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DSCR (Debt Service Coverage Ratio) Calculator

Evaluate whether your property's net operating income (NOI) comfortably covers your annual mortgage debt service.

DSCR Underwriting Tool

Debt Service Coverage Ratio (DSCR) Calculator

Evaluate net operating income against annual loan payments

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Total Annual Debt Service: $187,500/yr ($15,625/mo)

Standard Commercial Bank Underwriting Tiers:
  • ≥ 1.25x: Standard Commercial Bank Minimum Threshold
  • 1.15x - 1.20x: Acceptable for prime Long-term Net Lease/Government tenants
  • < 1.00x: Distressed / Negative Cash Flow

Underwriting Analysis

Debt Service Coverage Ratio (DSCR)
1.33x
Healthy Safety Margin (Meets or exceeds commercial lender standards)
Annual NOI:$250,000
Annual Debt Service:$187,500
Annual Pre-Tax Cushion:$62,500
Max Allowable Debt for 1.25x:$200,000
Tip: Higher DSCR reflects a larger income cushion against tenant vacancy or rate increases.

What Is DSCR and Why It Matters

The Debt Service Coverage Ratio (DSCR) is the single most important risk metric used by commercial real estate lenders to evaluate mortgage applications. It measures a property's annual Net Operating Income (NOI) against its annual debt service (total principal and interest payments), reflecting the safety margin between operational cash flow and mortgage obligations. Commercial banks and institutional lenders typically require a minimum DSCR of 1.20x to 1.25x. This buffer ensures that the property generates sufficient surplus cash flow to withstand unexpected vacancy spikes, rent concessions, or rising operating expenses without defaulting on loan payments.

The Formula

DSCR = Annual NOI / Annual Debt Service
Annual Net Operating Income (NOI):Effective gross rental income minus operating expenses (before debt service and income taxes)
Annual Debt Service:Total principal and interest paid over 12 months

A Real Commercial Real Estate Example ($2M Office Building)

Suppose you are purchasing a commercial office building for $2,000,000 with a $1,500,000 mortgage. The property generates $220,000 in effective gross income and incurs $70,000 in operating expenses, resulting in an annual NOI of $150,000. At a 6.5% interest rate on a 25-year amortization schedule, monthly debt service is $10,128, bringing annual debt service to $121,536. DSCR = $150,000 / $121,536 = 1.23x 【Interpretation】: A 1.23x ratio is near the standard lender threshold (1.20 - 1.25x). A lender might require a slightly larger down payment or debt service reserve fund to approve the loan.

Frequently Asked Questions

What is a good DSCR ratio for a commercial real estate loan?

Most commercial banks, CMBS lenders, and life insurance companies require a minimum DSCR between 1.20x and 1.25x. Stabilized single-tenant net-lease properties may qualify at 1.15x, while higher-risk asset classes (like hospitality or value-add retail) often require 1.35x to 1.50x.

What happens if DSCR falls below 1.0?

A DSCR below 1.0x means the property does not generate enough net operating income to cover its debt payments (negative cash flow). Lenders will decline new loan applications, and for existing loans, a sub-1.0 DSCR can trigger default covenants requiring the borrower to pay down principal.

How can an investor improve a property's DSCR?

You can increase DSCR by either increasing NOI (raising rents, reducing vacancy, cutting operating costs) or lowering annual debt service (increasing your down payment to borrow less, negotiating a lower interest rate, or extending the amortization period).

How does DSCR differ from Cap Rate and Cash-on-Cash Return?

Cap Rate measures property return independent of debt; Cash-on-Cash Return measures leveraged equity return; DSCR measures debt coverage safety margin. Lenders rely on DSCR to dictate maximum loan sizing.

Full Underwriting Tool

Run Complete Underwriting Including DSCR in Deal Analyzer

Calculate Cap Rate, Cash-on-Cash, DSCR, and BER simultaneously with stress testing.

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