The direct answer
Cap rate, ROI, IRR and cash-on-cash return answer different questions. Cap rate measures property NOI relative to value, cash-on-cash measures annual equity cash flow relative to cash invested, ROI summarizes gain relative to investment, and IRR is a time-sensitive multi-period return measure.
Use cap rate for property-level income yield
Cap rate excludes financing and focuses on NOI relative to price or value. It is useful for comparing income-producing property economics when NOI definitions are consistent, but it does not incorporate the investor’s loan, future cash-flow timing or sale proceeds.
To apply the approach to an editable scenario, use the Property Comparison Calculator. For the neighboring question, explore Rental Property Calculator.
Use cash-on-cash for annual equity cash income
Cash-on-cash incorporates debt service through the cash-flow numerator and financing through the cash-invested denominator. It is easy to interpret but represents a period rather than the full holding cycle. Changing leverage can change the ratio without changing the property NOI.
Use multi-period metrics for multi-period questions
ROI can summarize total gain but may ignore when cash arrives unless the definition explicitly handles timing. IRR solves for the discount rate that sets a sequence of dated or periodic cash flows to zero net present value. IRR is sensitive to timing and modeled exit cash flows and should not be treated as interchangeable with annual cash-on-cash.
Worked example
A $500,000 property with $35,000 NOI has a 7% cap rate. If financing leaves $12,000 annual cash flow on $120,000 cash invested, cash-on-cash is 10%. A five-year ROI or IRR would additionally require the intervening cash flows and a modeled exit; neither can be inferred from the 7% or 10% alone.
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Common mistakes and limitations
Do not compare percentages with different numerators, denominators and time horizons as if they were the same return measure.
Comparison does not rank risk, location, liquidity, taxes, financing quality or future appreciation.
Frequently asked questions
Which metric is best?
There is no universal best metric; choose the one that matches the decision and use complementary measures for omitted risks.
Does cap rate equal IRR without debt?
No. Cap rate is a one-period NOI-to-value ratio, while IRR depends on a sequence of cash flows and timing.
Sources and further reading
The article’s examples are illustrative arithmetic. The references below provide context for operating, valuation or transaction concepts; they do not endorse the assumptions or the calculator.
- Office of the Comptroller of the Currency — Comptroller's Handbook — Commercial Real Estate LendingNOI, direct capitalization, cap-rate valuation and DCF concepts for commercial real estate.
Read our editorial policy for the scope of these educational methods.