The difference between net operating income vs net income is what each number leaves out. Net operating income (NOI) is what the building earns from running it, before loan payments, depreciation, capital projects and income taxes. Net income is what remains on the owner's books after all of those. NOI judges the property. Net income judges the owner's overall result.
Mixing them up is one of the most common mistakes we see in owner reports and deal packages. Here is how each one is built, where they split, and which one to use for which decision.
Net Operating Income vs Net Income Side by Side
NOI answers one question: how well does this building perform as a business, no matter who owns it or how it is financed? Net income answers a different one: after everything that touches this owner, what did the owner's entity earn on paper?
| Net operating income | Net income | |
|---|---|---|
| What it measures | The property's operating performance | The owner's bottom line |
| Rent and other income | Included | Included |
| Vacancy and credit loss | Deducted | Deducted |
| Operating expenses | Deducted | Deducted |
| Loan interest | Left out | Deducted |
| Loan principal | Left out | Not an expense (not deducted) |
| Depreciation | Left out | Deducted |
| Capital projects and reserves | Left out | Capital work is depreciated over time, not expensed |
| Income taxes | Left out | Deducted |
| Used for | Valuation, loan sizing, comparing buildings | Tax planning, the owner's financial statements |
For the full definition, see our glossary entry on net operating income. The short version: if you are comparing two buildings, or asking what a building is worth, you want NOI.
How the Waterfall Runs From Rent to Net Income
Think of the numbers as a waterfall. Each step takes something out, and where you stop decides which metric you are looking at.
- Gross potential rent. What the building would collect if every unit were rented at full market rent all year. See our guide to gross potential rent.
- Less vacancy and credit loss. Empty units, concessions and rent that never gets collected.
- Plus other income. Fees, laundry, parking, pet rent and utility reimbursements.
- Equals effective gross income (EGI). What the building actually brings in.
- Less operating expenses. The cost of running the building.
- Equals NOI. This is where the property-level story ends.
- Less debt service. Principal and interest on the loan.
- Less capital spending and reserve deposits. Roofs, boilers, flooring programs and the money you set aside for them.
- Equals cash flow before tax. The cash that can be distributed to owners.
- Then, for the books and the tax return: subtract depreciation and the interest portion of the loan payment (not the principal), then income taxes, and you arrive at net income.
The order is the point. NOI sits in the middle. Everything above it belongs to the property. Everything below it belongs to the owner and the loan.
An Illustrative Example With 40 Units
These numbers are made up to show the mechanics. Use your own.
Say a building has 40 units at $1,500 a month, and it is financed with a loan.
| Line | Annual amount |
|---|---|
| Gross potential rent (40 x $1,500 x 12) | $720,000 |
| Vacancy and credit loss (6%) | ($43,200) |
| Other income | $18,000 |
| Effective gross income | $694,800 |
| Operating expenses | ($280,000) |
| Net operating income | $414,800 |
| Debt service (interest $200,000, principal $60,000) | ($260,000) |
| Capital spending and reserves | ($12,000) |
| Cash flow before tax | $142,800 |
Now the books. Say the depreciable basis of the building, excluding land, is $5,000,000. Over 27.5 years that is about $181,818 a year of depreciation. Taxable income is roughly NOI of $414,800, less interest of $200,000, less depreciation of $181,818, which is about $32,982. If income taxes on that came to $7,000, net income would be about $25,982.
Same building, same year. NOI is $414,800. Cash flow is $142,800. Net income is $25,982. All three are correct, and each answers a different question. An owner who looked only at net income might think the building was barely earning. An owner who looked only at NOI might forget the loan takes more than half of it.
What Is Included in NOI and What Is Not
NOI is deliberately narrow, which is why it works for comparing buildings.
Included in NOI
- Rental income, net of vacancy, concessions and bad debt
- Other income such as fees, laundry, parking and utility reimbursements
- Payroll and on-site staffing
- Repairs and maintenance, and unit turn costs that are routine
- Utilities, insurance and property taxes
- Management fees and marketing
Not included in NOI
- Debt service. Interest and principal depend on how the owner financed the deal, not on the building.
- Depreciation. A non-cash accounting deduction.
- Capital expenditures and reserve deposits. Replacing a roof is not a normal operating cost, though it is real money. Many investors deduct a reserve line when they underwrite so the number is not flattering.
- Income taxes. These depend on the owner's tax situation.
- The owner's entity costs. Costs of the ownership entity itself, such as its accounting, legal and tax filings, do not belong to the building.
The tricky line is between repairs and capital work. Painting a unit is operating. Replacing every window is capital. Be consistent, and say how you treat the gray areas, because small changes in that line move NOI and therefore value. Our article on how to increase NOI covers where the real levers are.
NOI vs Cash Flow: Where Debt and Reserves Come In
Cash flow starts with NOI and then subtracts what the owner has to pay: loan payments and capital spending. In our example, NOI of $414,800 turns into cash flow of $142,800.
That gap is why NOI vs cash flow matters when you are buying. A building can have strong NOI and thin cash flow because the loan is large. Another can have modest NOI and healthy cash flow because it is lightly financed. Lenders measure this with a debt service coverage ratio, which compares NOI to the loan payment.
Use NOI to judge the building. Use cash flow to judge the deal.
NOI vs EBITDA
If you come from a business background, NOI looks a lot like EBITDA: earnings before interest, taxes, depreciation and amortization. The logic is close. Both strip out financing and non-cash charges to show operating performance.
The differences are practical. EBITDA is built for operating companies and is usually reported alongside amortization and the company's overall tax position. NOI is a property-level number with a specific set of rules: operating income and operating expenses of the real estate, nothing else. In apartment deals, buyers, lenders and appraisers talk about NOI. If someone quotes you EBITDA on a building, ask them to show the line items so you can see whether it matches NOI.
Which Number Should You Use for Which Decision?
Use NOI when you are valuing a building, setting a price, comparing two properties or judging how well a manager is running one. Value is commonly estimated by dividing NOI by a cap rate. Our NOI calculator lets you enter income and expenses and see NOI, your expense ratio and value at a cap rate.
Use cash flow when you are asking what you can distribute or whether the debt is safe.
Use net income when you are working with your accountant on taxes and financial statements. Depreciation and interest deductions are where the tax story lives. The IRS explains how depreciation of residential rental property works in Publication 527: it is spread over 27.5 years, it starts when the property is ready for rent, and land cannot be depreciated. Your tax advisor should confirm how this applies to you.
Getting a Clean NOI From Your Own Numbers
The most useful number in the chain is the one built from clean data. Pull a trailing 12 months of income and expenses, put each item in the right bucket, and strip out anything that belongs below the NOI line. Our T12 analysis template is set up for exactly this.
Then check what is hiding in the totals. One-time repairs that are really capital work, owner costs coded as building expenses, and management fees that were not charged can all make NOI look better or worse than it is. If you want a second set of eyes on how your building's numbers are reported, talk to us. Next Level Property Management manages apartments in Reno, Sparks, Carson City and Lake Tahoe, and clear owner reporting is a core part of that work.
