Cap Rate vs Cash-on-Cash Return: Which Metric Matters More?
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Cap rate and cash-on-cash return both claim to measure a rental property's return, and beginners often use them interchangeably. They answer different questions: cap rate measures the property, cash-on-cash measures your deal. The gap between them is exactly the effect of your financing — and reading that gap is one of the most useful skills in deal analysis.
Cap rate: the property's own yield
Cap rate = net operating income (NOI) ÷ purchase price. NOI is rent minus all operating expenses but before any mortgage payments. Because financing is excluded, two investors with completely different loans compute the same cap rate on the same building — which is what makes it the standard tool for comparing properties and markets.
A $400,000 property with $25,320 of NOI has a 6.3% cap rate, whether you buy it in cash or with 90% leverage.
Cash-on-cash: your deal's yield
Cash-on-cash = annual pre-tax cash flow ÷ total cash invested. This one includes the mortgage: cash flow is what remains after debt service, and the denominator is your actual money in the deal, not the property price.
The same $400,000 property bought with $80,000 down at 6% interest cash-flows about $2,300 per year — a 2.9% cash-on-cash. Bought in cash, it yields the full 6.3%. Same building, radically different personal returns.
The gap is leverage speaking
Compare the two numbers and you learn something immediate: when your loan's effective cost is below the cap rate, leverage amplifies your return and cash-on-cash exceeds the cap rate. When borrowing costs more than the property yields — as in the example above, borrowing at 6% against a 6.3% cap with amortization included — leverage suppresses your cash return. Investors call this positive or negative leverage, and it flips exactly where mortgage rates cross cap rates. That crossover is why deals that worked at 4% interest stopped working at 7%.
Which one should drive the decision?
Use them in sequence, not in competition:
- Screening a market or comparing properties → cap rate, because it strips out financing noise.
- Deciding whether this deal is worth YOUR capital → cash-on-cash, because you invest cash, not NOI.
- Negotiating price → cap rate again: value = NOI ÷ market cap rate, so every dollar of NOI you can prove is worth $15–25 of price.
- Neither metric counts principal paydown, appreciation, or tax effects — for the full picture over time you need a total-return projection.
Cap Rate Calculator