Commercial Property NOI Calculator
Calculates Net Operating Income (NOI) for a commercial property by adjusting gross income for vacancy and management fees, then subtracting operating expenses. Use it when evaluating an investment property's profitability before financing.
About this calculator
Net Operating Income (NOI) is the annual income a property generates after all operating costs but before debt service and taxes. The formula is: NOI = ((Gross Rental Income + Other Income) × (1 − Vacancy Rate)) − Operating Expenses − ((Gross Rental Income + Other Income) × Management Fee%). First, total income is reduced by the vacancy and credit loss rate to reflect realistic collections. Then, the property management fee—calculated as a percentage of total gross income—is subtracted alongside all direct operating expenses such as insurance, maintenance, and utilities. NOI is the cornerstone metric used in cap rate and DSCR analysis, so getting it right is essential before any investment decision.
How to use
Suppose a building generates $120,000/year in rent and $5,000 in other income. Vacancy is 5%, operating expenses are $30,000, and the management fee is 8%. Step 1: Total income = $125,000. Step 2: After vacancy = $125,000 × (1 − 0.05) = $118,750. Step 3: Management fee = $125,000 × 0.08 = $10,000. Step 4: NOI = $118,750 − $30,000 − $10,000 = $78,750/year. This is the income available to cover debt service and investor returns.
Frequently asked questions
What is included in operating expenses for NOI calculation?
Operating expenses include property insurance, real estate taxes, maintenance and repairs, utilities paid by the owner, landscaping, and property management fees. They do NOT include mortgage payments, depreciation, income taxes, or capital expenditures. Keeping these costs separate ensures NOI reflects the property's true operational performance regardless of how it is financed.
How does vacancy rate affect commercial property NOI?
Vacancy rate directly reduces the effective gross income available to the property. Even a 5% vacancy on a $200,000 gross income property wipes out $10,000 in annual income. Lenders and investors typically underwrite with a market vacancy rate of 5–10% to stress-test the investment. Underestimating vacancy is one of the most common errors in commercial property analysis.
Why is NOI calculated before debt service in real estate analysis?
NOI is kept pre-debt-service so investors can compare properties on a level playing field regardless of their individual financing structures. A property's income-generating ability should not change based on how much leverage the buyer uses. Metrics like cap rate and DSCR then layer in the financing picture separately, giving a complete view of both asset quality and loan viability.