Financial Tracking
Net Operating Income (NOI): Calculate and Improve Your Profitability
How to calculate NOI correctly, why it excludes debt service and reserves, and the three levers that actually move it.
What NOI is and is not
Net operating income is gross rental income minus vacancy and operating expenses, before debt service and before income taxes. It measures the profitability of the asset itself, independent of how you financed it. Because it excludes the mortgage, NOI lets you compare two properties on equal terms.
Calculate it the same way every time
Start with gross scheduled rent, subtract vacancy and credit loss, then subtract all operating expenses: taxes, insurance, management, maintenance, utilities you pay, and HOA. Do not subtract mortgage principal or interest, capital reserves, or depreciation. Those are below the NOI line.
Three levers move NOI
You can increase income by raising rent to market or adding legitimate revenue, reduce vacancy by retaining tenants and shortening turns, or reduce operating expenses through preventive maintenance and vendor competition. Raising rent is the most powerful lever but the slowest; reducing vacancy is the fastest.
Key takeaways
- NOI excludes debt service, reserves, and depreciation by definition.
- Calculate it consistently so two properties are comparable.
- Income, vacancy, and opex are the only three levers.
Editorial Team
Rental Property Lab Editorial Team
Rental Property Lab Editorial Team creates practical educational resources, calculators, comparisons, and guides for rental property owners. Our content focuses on rental management, maintenance, improvements, products, and property financial analysis.
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