Direct Answer
REIT NOI (Net Operating Income) is property-level rental revenue minus property-level operating expenses, such as maintenance, property taxes, and insurance. It's calculated before corporate-level items like interest expense, corporate overhead, depreciation, and capital expenditures, which lets it isolate the operating performance of the real estate itself, independent of how the REIT is financed. NOI is commonly used alongside cap rates to estimate property values.
NOI is one piece of REIT analysis. For how it fits alongside FFO, AFFO, cap rate, occupancy, and the broader choice between direct property, public REITs, and real-estate funds, see Swoopr's Real Estate & REIT Investing hub.
Key Takeaways
- NOI measures a property's operating results, not the REIT's overall corporate financial results.
- Operating expenses subtracted from rental revenue typically include items like maintenance, property taxes, and insurance.
- Corporate-level items, interest expense, corporate overhead, depreciation, and capital expenditures, sit below the NOI line, not inside it.
- Because NOI excludes financing costs, it lets investors compare property operating performance independent of how a given REIT is leveraged.
- NOI is commonly paired with cap rates to estimate property values, both by analysts building valuations and by REITs disclosing property-level results.
How Is NOI Calculated?
NOI starts with property-level rental revenue, the income a property generates from tenants, and subtracts property-level operating expenses. Those operating expenses commonly include items like maintenance, property taxes, and insurance: the recurring costs of running the property itself.
What NOI deliberately leaves out is just as important as what it includes. It's calculated before corporate-level items such as interest expense, corporate overhead, depreciation, and capital expenditures. Those items depend on decisions made above the property level, how much debt the REIT carries, how large its corporate staff is, how it accounts for asset wear over time, and how much it chooses to reinvest in upgrades. By stopping short of those items, NOI isolates the operating performance of the real estate itself, independent of how the REIT is financed.
In broad terms, the relationship looks like this:
NOI = Property-level rental revenue − Property-level operating expenses
Everything below that line, interest, corporate overhead, depreciation, capex, belongs to a separate layer of analysis, one that speaks to the REIT's overall financial structure rather than to the underlying real estate's operating quality.
Hypothetical Example, For Education Only
Consider a hypothetical property that generates $2,000,000 in annual rental revenue. Its property-level operating expenses for the year, maintenance, property taxes, and insurance, total $700,000.
NOI = $2,000,000 − $700,000 = $1,300,000
That $1,300,000 figure says nothing yet about how the property was financed. If the owner used substantial debt, a large share of that NOI could be consumed by interest expense once you move below the NOI line. If the owner used little or no debt, more of that NOI would flow through toward net income. NOI itself doesn't capture that difference, it only measures how the property performed operationally before financing enters the picture.
NOI is also commonly used alongside cap rates to estimate property values. If comparable properties in the same market are trading at an assumed cap rate of, say, 6%, dividing this property's $1,300,000 NOI by 0.06 implies a property value of roughly $21.7 million. Conversely, if this property's actual sale price were known, dividing NOI by that price would produce the implied cap rate. This example uses a placeholder cap rate strictly for illustration, actual cap rates vary by property type, market, and prevailing interest rate conditions.
Limitations and Common Mistakes
- Confusing NOI with net income. NOI excludes interest expense, corporate overhead, depreciation, and capital expenditures, all of which do affect a REIT's bottom-line net income and cash available to shareholders.
- Treating NOI as a standalone valuation. NOI is commonly used alongside cap rates to estimate property values, not used in isolation. The cap rate assumption itself carries its own uncertainty and varies by property type, location, and market conditions.
- Ignoring capital expenditures entirely. Because capex sits below the NOI line, a property with strong NOI can still require significant reinvestment to maintain that performance over time, NOI alone doesn't show that need.
- Comparing NOI across dissimilar property types without context. Operating expense structures differ meaningfully between property types (for example, industrial versus retail versus residential), so NOI comparisons are most meaningful within similar property categories and markets.
- Overlooking how NOI is affected by financing structure elsewhere in the analysis. NOI is independent of financing by design, but a REIT's overall risk and return profile still depends heavily on its leverage, a factor found below the NOI line, not within it.
Frequently Asked Questions
What is REIT NOI (Net Operating Income)?
REIT NOI is property-level rental revenue minus property-level operating expenses, such as maintenance, property taxes, and insurance. It is calculated before corporate-level items like interest expense, corporate overhead, depreciation, and capital expenditures, so it isolates how the real estate itself is performing operationally.
How is NOI different from a REIT's net income?
Net income includes corporate-level items NOI excludes, such as interest expense on debt, corporate overhead, depreciation, and capital expenditures. NOI stops at the property level, before financing decisions and non-cash accounting items affect the number, which is why analysts often use it alongside net income rather than instead of it.
Why do investors use NOI with cap rates?
NOI is commonly used alongside cap rates to estimate property values. A cap rate expresses a property's NOI as a percentage of its value, so dividing NOI by an assumed or observed cap rate gives an implied value, and dividing NOI by a known price gives the implied cap rate.
Does NOI include depreciation or capital expenditures?
No. NOI is calculated before corporate-level items like depreciation and capital expenditures. Those costs matter for a REIT's overall financial picture, but they sit below the NOI line because NOI is meant to isolate operating performance of the real estate itself.
Can NOI be compared across different REITs?
NOI can be compared across REITs and properties as a gauge of operating performance, but because it excludes financing costs, it does not by itself tell you how a REIT's capital structure or leverage affects returns to shareholders. Comparisons are most meaningful within similar property types and markets.
What is the difference between NOI and EBITDA for a REIT?
NOI is measured at the property level and stops before corporate overhead. EBITDA is measured at the company level and includes general and administrative expense, management fees, and income from any non-property business lines. A REIT with an efficient corporate structure converts more of its NOI into EBITDA than one carrying heavy overhead. Because of that gap, NOI is used for valuing individual assets against cap rates while EBITDA is used for leverage tests such as net debt to EBITDA.
How do tenant reimbursements and recoveries flow through NOI?
In many commercial leases the tenant reimburses the landlord for a share of property taxes, insurance, and common area maintenance. Those recoveries are recorded as property revenue and the underlying costs as property expenses, so both sides of NOI grow. A recovery ratio well below one means the landlord is absorbing costs it did not pass through, which compresses NOI even when base rent is unchanged. Reading the revenue detail rather than the single NOI line shows whether growth came from base rent or from recoveries.
Why is NOI measured before interest expense?
Excluding interest keeps the measure focused on how the real estate performs rather than how it was financed. Two identical buildings can carry very different mortgage balances, and including interest would make the better-financed one look like the better property. Stopping before interest also makes NOI directly usable with cap rates, which are quoted on an unlevered basis. The tradeoff is that NOI says nothing about whether the debt on the asset is serviceable, which is a separate question.
Can property-level NOI be negative?
Yes. A property in lease-up, one that has just lost an anchor tenant, or one carrying an unusually high tax or insurance assessment can produce operating expenses above its rental revenue. Development assets that are not yet generating rent behave the same way. REITs frequently exclude such properties from same-store pools so the operating trend of the stabilized portfolio stays readable, and disclose the excluded assets separately. A negative figure is a signal to read the property detail, not automatically a sign of distress.