Cash-on-Cash Return Calculator

Cash-on-cash return measures annual cash flow as a percentage of the cash actually invested, which makes it the working metric of property investing. The formula is annual pre-tax cash flow divided by total cash invested, times 100. On the defaults, 8,000 of annual cash flow against 80,000 of cash invested gives 10.00%, alongside a monthly cash flow of 666.67 and a payback period of 10.0 years, meaning the cash put in is returned in cash flow alone over that span. It compares deals on equal footing whatever the financing structure, because the denominator is only the money that actually left the investor’s account.

Take a 400,000 property with a 25% deposit, so 100,000 of cash, plus 5,000 of closing costs, giving 105,000 invested. Annual rent of 24,000 against a mortgage of 18,000 and operating expenses of 5,000 leaves annual cash flow of 1,000. That is a cash-on-cash return of 0.95%, and a payback period of 105 years on cash flow alone. The calculator rates anything below 4% as below market, and this sits far under it. The levers that move it are the rent level, the operating expenses, and the purchase price, in roughly that order of tractability.

The calculator applies four bands to the result: below 4% is below market, 4% to 8% is average, 8% to 12% is good, and 12% or above is rated excellent. Those thresholds are conventions rather than anything enforced, and a high figure often signals higher risk or a value-add situation rather than a straightforwardly better deal. What the measure ignores matters as much as what it captures: capital appreciation, mortgage principal paydown, and any tax treatment all sit outside it. Total return including those components is frequently well above the cash-on-cash figure. Cash-on-cash answers the cash flow question; an internal rate of return answers the total return question, and both are needed for a full view.

A worked example

With the defaults, an annual pre-tax cash flow of 8,000 against total cash invested of 80,000, the tool returns 10.00%. The breakdown shows the annual figure, the monthly equivalent of 666.67, the cash invested, a payback period of 10.0 years and a rating of Good.

What moves the number most

The result responds to Annual Pre-Tax Cash Flow and Total Cash Invested, and to nothing else. Both move it proportionally: raising the cash flow by 10% raises the return by 10%, and raising the cash invested by 10% cuts the return by about 9%. The asymmetry is small but real, because one sits in the numerator and the other in the denominator. In practice the cash flow figure is the harder of the two to pin down, since it depends on rent, financing cost and operating expenses all being estimated honestly, while cash invested is a number that can be looked up.

The formula behind this

Cash-on-cash return equals annual pre-tax cash flow divided by total cash invested, multiplied by 100. Payback in years is the reciprocal of that ratio, meaning cash invested divided by annual cash flow. Monthly cash flow is the annual figure divided by twelve. Nothing compounds and nothing is projected forward, so the figure describes one year at the stated inputs rather than a path.

Where this fits in planning

This is a what-if tool rather than a forecast. It helps to test ideas: what happens if one of the inputs comes in higher or lower than first assumed. Running several sets of figures shows how sensitive the result is to each input, where a single set does not. It is worth remembering that the number excludes the two components that often dominate a property’s long-run return, appreciation and principal paydown, and that both move with markets and financing conditions rather than with the inputs on this page.