Net operating income (NOI) is a property’s total gross revenue minus its operating expenses, before debt service, capital expenditures and depreciation. It is the cash flow the property generates before financing costs, and it is the foundational input for nearly every CRE valuation and lending metric: cap rate, debt service coverage ratio and debt yield all depend on it.
How is NOI calculated?
The formula subtracts operating expenses from gross revenue:
NOI = Gross Revenue - Operating Expenses
Gross revenue includes rents, parking income, laundry revenue and other ancillary income. Operating expenses include property management fees, maintenance, utilities, insurance and real estate taxes. Debt service payments, capital expenditures and depreciation are excluded.
Illustrative example:
| Line | Amount |
|---|---|
| Gross revenue | $500,000 |
| Operating expenses | $200,000 |
| Net operating income | $300,000 |
Because NOI excludes financing, it allows an apples-to-apples comparison of property performance regardless of capital structure. Two identical buildings with different loans produce the same NOI.
Why does the NOI definition vary?
NOI is simple conceptually and complex in practice, because its definition depends on who is calculating it and for what purpose. Lenders adjust NOI during underwriting, deducting vacancy reserves, management fee floors or capital replacement reserves that the borrower may not actually incur. The result is an “underwritten NOI” that is lower than the property’s actual trailing performance. Underwritten NOI is the figure the loan is sized on; trailing NOI is the figure the covenant is later tested on.
The trailing period matters just as much for ongoing covenant testing. T-3 (trailing three months, annualized), T-6 and T-12 (trailing twelve months) NOI produce materially different results for the same property, especially for assets with seasonal income patterns or properties in lease-up. A property that passes its DSCR test on T-12 NOI is exposed to failing on T-3 NOI after a single bad quarter.
Which metrics depend on NOI?
Cap rate, DSCR and debt yield all take NOI as the numerator. Cap rate relates NOI to property value, DSCR relates it to annual debt service and debt yield relates it to the loan amount. A change in the NOI definition therefore moves all three at once.
Understanding which NOI definition your lender uses, and when the calculation is run, is essential for managing covenant compliance. The definition in the loan document, and the date the calculation is run, decide the result as much as the property’s performance does.
How NOI shows up in LoanBoss
LoanBoss tracks NOI across the portfolio using the specific definition in each loan document rather than a generic formula. The platform integrates with property accounting systems, which supply the source-of-truth financial data, and runs each lender’s adjustments on top of it, including current, T3 and T12 comparisons. Because the accounting feed updates on its own, the DSCR and debt yield built on that NOI refresh without manual entry.
Frequently Asked Questions
Does NOI include debt service?
No. NOI is calculated before financing costs, so principal and interest payments are excluded. That is what makes it comparable across properties with different capital structures.
Does NOI include capital expenditures?
No. Capital expenditures and depreciation sit below NOI. Lenders often deduct a capital replacement reserve when they underwrite NOI, which is one reason underwritten NOI comes in below actual trailing performance.
What is underwritten NOI?
Underwritten NOI is the lender’s adjusted figure, produced by deducting vacancy reserves, management fee floors or capital replacement reserves from the property’s reported numbers. It is lower than the actual trailing NOI.
What is the difference between T-3 and T-12 NOI?
T-3 annualizes the trailing three months; T-12 uses the trailing twelve. The two diverge for properties with seasonal income or in lease-up, and the loan documents say which one governs each covenant test.
How is NOI used in a cap rate?
Property value is NOI divided by the cap rate, so the same NOI supports a higher value at a lower cap rate and a lower value when cap rates expand.
Related Terms
- Debt Service Coverage Ratio
- Debt Yield
- Cap Rate
- Covenant
- Rent Roll
- T-3 vs T-12 NOI: Why Your Lender Cares and You Should Too
- DSCR and Debt Yield Tests with Lender-Specific Adjustments: The Full Catalogue
Part of the LoanBoss CRE Debt Glossary. For hedging-specific terms, see Pensford’s resources.
Sources
- LoanBoss CRE Debt Glossary