Cap Rate vs Cash-on-Cash Return

Two numbers dominate real estate return math, and they answer different questions. Cap rate values the property itself — how much net operating income a price produces, free of any financing decision. Cash-on-cash measures your actual return as an investor — what the cash flow you receive represents against the cash you put in, financing included. Conflating the two is the most common error in real estate underwriting, and the difference is precisely leverage: the same property at the same cap rate can deliver very different cash-on-cash returns at different loan amounts and interest rates.

Cap rate: a property-level metric

The capitalisation rate is net operating income divided by price — expressed as a percentage. A $200,000 property generating $16,000 of NOI has an 8% cap rate. The cap rate is independent of how you pay for the property because NOI is before debt service; a cap rate is the return you would earn if you owned the property free and clear. It is a property valuation tool, used to compare similar properties on an unlevered basis, and the market average cap rate for a class of property is a proxy for how cheaply that class sells relative to income.

Cash-on-cash: an investor-level metric

The cash-on-cash return is the annual cash flow after debt service divided by the cash you actually invested — the down payment and closing costs. A property with $16,000 of NOI and a $10,000 annual mortgage payment returns $6,000 a year against maybe $50,000 of cash invested, a 12% cash-on-cash return. Notice that the cap rate (8%) and the cash-on-cash (12%) differ because financing sits between them — leverage amplifies the return when the loan cost is below the cap rate, and crushes it when the loan cost is above.

When to use which

Use the cap rate when valuing or comparing properties you are considering buying — it tells you if the asking price is in line with similar assets and lets you rank apples-to-apples. Use cash-on-cash when you have committed to a financing structure and want to know whether your actual invested cash returns enough. The two reinforce each other: a low cap rate at a high loan rate produces a negative cash-on-cash return, which the market shorthand calls negative leverage. Positive leverage — cap rate above loan rate — is when borrowing amplifies your return; negative leverage is when it subtracts from it.

                NOI: $16,000 | Price: $200,000 → 8% cap
Loan at 6%: cash-on-cash ≈ 12% (positive)
Loan at 10%: cash-on-cash ≈ 2% or less
Leverage helps when loan rate < cap rate
Leverage hurts when loan rate > cap rate
              

The limits of both

Neither number captures the full return on a real estate investment. Cash-on-cash ignores the equity paydown by the tenant every month and the appreciation over years, which together often exceed the annual cash flow. Cap rate is a snapshot of a single year and ignores future rent growth and value changes. The full return is an internal rate of return that accounts for all cash flows including the sale — harder to compute, but the only number that avoids the blind spots of either single-year metric. Use cap rate and cash-on-cash to filter and compare; use IRR to decide whether to hold.

Quick Answer

Cap rate values the property, cash-on-cash measures your return — which number matters depends on whether you are buying or holding.