State the convention beside the result

NOI-based coverage divides NOI by debt service. Reserve-adjusted coverage deducts the stated reserve contribution before dividing. Under the course convention, reserves sit below NOI, so these calculations answer different questions. Required debt service must match the period and payment structure being tested. A historical interest-only period cannot silently stand in for future amortizing payments. A zero denominator does not provide a useful conventional coverage ratio.

A fictional lender review

In a fictional rental project, the sponsor calculates coverage using projected NOI while the lender's preliminary worksheet deducts replacement reserves and adjusts income. Their conclusions differ even though neither spreadsheet has an arithmetic error. The sponsor reconciles income, expenses, reserve treatment, and payment assumptions line by line. The decision is to revise the financing case using the lender's stated method before estimating available debt, rather than claiming approval based on the sponsor's preferred calculation.

Coverage is not a loan commitment

Actual requirements depend on lender underwriting and documents. A satisfactory illustrative ratio does not establish acceptable collateral, guarantees, draw conditions, liquidity, or loan availability. Test weaker operating income and the payments expected after any temporary payment relief ends. Keep annual coverage separate from monthly cash availability: uneven receipts can cause a shortfall despite an acceptable annual picture. The next useful step is to understand the mortgage constant, which connects the assumed loan principal to annual debt service without confusing that relationship with the note rate.

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General information—not personalized legal, tax, investment, engineering or architectural advice.