Lender Letter LL-2026-04 Governance framework on use of artificial intelligence and machine learning

Impact. This Lender Letter establishes mandatory AI governance infrastructure that touches every aspect of your mortgage operations, from underwriting algorithms to customer service chatbots. You must implement board-level oversight, bias monitoring protocols, and comprehensive model validation processes while maintaining new data quality standards and vendor management protocols for any AI-enabled systems.

Risk. Model risk management bears the highest exposure, particularly around fair lending compliance where biased algorithms could trigger enforcement action. Your examination team will scrutinize AI decision-making transparency and the adequacy of bias testing protocols, with particular focus on disparate impact in underwriting and pricing models.

Recommended Action. Convene your model risk management team with compliance and technology leaders to inventory all current AI applications across your mortgage platform. Document existing governance gaps against the Lender Letter requirements and establish a project timeline for framework implementation before the 90-day compliance window closes.

Watch. Monitor Fannie Mae's forthcoming implementation guidance and examination manual updates that will define specific testing methodologies and governance standards. Track industry enforcement actions over the next six months to understand how regulators will interpret these requirements in practice.