Cap Rate vs. Cash-on-Cash vs. IRR: Which Return Number Should Drive the Decision?

Ask three property investors for "the return" on a deal and you will get three numbers, all correct, none comparable. Cap rate, cash-on-cash and IRR are not competing answers to one question — they are answers to three different questions, and the mistake that costs money is using the wrong one at the wrong moment.

What is cap rate, and what does it ignore?

Capitalisation rate is net operating income divided by property value or purchase price. A property producing 240,000 USD in NOI at a 4,000,000 USD price has a 6% cap rate. It is the unlevered yield on the asset itself.

What it deliberately ignores is financing. Cap rate is independent of how the deal is capitalised — debt, equity split, interest rate, amortisation all sit outside the formula. It also ignores time: it is a snapshot of one year, usually year one, with no view of what happens after.

That is a feature, not a flaw. Because it strips out financing, cap rate is the only one of the three that compares properties rather than deals. Two buyers with different debt terms looking at the same building will compute the same cap rate. It is a pricing and market-benchmarking tool.

Use it for: pricing an asset, comparing it against comparable sales, sanity-checking a market. Do not use it for: deciding whether your equity is well spent.

What is cash-on-cash return, and what does it ignore?

Cash-on-cash return is annual pre-tax cash flow after debt service, divided by total equity invested. If you put 1,000,000 USD of equity into a deal and it throws off 70,000 USD after the mortgage is paid, that is a 7% cash-on-cash return.

This is the levered mirror of cap rate. It is affected directly by how much leverage you use, which is exactly why it answers the question cap rate cannot: what does my money actually earn each year?

What it ignores is everything that is not current cash. No appreciation, no principal paydown, no sale proceeds, no tax treatment, no time value of money. It also ignores next year — a single-year cash-on-cash figure is a photograph of a moving object, which is why it is best tracked year by year rather than quoted once.

Use it for: judging whether the financing structure produces the distributions you need, and whether the deal feeds you while you hold it. Do not use it for: comparing a stabilised asset against a value-add one. It will lie to you, and we will get to why.

What is IRR, and what does it ignore?

Internal rate of return is the annualised discount rate at which everything you put in equals everything you get back — operating cash flow, capital expenditure, and sale proceeds — over the full hold period. It is the only one of the three that takes the time value of money seriously.

IRR's strength is completeness: it eats the entire investment journey, interim distributions and exit included, and returns a single number. Its weakness is that completeness requires assumptions. An IRR is only as honest as its exit cap rate, its rent growth curve, and its capex schedule — all of which are forecasts about a future nobody has seen. A projected IRR is an opinion expressed in decimal places.

It is also sensitive to timing in ways that flatter certain deals. Money returned early lifts IRR sharply even if the total profit is modest, which is why IRR should always be read alongside equity multiple. A 20% IRR returning 1.3x and a 16% IRR returning 2.1x are very different investments.

Use it for: evaluating total-period performance and comparing deals with different hold periods and cash flow shapes. Do not use it for: anything, without seeing the assumptions and the equity multiple next to it.

Why can one deal look strong on one metric and weak on another?

Because the three metrics disagree by design, and their disagreement is the actual information.

Consider a stabilised, fully leased building: healthy cap rate, healthy cash-on-cash, unremarkable IRR — there is no upside left to create. Now consider a half-empty value-add asset: terrible cap rate today, near-zero or negative cash-on-cash for two years, and potentially an excellent IRR if the lease-up plan lands. Neither is a better deal in the abstract. They are different products for different investors with different liquidity needs.

The disagreement tells you what kind of deal you are looking at. When cap rate is strong but cash-on-cash is weak, your financing is eating the asset. When cash-on-cash is strong but IRR is weak, you are being paid well to hold something that will not be worth more later. When IRR is strong but cash-on-cash is negative for years, you are underwriting a story — check whether you can survive it.

Which metric should drive the decision?

None of them alone. The practical sequence most disciplined investors run is roughly:

• Cap rate first — is this asset priced sensibly against the market? If not, stop here.
• Cash-on-cash second — does the proposed financing produce cash I can live on, and does it cover debt service with room to spare?
• IRR last — over the full hold, with the exit assumptions written down and stress-tested, is the total journey worth the equity and the risk?

The rule underneath all three: never accept a return metric without its inputs. A cap rate without the NOI build is unverifiable. A cash-on-cash without the debt terms is unverifiable. An IRR without the exit assumption is a marketing number.

How do these belong on a live dashboard?

Together, per asset and per portfolio, with the assumption layer visible.

Most investor reporting shows a single quarterly figure and buries the drivers in a spreadsheet nobody opens. The more useful build shows cap rate against the NOI that produced it, cash-on-cash by year rather than as a single quote, and IRR with its exit cap rate exposed as an adjustable input — so that "what if we exit 50bps wider?" is a slider, not a two-day modelling exercise.

The NOI feeding all of this has to be real, which is why the rent roll layer matters more than the return layer. We covered the gap that quietly distorts it in Physical vs Economic Occupancy: The Rent Roll Gap That Distorts Your NOI, and the wider metric set in The Real Estate Portfolio Dashboard: KPIs Every Property Investor Should Track.

FAQ

Can cash-on-cash return be higher than cap rate? Yes — that is positive leverage. When your borrowing cost is below the property's unlevered yield, debt amplifies the return on your equity. When the reverse is true, cash-on-cash falls below cap rate and leverage is working against you. That comparison is a fast read on whether your debt makes sense.

Is a higher cap rate always better? No. Cap rate prices risk. A high cap rate usually signals a weaker market, shorter leases, or worse tenant credit — the market is demanding more yield for a reason. Buying the highest cap rate available is a strategy for accumulating problems.

Does cap rate include the mortgage? No. NOI is calculated before debt service. If someone gives you a cap rate that nets out the mortgage payment, they have computed something else and called it a cap rate.

What is a good IRR for a property investment? It depends entirely on risk profile, hold period and market — a core stabilised asset and an opportunistic development have no business sharing a benchmark. Rather than chase a target number, check the exit cap rate assumption and the equity multiple. Those two reveal more than the IRR headline does.

Why do sponsors lead with IRR? Because it is the largest, most flexible number in the set and the most sensitive to assumptions they control. That is not automatically bad faith — IRR genuinely is the most complete measure. But it is the number most worth interrogating, and the first place to ask for the model.

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Sifra builds live, investor-grade dashboards for property portfolios — NOI, occupancy, arrears and returns on one view, with the assumptions visible instead of buried. See the Property vertical, or get a free mock dashboard built on your own portfolio structure.