NOI Explained: How to Calculate Net Operating Income (and Increase It)

Learn what NOI is in commercial real estate, how to calculate it, what counts as an expense, and proven beginner-friendly ways to grow NOI.

What Is NOI?

NOI (Net Operating Income) is the property’s income after operating expenses, before debt service.

NOI = Effective Gross Income – Operating Expenses

NOI matters because it directly drives value in many CRE valuations.

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What Counts as Income?

Typical income sources (blend-friendly):

• base rent (retail/industrial/mixed-use)

• residential rent (multifamily component)

• reimbursements (tax/insurance/CAM)

• parking

• laundry

• storage

• signage

• pet fees (multifamily)

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What Counts as Operating Expenses?

Generally included:

• taxes, insurance

• repairs & maintenance

• utilities (if landlord-paid)

• management

• landscaping/snow/trash

• cleaning/common area maintenance

• admin/accounting/legal (property-level)

Generally excluded from NOI:

• mortgage payments (principal/interest)

• depreciation

• income taxes

• major capital expenditures (capex) — often treated separately

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NOI vs Cash Flow (Beginner Clarity)

• NOI: before debt

• Cash flow: after debt

A property can have strong NOI and poor cash flow if financing is expensive.
Or modest NOI and strong cash flow with favorable financing.

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How to Calculate NOI (Simple Example)

• Scheduled rent: $240,000

• Vacancy (5%): -$12,000

• Other income: $6,000
  Effective gross income: $234,000

Operating expenses: -$110,000
NOI: $124,000

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The 5 NOI Levers (Beginner-Friendly Framework)

You only have five real levers:

1. Raise rents (when leases roll or units turn)

2. Improve occupancy (lease vacant space, reduce churn)

3. Add other income (parking, billbacks, storage, laundry, fees)

4. Reduce controllable expenses (rebid, efficiency, preventive maintenance)

5. Improve lease structure (shift expenses to tenants when appropriate)

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How to Increase NOI (By Property Type — Blend Strategy)

Retail

Ways to increase NOI:

• replace weak tenants with stronger demand drivers

• fix signage/visibility and lease faster

• strengthen CAM recoveries and billing

• renew tenants early to reduce vacancy risk

Beginner watch-outs:

• tenant concentration risk

• co-tenancy clauses (can reduce rent if anchor leaves)

Industrial / Flex

Ways to increase NOI:

• raise below-market rents at renewal

• add small upgrades that increase functionality (lighting, doors)

• improve expense recovery if leases allow

• add structured annual increases

Beginner watch-outs:

• environmental history

• specialized buildouts that limit tenant pool

Mixed-Use

Ways to increase NOI:

• residential unit upgrades at turnover (rent bumps)

• tighten expense allocation (who pays what)

• professionalize management and collections

Beginner watch-outs:

• different components behave differently (retail leasing ≠ res leasing)

• financing can be more complex

Multifamily 5+

Ways to increase NOI:

• renovate units at turnover to earn rent premiums

• reduce utility waste (submetering where allowed, efficiency)

• implement consistent late fee/collections policy

• reduce maintenance calls with preventive upgrades

Beginner watch-outs:

• underestimating turns and maintenance

• local regulation constraints

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NOI Growth → Value Growth (Why This Matters)

In many markets, value can be approximated as:

Value ≈ NOI ÷ Cap rate

So if you increase NOI by $25,000 and cap rate is 7%: Value increase ≈ $25,000 ÷ 0.07 = $357,143

This is why operational improvements can create meaningful equity.

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Beginner Mistakes with NOI

1. Assuming seller expenses are real (verify taxes, insurance, utilities)

2. Ignoring vacancy and bad debt

3. Treating capex as an operating expense (it’s different)

4. Using pro forma NOI as if it’s guaranteed

5. Not budgeting for leasing/TI/LC (commercial)

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NOI Improvement Checklist (Practical)

If you buy a property tomorrow, start here:

Revenue

• audit rents vs market

• review lease escalations and renewal timing

• identify quick “other income” adds

Occupancy

• create a leasing plan (broker, marketing, signage, outreach)

• reduce churn with proactive tenant communication

Expenses

• rebid top 3 contracts

• implement preventive maintenance

• check utilities and billing accuracy

Lease structure

• ensure reimbursements are billed correctly

• tighten renewals to improve predictability

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FAQs

Does NOI include capital expenditures?
Typically no. Capex is usually separate.

Is higher NOI always better?
Higher NOI is good—if it’s sustainable and not created by deferring maintenance.

How fast can NOI increase in value-add?
Depends on lease roll, market demand, and capex. Underwrite conservatively.

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