NOI: the operating engine
Net operating income starts with property revenue and subtracts normal operating expenses. It generally excludes financing payments, income taxes, depreciation and major capital expenditures. The goal is to isolate the performance of the real estate before the owner’s financing structure.
Illustrative example: A property collects $120,000 of effective annual income and has $45,000 of operating expenses. The illustrative NOI is $75,000.
Cap rate: NOI relative to value
If that same property is purchased for $1,500,000, the simple going-in cap rate in the example is 5%: $75,000 divided by $1,500,000.
Cap rate does not tell you the investor’s leveraged return. Two buyers can purchase the same property at the same cap rate and experience very different cash returns because their loans, reserves and capital plans differ.
Cash-on-cash: cash flow relative to cash invested
Cash-on-cash return looks at annual pre-tax cash flow after financing relative to the investor’s cash in the deal. That denominator can include down payment and other acquisition cash depending on the methodology used.
If annual pre-tax cash flow is $24,000 and the investor has $400,000 of cash invested, the illustrative cash-on-cash return is 6%.
IRR: timing matters
Internal rate of return evaluates a sequence of cash flows over time. It can include acquisition cash, annual distributions, renovation spending and a future sale. Because the result depends heavily on the exit value and timing assumptions, IRR can look precise while being very sensitive to the inputs.
Why investors misuse the metrics
- Calling gross rent “NOI” overstates operating performance.
- Using a cap rate while ignoring deferred capital needs can mislead.
- Cash-on-cash can look strong because leverage is high.
- IRR can look excellent because the assumed resale price is aggressive.
Use a stack, not one metric
A defensible underwriting view can show revenue, operating expenses, NOI, recurring capital reserves, debt service, pre-tax cash flow, cash-on-cash return and scenario-based exit results. Then stress-test occupancy, rent, costs, financing and sale assumptions.
FAQ
Which metric is most important?
It depends on the question. NOI measures operations, cap rate relates operations to value, cash-on-cash measures leveraged cash yield, and IRR incorporates time and exit assumptions.
Is a high cap rate always better?
No. Higher apparent yield can reflect greater risk, weaker location, capital needs, tenant risk or optimistic expense assumptions.
Should appreciation be included in underwriting?
It can be modeled as a scenario, but it should not be required for the property to appear viable unless the investor knowingly accepts that risk.
Investment note: Examples are illustrative and not investment, tax or legal advice. Verify rents, expenses, financing, rules and exit assumptions for the specific property.
