Debt yield is the metric commercial mortgage lenders rely on most when sizing loans. The calculation is simple: net operating income divided by loan amount. A property with $1 million in NOI and a $10 million loan has a 10% debt yield. Lenders prefer it to loan-to-value because it doesn't depend on appraised value, and prefer it to debt service coverage because it's independent of interest rates and amortization terms.
The intuition behind debt yield is that it represents the cap rate the lender would be earning on its principal if it foreclosed and took the property. A 10% debt yield means that even if the lender ends up owning the asset, the income alone would generate a 10% yield on the loan amount. That's a meaningful cushion — and it explains why debt yields collapsed in the years before 2008, then snapped back as a primary underwriting standard afterward.
Typical institutional minimums range from 7% to 10% depending on property type and quality. Industrial and multifamily can clear at lower debt yields because of perceived stability; office, retail, and hotels typically require higher debt yields because of the additional risk. CMBS conduits often publish their debt yield floors as a hard underwriting constraint.
When markets become frothy, debt yields fall — sometimes dangerously. Cap rates compress, NOI assumptions get aggressive, and loan amounts grow even if the underlying income doesn't. Sophisticated lenders watch debt yield trends across their portfolio as an early warning indicator of market overheating, and tighten standards when debt yields drop below historical norms.
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