA is expected to follow. That sounds like a technical policy detail. For some borrowers, it could be the difference between a yes and a no.
The Credit Score Has Always Been One Piece of a Larger Puzzle
Before getting into what changed, it helps to understand what was already true: the credit score alone has never told the whole story.
I spent over 37 years in commercial banking, mortgage lending, and credit analysis. In that time, I watched lenders choose among multiple FICO scoring models long before this GSE announcement. Which model you used depended on the type of loan you were making. An auto lender might use a scoring model built specifically around vehicle loan performance. A mortgage lender originating conventional loans used whatever model Fannie and Freddie required. The score was always one input into a larger underwriting picture, and the agencies have always had sophisticated systems built to assess the full risk profile of a borrower.
What’s changed is the number of approved tools at the table, and which borrower profiles each one is designed to serve.
How the Thresholds Were Built: A Look Behind the Numbers
People talk about the 620 cutoff and the 720 benchmark like they’ve always existed. They didn’t. Someone built those thresholds from real loan data.
When I was at Bank of America in their telemortgage group, I watched the FICO model get adopted into underwriting guidelines in real time. The way it worked: the team took a 10-year lookback on loans that had already closed and added a FICO score to each loan retroactively. Then they tracked the performance of those loans against the score that borrower would have received, specifically looking at default rates and eventual foreclosures.
What they found: borrowers below 620 defaulted at a rate that made those loans unworkable. The 680 range represented average risk. Above 720, the default rate was essentially negligible. Entire loan programs, including zero-down products, were built around that data because there was a statistically grounded level of trust in what the score predicted.
That’s the foundation most borrowers are measured against today. It wasn’t arbitrary. It came from real loan performance data compiled over a decade, and it held up.
What FICO 10T and VantageScore 4.0 Actually Change
So why add new models now? Because Classic FICO was built for a borrower who already has an established credit track record, and not every qualified borrower looks like that.
FICO 10T incorporates what’s called trended data, meaning it looks at how a borrower has been managing balances and payments over the past 24 months, not just a snapshot of where they stand today. A borrower who has been consistently paying down debt shows up differently in FICO 10T than in Classic FICO, even if the current score looks identical.
VantageScore 4.0 goes further in a different direction. It’s designed to factor in rent payment history, which is a meaningful change for a specific type of borrower. If you’ve been renting and paying on time for years but haven’t built a long credit card or installment loan history, Classic FICO has very little to evaluate. VantageScore 4.0 was built to make that rental payment history count.
Who This Actually Helps
The way I read VantageScore 4.0’s role: it’s most likely to show up in first-time homebuyer programs, where lenders need something beyond a thin credit file to make a lending decision.
A borrower who has been renting for five years and paying on time every month, but hasn’t accumulated much traditional credit history, presents a real challenge under Classic FICO. That payment track record is invisible to the model. VantageScore 4.0 was designed to make it visible. For that specific borrower, the scoring model change could open a door that was previously closed.
It’s a different conversation than someone who already has a mortgage on their record. That borrower has years of housing payment history that Classic FICO can already see and evaluate. The new models matter most at the edges, where creditworthiness is harder to read from traditional data.
This doesn’t mean the risk disappears. A borrower with a thin credit file being evaluated through VantageScore 4.0 still represents a higher-risk profile, which is why lenders using that model are going to want additional documentation: rental payment records, income stability, reserves. The model opens the door. The full underwriting picture still has to support the loan. The Pre-Qualification Calculator gives you a solid baseline before you have that lender conversation, and if you’re working backward from a target home price, the Income Needed Calculator shows you exactly what income level supports it. One thing worth knowing: the YMT calculators assume an average 680 FICO score for PMI rate estimates and don’t layer in additional risk factors like employment gaps, unverified funds, or non-standard income. They’ll give you real, useful numbers to work with, but if your situation involves anything outside the standard profile on credit, income, or assets, you’ll want to sit down with a mortgage lender who can work through the specifics with you.
What to Do With This Information
If you’ve been told you don’t qualify for a conventional mortgage, or if you’re a first-time buyer with a limited credit history, it’s worth asking your lender directly which scoring model they’re using and whether any of their programs include VantageScore 4.0 or FICO 10T options.
The answer won’t be the same everywhere. This is a limited rollout and not every lender has adopted the new models yet. But the question is worth asking, especially if a thin credit file has been the barrier rather than actual financial instability.
The credit score change is real, and for some borrowers it’s a genuine opportunity. But the score is still one piece of the puzzle, and the rest of the puzzle still has to hold together.
You can learn more about who I am and how I approach mortgage guidance on the About page, and see how real borrowers have used these tools to navigate the mortgage process in the YMT Case Study.
Ask your lender what model they’re using. The rules just changed, and it’s worth knowing whether they changed in your favor.