noun · /ɛn oʊ aɪ/
NOI
Also known as: Net Operating Income
Definition
NOI (Net Operating Income) is the total income generated by a property minus all operating expenses. It's the most important profitability metric in commercial real estate because it measures a property's ability to generate income independent of how it's financed. NOI is used to calculate cap rate, determine property value, and assess whether a property can support debt.
Formula
NOI = Gross Operating Income − Operating Expenses
Or expanded: NOI = (Potential Gross Income − Vacancy) + Other Income − Operating Expenses
What's Included in NOI (and What's Not)
Included in NOI
Income
- • Base rent from all tenants
- • CAM/expense reimbursements
- • Percentage rent (retail)
- • Parking income
- • Laundry/vending income
- • Late fees and other charges
- • Less: Vacancy and collection loss
Operating Expenses
- • Property taxes
- • Property insurance
- • Utilities (if landlord-paid)
- • Repairs and maintenance
- • Property management fees
- • Landscaping and snow removal
- • Security and janitorial
- • Professional fees (legal, accounting)
NOT Included in NOI
- Debt Service
Mortgage principal and interest payments
- Capital Expenditures
Roof replacement, HVAC systems, parking lot repaving
- Depreciation
Non-cash accounting expense
- Income Taxes
Owner's income tax liability
- Tenant Improvements
Build-out costs for new tenants
- Leasing Commissions
Fees paid to brokers for securing tenants
Why Exclude These Items?
NOI is designed to measure property performance independent of ownership and financing decisions. Debt service varies by buyer, CapEx is irregular and discretionary, and depreciation is a non-cash item. Excluding these creates an apples-to-apples comparison.
NOI Calculation Example
Here's a complete NOI calculation for a 50,000 SF office building:
+ Income
− Operating Expenses
Net Operating Income (NOI)
$963,160
$1,521,000 − $557,840 = $963,160
Operating Expense Ratio: 36.7% | NOI Margin: 63.3%
Why NOI Matters
Property Valuation
Value = NOI ÷ Cap Rate. If you improve NOI by $100,000 and the market cap rate is 6%, you've added $1.67M in value. This is the foundation of value-add investing.
Loan Sizing
Lenders use NOI to calculate DSCR (Debt Service Coverage Ratio). If your NOI can't cover 1.25× the annual debt service, you won't qualify for the loan.
Performance Comparison
Since NOI excludes financing, you can compare properties regardless of how they're capitalized. A cash buyer and leveraged buyer see the same NOI.
Operations Tracking
Tracking NOI month-over-month reveals operational efficiency trends. Rising expenses or falling income show up immediately in NOI before they impact your bottom line.
Typical NOI Margins by Property Type
NOI margin (NOI ÷ Effective Gross Income) varies significantly by property type due to different lease structures and operational intensity:
| Property Type | Typical NOI Margin | Why |
|---|---|---|
| NNN Retail | 85–95% | Tenants pay all operating expenses |
| Self-Storage | 65–75% | Minimal maintenance, no TI costs |
| Multifamily | 50–65% | Higher turnover, more maintenance |
| Industrial | 55–70% | Often NNN, low operating costs |
| Office (Class A) | 35–50% | High amenities, full-service leases |
| Hotels | 30–45% | Operationally intensive, high staffing |
Analyze Your Property's NOI
Upload your rent roll to CleanRoll.ai and instantly calculate occupancy, potential income, and identify opportunities to increase NOI.