Credit glossary
Overlay
A stricter rule a lender adds on top of a loan program's official requirements, most often a higher minimum credit score.
In mortgage lending, the program sets a floor and the lender can build above it. HUD lets FHA borrowers with a 580 decision score get maximum financing, but a lender can require more. Fannie Mae dropped Desktop Underwriter's minimum score for newer casefiles, but lenders may still require 620 or higher. Overlays can also cover debt-to-income limits or whether the lender will manually underwrite at all.
The practical lesson is that a denial at one lender may not be a denial everywhere. Ask whether a requirement comes from the program or the lender, and compare a few lenders before assuming you don't qualify. The entry on mortgage overlays covers the questions to ask and how overlays interact with FHA and conventional rules.
Guides that go deeper
- Credit score for an FHA loan: the 580 and 500 rules, explainedFHA allows scores down to 500 with 10% down and 580 for 3.5% down, but lenders add overlays. How FHA picks your score and what changes in 2027.
- Credit score for a conventional loan after Fannie Mae dropped 620Fannie Mae's automated underwriting no longer requires a 620 score, but manual loans, lender overlays and pricing still do. What changed and what didn't.
Sources
- Mortgagee Letter 2026-11: Updated Minimum Decision Credit Score Methodology for the Implementation of Alternative Credit Scores, U.S. Department of Housing and Urban Development
- DU Version 12.0 November 15, 2025 Release Notes, Fannie Mae
This is education, not legal or financial advice. Spot an error? Tell us and we'll fix it.