Debt service coverage ratio for commercial property lending

What DSCR Measures and Why Lenders Care

Debt Service Coverage Ratio divides annual net operating income by annual debt service (principal plus interest). A 1.25 DSCR means the property generates 125% of what it needs to service the loan — 25% cushion for vacancy, repairs, and rent softening. Commercial real estate lenders use DSCR as the primary underwriting metric because it answers the question that matters: does this property produce enough income to pay its loan without stressing the owner? A DSCR below 1.0 means the property does not support its debt from operations alone.

DSCR Benchmarks by Property Type

Multifamily residential: lenders typically require 1.20-1.25 minimum, prefer 1.30+. Office and retail: 1.25-1.35 minimum given higher tenant risk. Industrial and warehouse: 1.20-1.30. Hospitality (hotels): 1.35-1.50 due to income volatility. Special purpose (restaurants, car washes, gas stations): 1.40+ because the income stream depends heavily on owner operator success. These ranges vary by market conditions — tight lending periods push minimums 0.10-0.15 higher; loose periods may allow 1.10.

How to Calculate NOI Honestly

NOI is gross rental income minus operating expenses. Operating expenses include property tax, insurance, maintenance, management fees, utilities not billed to tenants, vacancy allowance, and routine capital expenditure reserves. They do NOT include mortgage principal, mortgage interest, depreciation, or income tax. Many sellers inflate NOI by excluding legitimate expenses to make the property look more attractive. Underwrite your own NOI from the actual operating statement rather than accepting seller figures.

Global vs Property-Level DSCR

Global DSCR counts all of an owner's properties combined — useful when the owner has multiple properties and consolidated finances. Property-level DSCR counts one property in isolation — the standard metric for new acquisition underwriting. Lenders typically run both. A weak property-level DSCR might be acceptable if global DSCR is strong, though interest rate and loan terms usually worsen. The calculator uses property-level math — for global analysis, sum NOIs and debt services across all properties.

Worked Example

Office building with 480,000 annual NOI. Annual debt service (principal and interest): 380,000. DSCR = 480,000 / 380,000 = 1.26x. Status: healthy, at the typical lender minimum for office properties. Excess annual cash flow: 100,000 — buffer for vacancy, maintenance, or capital improvements. Same property with 350,000 debt service (lower loan amount): DSCR 1.37x, stronger, typically getting better loan terms. Debt service at 450,000: DSCR 1.07x, technical break-even, would not qualify for most commercial loans without compensating factors.

Stress-Testing the DSCR

Real commercial underwriting stresses the calculation. What happens if vacancy hits 15%? What if a major tenant leaves? What if major capital expenditure is needed? Commercial lenders typically require DSCR under multiple stress scenarios, not just base case. A 1.25 base case that drops to 0.95 under 15% vacancy is riskier than a 1.35 base case that stays above 1.10 under the same stress. The calculator shows base case; build stress scenarios by running with reduced NOI figures to see what happens.

DSCR vs Personal Debt-to-Income

Commercial DSCR and personal DTI measure similar concepts from different angles. DTI measures percentage of income that services debt. DSCR measures coverage multiple. A 40% DTI is roughly equivalent to 2.5x DSCR — 40% of income goes to debt, 60% is excess. Commercial lenders prefer DSCR framing because it reveals cushion magnitude directly rather than inverse. Residential and personal lenders use DTI because it is easier to explain and compute from paystubs.