FHFA Opens VantageScore 4.0 to All Lenders: What Changed September 3

On September 3, 2026, FHFA Director Bill Pulte instructed Fannie Mae and Freddie Mac to open VantageScore 4.0 acceptance to all approved seller-servicers, ending a period when only a limited pilot group could deliver loans scored under the new model. The directive is significant, but lenders should be precise about what it actually changes on day one and what pieces of the transition are still being finalized.

How this was announced, and how to check it. Director Pulte announced the instruction in posts on X on September 3, 2026 rather than through an FHFA news release. It was reported the same day by Scotsman Guide, and subsequently by HousingWire (September 4), USA Herald (September 5) and The Mortgage Point (September 8). As of this review on September 8, 2026, FHFA's own news release and statement pages did not carry a corresponding entry, and no Selling Guide amendment implementing the all-lender change had been published. Per-source detail and as-of dates for every row are on the Mortgage Credit Score Acceptance Tracker.

What Did FHFA Actually Direct on September 3?

Prior to the September 3 instruction, Fannie Mae and Freddie Mac were accepting Classic FICO® Score and, in a controlled pilot, VantageScore 4.0 submissions from a defined set of lenders. Director Pulte's directive expanded that acceptance window: any GSE-approved lender may now submit loans with a VantageScore 4.0 credit score attached without waiting for a phased invitation.

The policy change aligns with the broader credit score modernization mandate established under the Housing and Economic Recovery Act and reinforced by FHFA's 2022 Final Rule. That rule required both GSEs to move away from Classic FICO as the sole accepted model and to incorporate both FICO 10T and VantageScore 4.0. September 3 accelerated the VantageScore 4.0 side of that mandate for lender access, though it did not supersede the existing FICO 10T parallel requirement.

For a current view of which score models each loan program formally accepts, lenders should check the conventional row of the Mortgage Credit Score Acceptance Tracker, which is updated against primary sources and carries its own as-of date.

What Has Not Changed Yet?

Expanded access is not the same as full operational parity. Several elements of the Classic FICO-to-new-model transition remain in progress as of September 3, 2026.

Tri-merge is still the default report format for most loans. The credit score modernization rule pairs the new score models with a bi-merge report requirement in certain contexts, meaning two bureau reports rather than three. However, Fannie Mae and Freddie Mac have not yet finalized the bi-merge implementation timeline or the specific eligibility criteria that would allow a lender to substitute a bi-merge for a tri-merge on a conforming loan file. Until those guidelines are published and implemented in automated underwriting systems, lenders should continue ordering tri-merge reports on conventional files unless they have specific GSE guidance covering their loan type. For current credit report format requirements by program, the Mortgage Credit Score Acceptance Tracker remains the most reliable daily reference.

Automated underwriting system updates are still rolling out. Desktop Underwriter and Loan Product Advisor are the operational gatekeepers for conforming loan decisions. A credit score model that a GSE formally accepts is not usable in practice until the AUS can receive, validate, and render a decision on that score. Lenders should confirm with their AUS vendor and their GSE seller-servicer contacts what VantageScore 4.0 inputs their current AUS version will process before submitting files.

Investor overlays have not been addressed by the FHFA directive. Secondary market investors and mortgage insurers each set their own score model and minimum score requirements, which frequently exceed GSE minimums. A lender whose investor or MI provider still requires Classic FICO will need to meet that requirement regardless of what the GSE now accepts. The mortgage insurers row of the Tracker shows current MI model acceptance status.

Lender credit reporting workflows may need updates. VantageScore 4.0 scores are drawn from the same credit file data as Classic FICO, but the score is generated by a different model with different algorithms and weighting. Lenders whose credit reporting configuration requests only Classic FICO scores will need to confirm their consumer reporting agency is delivering VantageScore 4.0 alongside or instead of Classic FICO on the tri-merge. This is a configuration and ordering question, not a data question.

How Is VantageScore 4.0 Different from Classic FICO?

Loan officers who have worked exclusively with Classic FICO will encounter meaningful behavioral differences in VantageScore 4.0 scores on the same borrower file. Understanding the key differences helps set accurate borrower expectations and informs credit strategy.

Trended data. VantageScore 4.0 incorporates 24 months of payment behavior, not just the current balance and status snapshot that Classic FICO captures. A borrower who has been paying down a revolving balance consistently over 18 months will score differently under VantageScore 4.0 than under Classic FICO, typically higher. A borrower who has been gradually accumulating revolving balances may score lower even if current utilization looks acceptable on a point-in-time basis.

Medical debt treatment. VantageScore 4.0 ignores paid medical collections and applies reduced weight to unpaid medical collections compared to Classic FICO. Borrowers with medical collection history may carry a higher VantageScore 4.0 than their Classic FICO score implies.

Thin-file scoring. VantageScore 4.0 can score consumers with as little as one account and one month of history, compared to Classic FICO's minimum of six months of history and at least one account reported in the past six months. First-time buyers and credit-thin borrowers who previously received no score under Classic FICO may now receive a scoreable result under VantageScore 4.0.

Score range alignment. Both Classic FICO and VantageScore 4.0 use a 300-850 range, so lenders and borrowers will not need to recalibrate their mental model of score tiers. The numerical range is the same; the underlying calculation and borrower rank-ordering at specific score bands will differ.

What Should Lenders Do Between Now and Full Implementation?

The September 3 directive creates an opportunity, but operational readiness determines whether a lender can act on it. A practical checklist for loan officers and operations teams:

• Verify AUS compatibility. Contact the AUS vendor and GSE seller-servicer rep to confirm VantageScore 4.0 is accepted in the current AUS version for the loan types the shop originates.
• Review credit report ordering configuration. Confirm with the credit reporting agency whether current tri-merge orders are returning VantageScore 4.0 in addition to Classic FICO, and understand how the qualifying score is selected when multiple models are present on a file.
• Audit investor and MI overlays. Check each active investor and MI provider for their current score model requirements before assuming GSE acceptance is sufficient.
• Retrain on score interpretation. Loan officers calibrated to Classic FICO will need context on how trended data and medical debt changes affect VantageScore 4.0 results so they can counsel borrowers accurately.
• Monitor the Tracker. Requirements in this transition are moving. The Mortgage Credit Score Acceptance Tracker is updated against primary GSE and program sources as guidance is issued.

Key Takeaways

• FHFA directed Fannie Mae and Freddie Mac on September 3, 2026, to accept VantageScore 4.0 submissions from all approved lenders, not just pilot participants. The instruction was announced on X and reported by the trade press; it had not appeared on FHFA's release pages, and no Selling Guide amendment had been published, as of September 8, 2026.
• The directive expands access. It does not complete the transition. Bi-merge implementation timelines, AUS updates, and investor overlays remain open items.
• VantageScore 4.0 scores trended payment behavior over 24 months, treats medical debt differently, and can score thin-file borrowers Classic FICO cannot score.
• Lenders must confirm AUS compatibility, credit report configuration, and investor or MI overlay requirements before routing files under VantageScore 4.0.
• The Mortgage Credit Score Acceptance Tracker is the fastest way to check current acceptance status by program as requirements continue to evolve.

Credit report economics shift as score model requirements change. Lenders evaluating how bi-merge adoption or VantageScore 4.0 acceptance affects per-loan costs can run their own numbers in the Profitability Simulator to model the impact at their actual volume.