Fannie Mae LL-2026-04: the first sector-specific AI governance mandate for lenders
Fannie Mae Lender Letter LL-2026-04 was issued April 8, 2026 and takes effect August 8, 2026. It is the first sector-specific AI governance mandate in US mortgage lending. The Letter requires lenders to inventory AI usage, document data classification, attach identity context, and produce audit records for AI-influenced credit decisions. Freddie Mac Section 1302.8 has been enforced since March 3, 2026. This piece walks through the requirements, what they mean for the lender stack, and the architecture that satisfies them.