Does NOI include the mortgage payment?

No. NOI is calculated before debt service, so principal and interest on your loan are excluded. This keeps NOI independent of how the property is financed, which is why two buyers with different loans still share the same NOI on the same building.

What is the difference between NOI and cash flow?

NOI is income after operating expenses but before financing. Cash flow is what remains after you also subtract debt service and any capital expenditures. A property can have positive NOI but negative cash flow if the loan payment is large relative to income.

Are capital expenditures part of NOI?

No. Capex covers major replacements like a roof, HVAC system, or repiping that extend the asset's life. Those are excluded from NOI. Only routine, recurring repairs and maintenance belong in operating expenses.

How does NOI affect a property's value?

Value is driven by NOI and the market cap rate: divide NOI by the prevailing cap rate to estimate an income-based value. Because value tracks NOI, increasing rents or cutting operating expenses can raise the property's worth even without a change in the market.

What NOI do I need to qualify for a DSCR loan?

There is no single number. Lenders divide the property's income by the annual loan payment and look for a minimum DSCR, often around 1.20. The higher your NOI relative to the payment, the larger the loan you can support. Save Financial can run your property's numbers and match them to a DSCR program.

Should I use current rents or market rents to calculate NOI?

Use actual current rents for underwriting a purchase, and hold vacancy and expenses realistic. Market rents are useful to project upside after you improve or re-lease units, but qualifying a loan and pricing a deal on optimistic future rents is a common and costly mistake.

Investor · 8 min read

Net Operating Income (NOI) Explained for Investors (2026)

By Mike Basti·August 13, 2026

Net operating income (NOI) is what a rental property earns after operating expenses but before financing. The formula is NOI = Gross Operating Income (rental income minus vacancy) minus Operating Expenses. NOI deliberately excludes your mortgage payment (debt service), income taxes, depreciation, and capital expenditures, which makes it the cleanest way to compare properties and the number that drives cap rate, valuation, and DSCR loan qualification.

What NOI is (and what it is not)

Net operating income measures the profit a property produces from operations alone. It answers a single question: after you collect the rent and pay the bills required to keep the building running, how much cash is left before you make a loan payment or pay taxes?

NOI is a property-level number, not an owner-level number. Two investors can buy the same triplex, one paying cash and one financing 75 percent, and the property still has the same NOI. What changes between them is cash flow after debt service, not NOI. That is exactly why lenders, appraisers, and serious buyers lean on it: NOI strips out the parts of a deal that depend on how you personally structure or tax it, leaving a clean measure of the asset itself.

The NOI formula

The calculation runs in two stages. First you build Gross Operating Income, then you subtract operating expenses.

Gross Operating Income (GOI) = Gross Potential Rent + Other Income (laundry, parking, storage, pet fees) minus Vacancy and Credit Loss.

NOI = Gross Operating Income minus Operating Expenses.

Vacancy is estimated as a percentage of gross rent, typically 4 to 8 percent depending on the submarket, even when the building is fully leased today. Underwriting a property at 100 percent occupancy is one of the fastest ways to overpay, because no rental holds full occupancy forever between turnovers.

What counts as operating income

Operating income is every recurring dollar the property generates in the normal course of business. For a residential rental that means:

Scheduled rent from each unit
Parking, garage, or carport fees charged separately
Coin or app-based laundry income
Storage unit rent
Pet rent and recurring amenity fees
Reimbursed utilities where the tenant pays the landlord back

One-time or non-operating items do not belong here. Insurance settlements, proceeds from selling an appliance, or a mortgage refinance cash-out are not operating income and should never be blended into NOI.

What counts as an operating expense

Operating expenses are the ongoing costs required to run and maintain the property at its current condition. The common line items:

Property taxes
Property and liability insurance
Property management fees (typically 6 to 10 percent of collected rent)
Repairs and routine maintenance
Utilities the owner pays (water, sewer, trash, common-area electric)
Landscaping and pest control
HOA dues, where applicable
A reserve for turnover and small recurring replacements

Notice what is missing. The mortgage payment is not on this list.

What NOI excludes: debt service, capex, taxes, depreciation

Four costs are real to you as an owner but sit outside NOI on purpose:

Debt service (principal and interest on your loan). NOI is calculated before financing so the number stays independent of how the deal is leveraged.
Capital expenditures (capex). A new roof, a full HVAC replacement, or a repiping job are capital improvements that extend the asset's life, not routine operating costs. Small recurring repairs stay in NOI; big-ticket replacements do not.
Income taxes. These depend on your personal or entity tax situation, not the property.
Depreciation. A paper deduction with no cash outflow, so it never touches NOI.

Blurring these lines is the single most common way investors and even some listing brokers inflate NOI to make a deal look stronger than it is.

Worked example: a California triplex

Here is a full operating statement for a stabilized triplex renting at 2,400, 2,300, and 2,200 dollars per month across three units. Annual gross potential rent is 83,400 dollars, plus 1,800 dollars of annual parking income.

Line item	Annual amount
Gross potential rent (3 units)	83,400
Parking income	1,800
Vacancy and credit loss (5%)	-4,170
Gross Operating Income	81,030
Property tax	-11,250
Insurance	-3,600
Property management (8%)	-6,482
Repairs and maintenance	-4,000
Utilities (owner-paid water, sewer, trash)	-3,900
Landscaping and pest control	-1,400
Reserves	-1,600
Total operating expenses	-32,232
Net Operating Income (NOI)	48,798

The mortgage payment appears nowhere on this statement. Whether the buyer finances the purchase or pays cash, the NOI is 48,798 dollars.

Why NOI matters: cap rate, valuation, and DSCR

NOI is the input to nearly every metric investors use to price and finance a property.

Cap rate = NOI divided by purchase price. Using the triplex above, a 1,000,000-dollar price implies a 4.88 percent cap rate. Flip it around and NOI drives valuation directly: divide NOI by a market cap rate and you get an income-based value. If comparable triplexes trade at a 5 percent cap, the income supports a value near 976,000 dollars (48,798 divided by 0.05).

DSCR (debt service coverage ratio) compares income to the loan payment. This is where NOI connects straight to how much you can borrow. Lenders divide the property's income by its annual debt service; a DSCR of 1.20 means the property earns 1.20 dollars for every 1.00 dollar of loan payment. Higher NOI supports a larger loan or a stronger ratio.

How NOI connects to DSCR loan qualification

A DSCR loan sizes the mortgage from the property's income rather than your personal income. Instead of underwriting your W-2s and tax returns, the lender looks at whether the rent covers the payment. The property has to carry itself.

Using the triplex NOI of 48,798 dollars, if a lender requires a minimum DSCR of 1.20, the maximum annual debt service the property supports is roughly 40,665 dollars (48,798 divided by 1.20), which then backs into a loan amount at the quoted rate and term. Raise the NOI (higher rents, lower expenses) and the property qualifies for more leverage. Note that some DSCR lenders use a slightly different income basis than a full NOI, but the principle is identical: income versus debt service is what sizes the loan.

Save Financial arranges DSCR loans for California investors that qualify on the property's income, not your tax returns. If the numbers on your operating statement work, the deal works, whether you own one triplex or a growing portfolio held in an LLC.

About this article: Save Financial publishes California mortgage and real-estate-investing guides. We are a California-licensed mortgage brokerage (NMLS #377740, DRE #01875766) serving all 58 counties, specializing in DSCR and hard money loans for investors. For a real quote, apply online or call 949-379-5320.