How to Calculate NOI (Net Operating Income) for Rental Property

What Is Net Operating Income (NOI)?

Net Operating Income (NOI) measures the total annual revenue generated by a rental property minus all necessary operating expenses. It evaluates the property's operational profitability independently of how you finance it or how your personal income taxes are structured.

Because NOI excludes mortgage payments, capital improvements, and personal income tax, it provides an objective baseline to compare the performance of different properties. Whether a building is bought with 100% cash or an 80% loan-to-value mortgage, its NOI remains identical.

The Net Operating Income Formula

Calculating NOI requires two core components: Effective Gross Income and Operating Expenses.

NOI = Effective Gross Income - Operating Expenses

To break this down into each practical step:

1. Potential Gross Income (PGI): The total rental revenue if the property operates at 100% occupancy with zero missed rent.
2. Other Income: Additional revenue from storage fees, parking, laundry, pet rent, or utility reimbursements.
3. Vacancy and Credit Loss: The income lost when units are empty or tenants fail to pay.
4. Effective Gross Income (EGI): Potential Gross Income + Other Income - Vacancy and Credit Loss.
5. Operating Expenses (OpEx): The day-to-day recurring costs required to operate and maintain the property.

What to Include in NOI (And What to Exclude)

Getting an accurate NOI figure depends on categorizing income and expenses correctly. Small errors—such as including mortgage principal or misclassifying renovations—distort your numbers.

Included in Revenue

• Gross scheduled rental income
• Parking or garage rental fees
• Storage unit charges
• On-site laundry or vending revenue
• Non-refundable pet fees and monthly pet rent
• Tenant utility chargebacks

Included in Operating Expenses (OpEx)

• Property management fees
• Property taxes
• Landlord insurance policies
• Routine repairs and ongoing maintenance (plumbing fixes, lawn care, pest control)
• Landlord-paid utilities (water, sewer, trash, common area power)
• Advertising and tenant acquisition costs
• HOA or condo fees
• Legal and accounting fees directly tied to operating the property

For a detailed breakdown of recurring operational costs, review our rental property expenses checklist.

Excluded from NOI

To keep NOI an unleveraged operational metric, exclude the following items:

• Mortgage Payments (Debt Service): Both principal and interest payments depend on individual financing terms, not property performance.
• Capital Expenditures (CapEx): Large, multi-year structural replacements (such as a new roof, HVAC replacement, or foundation overhaul). To understand how these differ from routine repairs, read our guide on CapEx vs OpEx for rental properties.
• Depreciation and Amortization: Non-cash accounting deductions designed for tax reporting.
• Personal Income Taxes: State or federal tax liabilities tied to your personal bracket.

Step-by-Step NOI Calculation (With Example)

Consider an example single-family rental property with the following annual profile:

Example Scenario

• Monthly Rent: $2,200 ($26,400 per year)
• Pet Rent: $50 per month ($600 per year)
• Expected Vacancy Rate: 5%
• Property Management: 8% of collected rent
• Property Taxes: $2,800 per year
• Landlord Insurance: $1,200 per year
• Repairs & Maintenance: $1,800 per year
• HOA Dues: $600 per year

Step 1: Calculate Effective Gross Income (EGI)

First, sum all potential revenue sources and deduct the vacancy allowance:

Potential Gross Revenue = $26,400 + $600 = $27,000 Vacancy Loss (5% of $27,000) = $1,350 Effective Gross Income = $27,000 - $1,350 = $25,650

Step 2: Total the Operating Expenses

Next, aggregate all operating costs for the year:

• Property Management (8% of $25,650): $2,052
• Property Taxes: $2,800
• Insurance: $1,200
• Repairs & Maintenance: $1,800
• HOA Fees: $600

Total Operating Expenses = $2,052 + $2,800 + $1,200 + $1,800 + $600 = $8,452

Step 3: Compute NOI

Subtract total operating expenses from the effective gross income:

NOI = $25,650 - $8,452 = $17,198

The property generates $17,198 in annual Net Operating Income.

NOI vs. Net Cash Flow vs. Taxable Income

Many landlords confuse NOI with net cash flow or taxable net income. While all three measure financial performance, they answer different questions.

Why the Difference Matters

Using the previous example where NOI was $17,198:

• If your annual mortgage payment (principal + interest) is $12,000 and you set aside $2,000 for CapEx reserves, your Net Cash Flow is $3,198 ($17,198 - $12,000 - $2,000).
• For tax purposes, you do not deduct the principal portion of your mortgage or full CapEx purchases immediately, but you do deduct depreciation and mortgage interest.

If you want to explore the relationship between property returns and pocketed cash, see our comparison on cap rate vs cash flow.

How NOI Is Used in Real Estate Decisions

1. Calculating Capitalization Rate (Cap Rate)

NOI is the primary numerator used to find the capitalization rate of an asset:

Cap rate = (NOI / property purchase price) x 100

Using our example property with an NOI of $17,198 and an assumed purchase price of $260,000:

Cap rate = ($17,198 / $260,000) x 100 = 6.61%

You can run your own property numbers directly using our free cap rate calculator.

2. Sizing Commercial and Portfolio Mortgages

Lenders use NOI to determine the Debt Service Coverage Ratio (DSCR):

DSCR = NOI / annual debt service

If your annual debt service is $12,000 and NOI is $17,198, your DSCR is 1.43 ($17,198 / $12,000). Most commercial lenders require a DSCR of at least 1.20 to 1.25 to ensure the property covers its debt with a safety buffer.

3. Estimating Property Value

If you know the prevailing market cap rate for comparable rental properties in your area, you can estimate a property's market value based on its NOI:

Property Value = NOI / Market Cap Rate

If the prevailing cap rate in your neighborhood is 6.0% and your property generates $18,000 in NOI, the estimated value is:

$18,000 / 0.06 = $300,000

4 Practical Ways to Improve Your Property's NOI

Because NOI is determined strictly by revenue and operating costs, you can improve it in two ways: raising revenue or cutting unnecessary operating expenses.

1. Eliminate Billing Leaks: Charge back utilities where legally permitted, introduce separate fees for storage or parking, and audit recurring vendor contracts annually.
2. Reduce Turnaround Times: Minimizing vacancy between leases keeps your Effective Gross Income close to its potential ceiling.
3. Shop Insurance Policies Regularly: Insurance premiums often creep upward over time. Getting competing quotes every 12 to 24 months can reduce fixed OpEx.
4. Maintain Preventive Schedules: Servicing HVAC units and clearing gutters prevents small maintenance items from escalating into expensive operational call-outs.

Track Your Property's Real Profitability

Knowing your Net Operating Income tells you how well your asset runs, but keeping track of changing rents, unexpected repairs, and recurring management fees across spreadsheets can get messy.

Propertira gives small landlords a clean, automated monthly cash-flow picture per property. Track recurring expenses, spot revenue leaks, and know exactly how your portfolio performs without complex spreadsheets.

See what your rentals actually make