GSEs authorize use of VantageScore 4.0 for all single-family lenders.

Lenders are not permitted to mix Classic FICO scores and VantageScore 4.0 on the same loan file. That rule requires originators to select one scoring model and apply it consistently across all bureau pulls used for underwriting, pricing and automated underwriting responses. Mixing models can yield divergent risk assessments and inconsistent eligibility decisions because the two systems use different algorithms and score distributions. The prohibition therefore touches loan origination systems, vendor configurations and internal policies: credit vendors, LOS platforms and AUS integrations must be set to produce and consume a single score type to avoid mismatches that could compromise investor delivery or produce incorrect pricing.

The operational fallout affects turn times, borrower communications and compliance workflows. Lenders may need to re-pull credit or establish firm fallback rules when bureaus return different score types, which can increase inquiries and documentation steps and slow underwriting. Secondary-market counterparties and pricing engines will expect clear disclosure of the scoring model used, so pricing matrices, investor eligibility checks and AUS validations should be updated. Legal, compliance and audit teams should document the chosen approach, test LOS and vendor behavior, and train staff to prevent inadvertent model mixing that can create delivery, repurchase or regulatory risk.

– Prohibition on mixing models: Lenders must use either Classic FICO or VantageScore 4.0, not both, on a single file.
– Consistency requirement: All bureau pulls used for one loan must report the same score type for underwriting and pricing.
– Systems and vendors impacted: LOS, credit vendors and AUS integrations need configuration changes to enforce single-model output and consumption.
– Borrower experience: Re-pulls or fallback rules may create extra inquiries, documentation steps and potential delays in processing.
– Secondary-market and pricing implications: Investors and pricing engines require disclosure of the model used; misalignment can affect eligibility and pricing.
– Compliance and operational controls: Documented policies, staff training and testing are needed to avoid delivery, repurchase or regulatory exposure.

You can read this full article at: https://www.housingwire.com/articles/gses-broaden-vantagescore-4-0-access-rocket-uwm-dominate-volume/(subscription required)

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