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Definition & Guide

How to Calculate NOI (Net Operating Income) for Real Estate Investments

Net operating income (NOI) is a property's total income minus operating expenses, excluding debt service and capital expenditures. Learn the step-by-step NOI calculation, what to include and exclude, and how NOI drives property valuation.

K

Krish

Real Estate Investor & Founder of UWmatic

Updated February 20263 min read

What Is Net Operating Income (NOI)?

Net operating income (NOI) is a property's total income minus its operating expenses, excluding debt service, capital expenditures, depreciation, and income taxes. NOI represents the property's earning power from operations and is the single most important number in commercial real estate valuation. Every key metric — cap rate, DSCR, property value, and cash flow — is calculated from NOI.

The formula is: NOI = Effective Gross Income - Operating Expenses

Step-by-Step NOI Calculation

Step 1: Calculate Effective Gross Income

Component Formula Example
Gross Potential Rent All units x 12 months x contract rent $720,000
Less: Vacancy Loss GPR x vacancy rate ($43,200)
Less: Concessions/Bad Debt Actual or estimated ($7,200)
Plus: Other Income Parking, laundry, pets, RUBS, etc. $54,000
Effective Gross Income $723,600

Step 2: Calculate Operating Expenses

Expense Annual Amount Per Unit (60 units)
Property Taxes $96,000 $1,600
Insurance $42,000 $700
Repairs & Maintenance $66,000 $1,100
Property Management (6%) $43,416 $724
Utilities $48,000 $800
Payroll $36,000 $600
Administrative/G&A $12,000 $200
Marketing $6,000 $100
Contract Services $18,000 $300
Reserves $18,000 $300
Total Operating Expenses $385,416 $6,424

Step 3: Calculate NOI

NOI = $723,600 - $385,416 = $338,184

What Is NOT Included in NOI

NOI specifically excludes: mortgage payments (principal and interest), capital expenditures (roof replacement, HVAC systems, parking lot resurfacing), depreciation and amortization, income taxes, and one-time or non-recurring expenses. These exclusions ensure NOI reflects the property's operating performance independent of financing structure and tax treatment.

Using NOI for Property Valuation

NOI directly determines property value through the income capitalization approach:

Property Value = NOI / Cap Rate

NOI Cap Rate Implied Value
$338,184 5.5% $6,148,800
$338,184 6.0% $5,636,400
$338,184 6.5% $5,202,831

Increasing NOI by just $25,000 through rent increases or expense reduction adds $416,667 to $454,545 in property value at these cap rates. This is the core of the value-add investment strategy.

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Frequently Asked Questions

What is a good NOI margin for multifamily?

NOI margin (NOI divided by EGI) typically ranges from 45% to 65% for multifamily properties. Well-operated Class B properties in moderate-cost markets often achieve 55% to 60% margins. Properties with master-metered utilities, high payroll, or significant deferred maintenance may see margins below 50%.

Should I use actual NOI or pro forma NOI?

Use actual NOI (from the T-12) for current valuation and lending decisions. Use pro forma NOI (projected after improvements) for acquisition underwriting to evaluate value-add potential. Always underwrite both and understand the gap between current and projected performance.

How does UWmatic calculate NOI?

UWmatic extracts every income and expense line item from your uploaded T-12 statement, automatically categorizing them into standard underwriting categories. It calculates actual NOI from the trailing financials and lets you model pro forma NOI with adjustable assumptions for rent growth, vacancy, expense escalation, and operational improvements. Live GSE financing data then shows the debt capacity your NOI supports.

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