The direct answer
Debt service coverage ratio (DSCR) in commercial real estate commonly divides underwritten net operating income by the applicable annual debt service. A ratio above 1.0 indicates modeled income exceeds the included debt payments, but lenders may use differing definitions, stress rates, reserves and underwriting adjustments.
Use consistent periods
Divide annual NOI by annual scheduled debt service, or match monthly figures consistently. Avoid mixing monthly payments with annual NOI.
To apply the approach to an editable scenario, use the Debt Yield Calculator. For the neighboring question, explore Commercial Real Estate Investment Calculator.
Understand underwritten NOI
Lenders may normalize vacancy, management fees, reserves and other expenses rather than accepting sponsor projections unchanged.
Stress maturity and rate changes
A property that covers current interest-only payments may not cover fully amortizing payments after refinance.
Worked example
With $250,000 of underwritten annual NOI and $200,000 of annual debt service, DSCR is 1.25×. If debt service increases to $240,000 while NOI stays constant, DSCR falls to about 1.04×.
Common mistakes and limitations
Do not substitute rent collections for NOI or use one universal bank minimum DSCR as if it applied to every property.
Debt yield is not DSCR or LTV and does not incorporate interest rate or amortization.
Frequently asked questions
Is DSCR the same as debt yield?
No. DSCR uses debt service; debt yield compares NOI with loan balance.
Can DSCR change without NOI changing?
Yes. Debt payments can change because of rates or amortization.
Sources and further reading
The article’s examples are illustrative arithmetic. The references below provide context for operating, valuation or transaction concepts; they do not endorse the assumptions or the calculator.
- Office of the Comptroller of the Currency — Comptroller's Handbook — Commercial Real Estate LendingNOI, direct capitalization, cap-rate valuation and DCF concepts for commercial real estate.
- Appraisal Institute — Basic Formulas — Income CapitalizationIncome/cap-rate/value relationships, gross income multiplier and debt-coverage formula references.
Read our editorial policy for the scope of these educational methods.