Why "Classic FICO" has run the show for 20 years

For almost two decades, Fannie Mae and Freddie Mac, the two government sponsored enterprises that buy and back most U.S. home loans, required lenders to evaluate borrowers using a single credit scoring model known as "Classic FICO." Because these two entities touch the vast majority of conventional mortgages, that one model effectively became the industry standard nationwide.

What's actually changing

In October 2022, the Federal Housing Finance Agency (FHFA), the regulator that oversees Fannie Mae and Freddie Mac, validated two newer credit scoring models for mortgage use: FICO® Score 10T and VantageScore® 4.0. Both were built to be more predictive and more inclusive than Classic FICO.

As of September 9, 2026, VantageScore 4.0 has reached broad availability, meaning lenders can use it without needing special prior approval. FICO 10T has also been validated but is not yet available for loans delivered to Fannie Mae or Freddie Mac; FHFA has not announced a timeline for that rollout.

Two things to keep in mind: adopting the new models is currently optional for lenders, so Classic FICO is still very much in use, and lenders are still required to pull credit reports from all three national credit bureaus (a "tri merge" report). A future move to two bureau ("bi merge") reporting has been discussed as a way to reduce costs, but FHFA has deferred that change for now to keep the transition manageable.

FICO 10T vs. VantageScore 4.0: the real differences

1. Both new models use "trended" data

Classic FICO looks at your credit as a single snapshot: your balances and activity as of the day the report is pulled. FICO 10T and VantageScore 4.0 both look back over the prior 24 months to identify trends. If you paid a credit card balance down from $12,000 to $8,000 over that time, the newer models can recognize that improvement rather than judging you solely on the $8,000 that remains.

2. VantageScore 4.0 can score "thinner" credit files

This is one of the most meaningful practical differences. VantageScore 4.0 can generate a score with as little as one month of credit history, even from a single account. FICO models generally require an account that's at least six months old with recent reported activity. That gap is the main reason VantageScore can score significantly more people than FICO models can.

3. Alternative payment data

VantageScore 4.0 can incorporate on time rent, utility, and telecom payments as a positive factor, when that history is reported to the credit bureaus. Classic FICO does not consider this kind of data at all, which has historically left responsible renters without much credit to show for years of on time payments.

4. Who builds each model

FICO is developed by the Fair Isaac Corporation. VantageScore was developed jointly by the three major credit bureaus (Equifax, Experian, and TransUnion) as a competing model. Both currently use the same familiar 300 to 850 score range, so the number itself will still look the way homebuyers are used to seeing it.

Why this is a good thing for buyers

• Credit trends, not just balances, get counted, rewarding people who are actively improving their finances.
• More people become scoreable. VantageScore's own research estimates roughly 33 million more U.S. adults are scoreable under VantageScore 4.0 than under FICO models, a meaningful opportunity for first time buyers and younger buyers building credit for the first time.
• Renters may finally get credit for the rent they've paid on time for years, if that payment history is reported to the bureaus.
• "Dormant" credit files can come back into the picture. VantageScore's research identifies roughly 24 million consumers with established but currently inactive credit files, and finds that 77% of them score Near Prime or Prime once VantageScore 4.0 is applied.
• More competition between scoring models is, in FHFA's own words, intended to help lower costs for consumers, promote competition, and spur innovation over time.

A fair word about competing claims

It's worth knowing that FICO and VantageScore are competitors, and each has published research favoring its own model. VantageScore highlights how many more consumers it can score. FICO, meanwhile, points to a study conducted by the actuarial firm Milliman, commissioned as part of a consulting engagement with FICO, which found that FICO Score 10T predicted mortgage defaults more accurately than VantageScore 4.0 across nearly 20 million mortgages, with the biggest advantage on FHA loans. Both studies are sourced below. The balanced takeaway: regulators have approved both models, each has real strengths, and which one your lender actually uses can still vary from loan to loan.

What this means for you right now

• This isn't automatic yet. The rollout is gradual, so ask your loan officer directly which credit score model is being used to evaluate your loan.
• Keep doing the fundamentals. Paying down balances and making on time payments helps under any model, and it helps even more under the new trended data approach.
• If you're a renter, ask whether your landlord or property manager reports your payments to the credit bureaus, or look into third party rent reporting services, since that history may now be able to work in your favor.
• Talk to a lender before you assume you don't qualify. If your file is thin, dormant, or renter heavy, you may be in a stronger position than you think under the newer models.