How leverage changes the picture
Cash-on-cash return divides your annual pre-tax cash flow by the total cash you put in — down payment, closing costs, and any upfront repairs. Because it counts your mortgage payment as an expense but only counts your own invested cash in the denominator, financing dramatically reshapes the result. A property with a modest 5% cap rate can produce a much higher cash-on-cash return when a favorable mortgage lets a small down payment control a large asset.
Leverage cuts both ways. The same borrowing that amplifies returns in a strong deal amplifies losses when rent falls short or expenses spike. If your mortgage rate is higher than the property's cap rate, leverage actually drags your cash-on-cash return below the unleveraged return — a condition called negative leverage that has become common in high-rate markets.
What cash-on-cash leaves out
Cash-on-cash return is a single-year, pre-tax snapshot. It ignores appreciation, the equity you build as tenants pay down your loan, and the tax benefits of depreciation — all of which can be major components of your total return. A property with a mediocre cash-on-cash return in year one may still be an excellent investment once appreciation and principal paydown are counted.
For that reason, use cash-on-cash return to judge the immediate income efficiency of your capital, but pair it with a longer-horizon measure like internal rate of return (IRR) for hold decisions. Cash flow keeps you solvent year to year; total return builds wealth over the full holding period.