How to Calculate Net Operating Income (NOI) Accurately

The Importance of NOI

Net Operating Income (NOI) is the lifeblood of real estate analysis. It is the total income a property generates minus all necessary operating expenses. Accurately calculating NOI is crucial because it is the numerator in the Cap Rate formula and directly impacts the valuation of commercial and investment properties.

Step 1: Determine Gross Operating Income (GOI)

Start with the Gross Potential Income (GPI), which is the total rent you would collect if the property were 100% occupied year-round. Then, subtract the estimated vacancy and credit loss (rent you expect not to collect). The result is your Gross Operating Income.

Step 2: Identify Operating Expenses

Operating expenses are the costs required to run and maintain the property. Common operating expenses include:

• Property Taxes
• Property Insurance
• Property Management Fees
• Maintenance and Repairs
• Utilities (not paid by tenants)
• HOA Fees

Step 3: Calculate NOI

Subtract the total operating expenses from the Gross Operating Income. The resulting figure is your Net Operating Income.

Important Note: Do NOT include mortgage principal and interest payments, capital expenditures (major renovations), or income taxes in your operating expenses. These are not considered operating expenses when calculating NOI.