Is Your Real Estate Actually Profitable?
Net Operating Income is the single most important number in commercial real estate. Here's how it works, what it includes, what it doesn't, and why a $10,000 swing in NOI can move a property's value by six figures.
Most investors spend time looking at cap rates, price per square foot, and gross rent. Those numbers matter. But none of them mean much without understanding what's underneath: Net Operating Income.
NOI is the foundation of how commercial real estate is valued. It's the number an appraiser uses. It's what a buyer underwrites. It's what a lender evaluates when sizing a loan. If you're investing in commercial real estate and you can't build an NOI from a rent roll and an expense report, you're working with incomplete information.
The Formula
NOI is not complicated. The formula is straightforward:
Gross Rental Income
minus Vacancy and Credit Loss
= Effective Gross Income
minus Operating Expenses
= Net Operating Income
Start with the income the property generates at full occupancy. Subtract realistic vacancy and any tenants who don't pay. That gives you effective gross income. Then subtract all the operating expenses you're responsible for as the owner: property taxes, insurance, maintenance, management fees, any utilities you cover. What's left is NOI.
What's Included in Operating Expenses
Operating expenses are what it costs to run the property, not to own it. The distinction matters. Standard operating expenses include:
Property taxes, building insurance, property management fees, routine maintenance and repairs, landscaping, snow removal, common area utilities, and any costs tied to keeping the building functional and leased.
Gross leases push more of these costs onto the landlord. Triple-net leases shift many of them to tenants. The lease structure on a property directly affects what ends up in your expense line, which directly affects NOI.
What Is Not Included in NOI
This is where investors make mistakes. The following do not belong in an NOI calculation:
Debt service (your mortgage payment) is not an operating expense. It's a financing cost. Two investors can buy the same property at the same price with completely different loan terms and end up with identical NOIs.
Capital expenditures, like a roof replacement or HVAC upgrade, are not operating expenses. They're capital items. Income taxes are not included either. Depreciation doesn't belong in NOI.
When you see a seller's NOI that includes debt service deducted or capital costs buried in the expense line, that's a red flag. It can artificially compress NOI and make a property appear to cash flow less than it actually does.
Why a $10,000 Swing in NOI Moves Value by Six Figures
Commercial real estate is valued on income, not comparables. The formula is:
Value = NOI / Cap Rate
At a 7% cap rate, a property with $70,000 in NOI is worth $1,000,000. Add $10,000 in NOI by reducing vacancy, renegotiating a lease, or cutting controllable expenses, and the same property at the same cap rate is now worth $1,142,857. That's a $142,857 increase in value from a $10,000 income improvement.
This is why value-add investing works. You're not waiting for the market to appreciate the property. You're creating value by improving income or reducing expenses, which directly and immediately changes what the asset is worth.
It also works in the other direction. A $10,000 drop in NOI, from a tenant vacating, a lease expiring below market, or operating costs running higher than proforma, takes $142,000 off the value of that same property. Buyers and lenders underwrite to this math. Sellers and listing brokers often present the best-case version. The difference between what a seller presents and what a buyer can verify is where deals fall apart or where negotiating leverage lives.
How to Use This in Practice
When you’re evaluating a property, always ask for a trailing 12-month income and expense statement. Build the NOI yourself rather than accepting the seller’s pro forma. Verify every line item. Vacancy assumptions, management fees, and maintenance reserves are the three most commonly adjusted figures in a seller’s presentation.
When you’re selling, understand that a buyer is going to reunderwrite your NOI before they close. If your expenses are well-documented and your income is verifiable, you get fewer retrades and a smoother process. Surprises in the expense line are one of the most common reasons deals renegotiate after inspection.
Whether you’re underwriting your first acquisition or your fifteenth, NOI is where the conversation starts. Everything else follows from it.
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Schedule a free consultation with our team. We work with buyers and owners at every stage of the investment process.
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