Net Operating Income

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---
schema: foundry-doc-v1
title: "Net Operating Income"
slug: net-operating-income
category: industry
type: topic
content_type: topic
quality: complete
short_description: "The primary operating metric in commercial real estate: gross income less operating expenses, before debt service, depreciation, and capital expenditure."
status: active
audience: customer-woodfine
bcsc_class: current-fact
language_protocol: PROSE-TOPIC
last_edited: 2026-06-29
editor: woodfine-editorial
paired_with: industry/net-operating-income.es.md
---

Net operating income (NOI) is the foundational metric of commercial real estate economics. It
measures the income a property generates from operations after deducting operating expenses but
before debt service, depreciation, income tax, and capital expenditure. NOI sits at the core
of property valuation, lender underwriting, and investor return analysis.

## Key takeaways

- NOI equals gross potential income less vacancy allowance and operating expenses; it excludes
  debt service, capital expenditure, and depreciation — making it a property-level, not
  investor-level, measure.
- Two NOI variants are in common use: cash NOI, which captures actual cash flows, and GAAP NOI,
  which applies straight-line rent recognition and amortisation of lease incentives — the two
  figures diverge when lease terms include significant free-rent periods or tenant improvement
  allowances.
- Because the capitalisation rate is applied to NOI to derive property value, a given change
  in NOI produces a proportional change in assessed value at a constant cap rate — the leverage
  effect of NOI on valuation is direct and linear.

## Construction of NOI

NOI is built from the income statement of the property itself.

**Gross potential income (GPI)** is the revenue the property would generate at full occupancy
at market rents. It represents the theoretical ceiling of operating income.

**Vacancy and credit loss** is deducted from GPI to produce effective gross income (EGI).
The vacancy allowance reflects the realistic long-run occupancy rate for the asset class and
market; credit loss captures the historical rate of tenant defaults and non-payment. Together
they convert the theoretical ceiling to a market-realistic revenue figure.

**Operating expenses** are deducted from EGI to arrive at NOI. Operating expenses include
property taxes, insurance, utilities, property management fees, maintenance and repair, and
general and administrative costs. Capital expenditure — roof replacement, mechanical upgrades,
structural improvements — is excluded from operating expenses and from the NOI calculation,
though it figures separately in investment return analysis.

## Cash NOI versus GAAP NOI

Two measurement conventions are standard in institutional real estate practice.

**Cash NOI** records revenue as cash received and expenses as cash paid. Free-rent concessions
and tenant improvement allowances are reflected in the period in which the economic effect
occurs. Cash NOI is the figure most directly comparable across properties and most useful for
debt service coverage analysis.

**GAAP NOI** applies the revenue recognition requirements of IFRS 16 (or its ASPE equivalent),
which require straight-line recognition of lease income over the full lease term. A lease that
provides six months of free rent in year one followed by escalating cash payments in subsequent
years produces a GAAP rent figure that differs from cash rent in each year of the term. Similarly,
tenant improvement allowances paid at lease commencement are amortised over the lease term under
GAAP rather than expensed in full when paid.

The divergence between cash NOI and GAAP NOI can be material in the first years of a new lease
or following a significant capital investment in tenant fit-out. For properties with long-dated
leases and substantial tenant improvement programs, the two figures can diverge by ten to fifteen
percent in any given year.

For financial reporting purposes under IAS 40, the property's value is assessed on its ability
to generate income, and the valuation model incorporates the capitalisation of stabilised NOI
— typically the cash NOI of the property at normal occupancy.

## NOI and property valuation

The direct capitalisation method links NOI to property value through the capitalisation rate:

**Property value = NOI ÷ capitalisation rate**

At a stabilised NOI of $1,000,000 and a market capitalisation rate of 5.0%, the indicated
value is $20,000,000. The same property with a 5.5% cap rate would indicate $18,182,000 — a
reduction of approximately $1.8 million from a 50-basis-point shift in the rate alone. NOI
held constant, the sensitivity of value to the cap rate is the reason cap rate analysis is
central to property investment and disposition decisions.

## NOI in lender underwriting

Commercial mortgage lenders underwrite to the debt service coverage ratio (DSCR), which is NOI
divided by total annual debt service (principal plus interest). A property generating $1,000,000
of NOI servicing $750,000 of annual debt payments produces a DSCR of 1.33×. Most institutional
lenders require a minimum DSCR of 1.20× to 1.30× at origination; the debt quantum is constrained
by this test rather than by the property's appraised value alone.

A borrower who increases NOI — through occupancy improvement, rent escalation, or operating
expense reduction — creates additional debt capacity at the same coverage requirement, enabling
refinancing or additional leverage without additional equity.

## Limitations of NOI as a standalone metric

NOI does not capture capital expenditure, making it insufficient as a full assessment of
investment return. A property with high NOI but significant deferred maintenance, requiring
capital expenditure to sustain occupancy, carries hidden costs that reduce actual investor
cash flow below the NOI figure.

The distinction between maintenance capital expenditure — expenditure required to preserve
the existing income stream — and improvement capital expenditure — expenditure intended to
increase income — is material to return analysis. Only improvement capex is additive to future
NOI; maintenance capex is a cost of sustaining the existing income level.

Adjusted funds from operations (AFFO), which deducts normalised maintenance capital
expenditure from funds from operations, is the institutional standard for assessing the
sustainable distributable cash flow of a real property holding structure.

## See also

- [[capitalization-rate]] — how NOI is converted to an implied property value through the
  capitalisation rate
- [[interest-rate-transmission]] — how changes in financing costs interact with NOI to
  affect investment returns and property valuations