Timea Iancu | December 23, 2025
Posted in: Acquisition Manager, Investment Management Trends
How to Calculate the Net Operating Income (NOI) in Real Estate: Formula & Examples
The difference between a successful commercial real estate investment and a costly mistake often comes down to thorough research. One of the key metrics CRE investment professionals analyze is the net operating income (NOI), a strong indicator of a property’s profitability and risk profile.
Here’s a guide to what you should know about net operating income calculation, as well as its importance in real estate investment.
What Is Net Operating Income (NOI) in Real Estate?
The net operating income (NOI) is a metric that shows how much revenue a property generates after operating expenses but before taxes and financing costs.
The NOI helps investors assess the profitability and risk profile of an investment and understand how returns compare to the costs of owning and managing it. It’s also a core measure of property valuation and performance in commercial real estate. This metric is widely used in market studies and analyses by institutes such as the NYC Independent Budget Office and the Urban Institute & Brookings Tax Policy Center.
In addition, NOI serves to calculate other important real estate metrics, including the debt service coverage ratio (DSCR) and the capitalization rate (cap rate).
How to Calculate the Net Operating Income (NOI)?
Calculating net operating income is essential for evaluating any commercial real estate investment, as the NOI formula reveals a property’s actual operating performance.
Net Operating Income Formula
The NOI for a property is calculated by subtracting its total operating expenses from its gross operating income.
| Net Operating Income (NOI) = Gross Operating Income – Operating Expenses |
Here is what’s included in the NOI calculation:
| NOI Components | |
|---|---|
| Gross Operating Income | Rental income (minus vacancy and credit losses) |
| Other income (parking fees, storage fees, vending machines) | |
| Operating Expenses | Property management fees |
| Utilities | |
| Insurance | |
| Property tax | |
| Maintenance costs | |
| Administrative expenses | |
NOI Example
Let’s calculate the net operating income (NOI) step by step for a 50,000-square-foot commercial building:
- With a $1,000,000 potential rental income and a 20% vacancy rate, we get an actual rental income of $800,000.
- Other income (parking fees, storage fees and vending machines) totals $15,000.
- Gross operating income will be $800,000 + $15,000 = $815,000.
- Operating expenses come down to $500,000.
- The NOI = $815,000-$500,000 = $315,000.
What Is Excluded from the NOI Calculation?
When calculating NOI in real estate, it’s important to understand why certain items are left out, as this keeps the formula focused on actual operating performance. The most common exclusions are:
- Income Tax – Real estate taxes are part of this metric, but income tax on the property’s earnings isn’t reflected in the calculation.
- Total Debt Service – Since properties can be financed with different debt structures, principal and interest payments tied to a loan are kept out of the NOI calculation to allow for consistent comparisons.
- Depreciation & Amortization – These non-cash expenses are left out because this metric focuses on actual operating cash flow.
- Capital Expenditures (CapEx) – CapEx is excluded since these costs can vary significantly from year to year and would distort operating performance. Routine repairs and maintenance, however, do fall within NOI.
- Tenant Improvements (TI) – TI costs are one-time expenses rather than part of a property’s regular cash flow, so they’re not included in this metric.
Why Is NOI Important in Real Estate?
Net operating income in real estate is one of the most widely used metrics to help investment managers, asset managers and capital markets teams to:
- Assess Investment Profitability & Risk – Estimating a property’s NOI provides insights into its current and projected performance, potential risks and overall return on investment, supporting more informed strategic decisions.
- Calculate Other Metrics – NOI in real estate is fundamental for calculating the debt service coverage ratio (DSCR), which measures the ability to cover debt obligations and the capitalization rate (cap rate), which indicates returns relative to market value.
- Make Deal Comparisons – As a standardized measure of operating performance, this metric allows investors to compare multiple opportunities and identify those that best fit their investment strategy and goals.
- Secure Financing – Properties with strong NOI are more likely to meet lender requirements and be accepted as loan collateral, providing more flexibility and leverage in obtaining favorable financing terms.
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Conclusion
Calculating and using NOI in real estate is essential for evaluating a property’s true performance and investment potential. With a clear picture of operating income, real estate professionals can better assess profitability and risk, benchmark opportunities and strengthen their position when securing financing.
FAQs
Net Operating Income (NOI) is calculated by subtracting a property’s total operating expenses from its gross operating income.
Gross operating income includes a property’s rental revenue and ancillary income, while operating expenses cover recurring costs such as maintenance, property taxes, insurance and more.
Operating expenses for NOI calculation include property management fees, utilities (when the owner is responsible), insurance, property taxes, maintenance, repairs and administrative costs.
NOI in real estate excludes debt service, income tax, depreciation, amortization, capital expenditures and tenant improvements. These items are either non-cash expenses, financing-related costs or irregular expenses that would distort NOI if included.
The NOI provides a clear view of a property’s operating performance, profitability and risk profile. It’s also used to calculate other key metrics, such as the debt service coverage ratio (DSCR) and the capitalization rate.
Gross operating income measures a property’s total income before expenses. It doesn’t account for operating costs and therefore doesn’t reflect the property’s profitability.
Net operating income is calculated by subtracting a property’s operating expenses from its gross operating income, providing a more accurate picture of a property’s financial performance and cash flow potential.
While NOI in real estate offers insight into a property’s profitability, it doesn’t provide a complete view of its overall investment performance. NOI excludes financing costs, income taxes, capital expenditures and market-driven factors such as depreciation. That’s why relying solely on this metric can overlook key risks and distort the true return potential of a property.
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