DSCR Underwriting Guide: Commercial Real Estate Formulas & Bank Covenants
Exhaustive guide to Debt Service Coverage Ratio (DSCR) underwriting: calculating Net Operating Income (NOI), debt covenants, borrowing capacity, and risk tiers.
The Debt Service Coverage Ratio (DSCR) measures a commercial property or business enterprise’s operating cash flow relative to its annual debt obligations. Calculated by dividing Net Operating Income (NOI) by Total Annual Debt Service, commercial lenders require a minimum DSCR of 1.20x to 1.35x. A ratio below 1.0x indicates negative cash flow, where operating income is insufficient to service debt without external capital reserves.
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Input revenue, operating expenses, and debt payments to calculate your exact DSCR, banking risk grade, and maximum loan capacity.
1. The Core DSCR Underwriting Equation Commercial credit underwriters look strictly at cash flow generation: $$\mathbf{\text{DSCR}} = \frac{\text{Net Operating Income (NOI)}}{\text{Annual Principal} + \text{Annual Interest}}$$
A DSCR of 1.25x provides a 20% operational safety margin against vacancy, collection loss, or rising property taxes.
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