The direct answer
Cap rate compares NOI with property price or value before financing. Cash-on-cash compares annual after-debt cash flow with contributed cash. The first describes property income economics; the second includes the effect of financing and the investor’s cash basis.
Follow the two calculation paths
Both paths can begin with the same operating income. For cap rate, stop at NOI and divide by property price. For cash-on-cash, deduct the debt-service assumption and divide by invested cash. These different numerators and denominators explain why the two percentages need not match. A single label such as yield is insufficient to tell you which relationship is being quoted.
To apply the approach to an editable scenario, use the Cap Rate Calculator. For the neighboring question, explore Cash-on-Cash Return Calculator.
Change financing without changing the operating property
If price and NOI remain fixed, cap rate stays fixed. A larger payment reduces cash flow; another financing structure can also change the cash contribution. Therefore, the cash-on-cash result can move in either direction depending on both changes. The ratio is not a financing recommendation, and a high value achieved with a small contribution does not show that cash risk has disappeared.
Use both measures with the stated limitations
Cap rate does not describe an equity contribution, and cash-on-cash does not capture unrealized appreciation or the full exit. Neither is a multi-year IRR. Use the two measures to locate the reason for a difference, then test income and cost assumptions. When comparing properties, maintain consistent vacancy, expense, cash contribution and payment definitions.
Worked example
A property with $30,000 NOI and $500,000 price has a 6% cap rate. With $18,000 debt service and $120,000 cash invested, annual cash flow is $12,000 and cash-on-cash is 10%. Raising debt service to $24,000 lowers cash-on-cash to 5% with the same contribution, while cap rate remains 6%.
Common mistakes and limitations
Do not use after-debt income as the cap-rate numerator. Do not assume the larger percentage describes the better property; it may describe a different financing or cash basis.
Cap rate depends on the quality and stabilization of the NOI assumption and does not by itself measure leveraged investor return.
Frequently asked questions
Which ratio includes financing?
Cash-on-cash uses the annual cash-flow result after the entered debt service and the investor cash contribution.
Can I compare the two percentages directly?
You can explain their difference, but they measure different relationships and should not be treated as substitutes.
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.
- Appraisal Institute — Basic Formulas — Income CapitalizationIncome/cap-rate/value relationships, gross income multiplier and debt-coverage formula references.
Read our editorial policy for the scope of these educational methods.