What is the difference between FHA rules and lender overlays?

FHA rules are minimum standards set by the federal government (HUD) that apply to all FHA-approved lenders. Lender overlays are stricter requirements individual lenders add on top. FHA requires 580 minimum credit score — that is the agency rule. A lender requiring 640 — that is their overlay. The borrower may qualify under FHA rules but fail the lender's overlay.

Does FHA allow 57% DTI?

Yes. FHA's official maximum DTI is 57% with compensating factors through automated underwriting. Many lenders add overlays that cap DTI at 43-50% even for FHA loans. If you were denied at 48% DTI on an FHA loan, the denial was almost certainly a lender overlay, not an FHA agency rule.

FRC Intelligence · May 2026

FHA Rules vs
Lender Overlay

By Ziya Y. · 23 Years Banking · FinanceRateCalc Decision Intelligence System

FHA (Federal Housing Administration) publishes minimum mortgage standards. These are the floor. Individual lenders are free to add stricter requirements on top — called lender overlays. The gap between these two layers is where most unexplained denials occur.

FHA Agency Rules (The Floor)

These are set by HUD and apply universally to all FHA-approved lenders:

Minimum credit score: 580 (with 3.5% down)
Maximum DTI: 57% with compensating factors
SSDI income: Accepted with 15% gross-up minimum
1099/self-employed: Accepted with 24-month history
Manual underwriting: Available for borderline files

Lender Overlays (The Ceiling They Add)

Individual lenders — even FHA-approved ones — commonly add:

Credit floor: 620, 640, or even 660 instead of FHA's 580
DTI cap: 45-50% instead of FHA's 57%
SSDI restrictions: Some lenders apply less gross-up or refuse it
Reserve requirements: 3-6 months when FHA requires none

Real example: A borrower with a 610 credit score meets FHA's 580 minimum. But most large banks apply a 640 overlay. Result: denied at Bank A, B, C. But a smaller FHA-approved lender without the overlay approves them the same day.

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FHA Rules vsLender Overlay

FHA Agency Rules (The Floor)

Lender Overlays (The Ceiling They Add)

FHA Rules vs
Lender Overlay