Fannie Mae and Freddie Mac are replacing the credit score mortgages have used for 20 years. Here's what's actually different

Your mortgage approval has run on the same core credit-scoring setup for about two decades. That's now changing — but slowly, and not all at once. As of mid-2026, Fannie Mae and Freddie Mac are mid-rollout on a switch away from Classic FICO, and the two replacement models work differently enough that it's worth knowing what's actually live today versus what's still coming.

What FHFA actually validated

In October 2022, the Federal Housing Finance Agency announced that it had validated two new credit score models — FICO 10T and VantageScore 4.0 — for use by Fannie Mae and Freddie Mac (the "Enterprises"). FHFA's own release called it the Enterprises' first credit score model change in nearly 20 years. The same announcement flagged a second, related shift: eventually moving lenders from a tri-merge credit report requirement (pulling reports from all three nationwide bureaus — Equifax, Experian, and TransUnion) to a bi-merge requirement (two of the three).

Neither change happened overnight. FHFA has been explicit that implementing both models is a multiyear effort, not a single cutover date.

Where the rollout actually stands right now

Per FHFA's own credit-score policy page, the Enterprises are currently in an interim phase: approved lenders can choose, on a loan-by-loan basis, between Classic FICO and VantageScore 4.0 — but the Enterprises won't accept scores from both models on the same loan. FICO 10T isn't broadly available yet. FHFA's page notes that FICO 10T historical scores were expected to be published in summer 2026, with full adoption planned for later.

The Mortgage Bankers Association's July 2026 advocacy update confirms that status: the Enterprises have published historical score data (VantageScore 4.0 back to April 2023, FICO 10T back to April 2013) so lenders and investors can model the transition, and VantageScore 4.0 is in a "limited rollout to approved lenders" for new originations. MBA's own statement asked FHFA and the Enterprises to "complete the remaining reviews needed to make both VantageScore 4.0 and FICO 10T broadly available" — language that signals broad availability isn't there yet, even for VantageScore 4.0.

FHA-insured loans add a separate wrinkle. Per a Scotsman Guide report citing FHA's own guidance memo, FHA has affirmed it will keep requiring a tri-merge credit report "across all acceptable scoring models" — Classic FICO, FICO 10T, and VantageScore 4.0 alike — even as the scoring model itself changes. FHA said implementation dates and further guidance would come later in 2026, without committing to a specific date at the time of that report.

Why the model itself matters, not just the timeline

The two incumbent-and-challenger models don't just relabel the same math. VantageScore's own material says its 4.0 model incorporates rent, utility payments, and trended data — how an account behaved over time, not just a snapshot — and claims this lets it score about 33 million more adults than the legacy models still used for most GSE mortgages today. That's a real, specific claim, and worth noting it comes directly from VantageScore, the company that built the model and competes with FICO for the same lender business — not an independent audit of the number.

The practical version of "why this matters": someone with a thin credit file — limited credit-card or loan history, but a steady record of paying rent and utility bills — could plausibly score differently across the two models, purely because of what data each one is built to weigh, with no change in that person's actual financial behavior.

What this means if you're shopping for a mortgage today

For most borrowers, nothing changes automatically yet — the interim phase is still lender-by-lender, and FHFA and MBA's own statements describe full rollout as ongoing, not complete. If you're actively applying, the direct way to know what applies to your file is to ask your loan officer which model they're pulling: Classic FICO, VantageScore 4.0, or (once it's broadly available) FICO 10T. And regardless of which model a lender uses, the tri-merge credit-report requirement is still standard for FHA loans specifically, per FHA's own affirmed guidance.

What this isn't

This is a plain-English summary of what FHFA, MBA, and FHA have each said publicly about the credit-score model transition — not mortgage, investment, or legal advice, and not a claim about what any individual score will do. VantageScore's "33 million more" figure is the model vendor's own claim, not a number ClearValue Money has independently verified. For your specific situation, your loan officer and the credit bureaus are the direct sources for which model applies to your file and what it shows.

Where this fits

This is the same kind of underlying-mechanism check we've written about before: a rule of thumb that's changing quietly at the regulatory level, and what the primary source actually says about the timeline. We covered a similar case in how a hard inquiry actually affects your FICO Score and in what's still protecting medical debt on your credit report — in each case, the headline version of the rule and the current regulatory status turned out to be two different things worth checking directly.