Cash-on-Cash Return, Explained

Cap rate tells you what a property earns. Cash-on-cash return tells you what you earn on the money you actually put in. Once a mortgage enters the picture, that's usually the number an investor cares about most — because it's measured against your down payment, not the full purchase price.

The formula

Two pieces, both of which reward being precise:

• Annual pre-tax cash flow = net operating income − annual debt service (your mortgage principal and interest). This is the cash left in your pocket after the bank is paid.
• Total cash invested = down payment + closing costs + any upfront repairs. It's the real money that left your account to get the deal done — not the purchase price.

A worked example

Return to a property with an NOI of $17,000. You buy it for $300,000 with 25% down on a 7% loan:

This is the lesson cap rate can't teach you: the same property with a healthy ~5.7% cap rate produces negative cash-on-cash once you finance it at 7%. The deal earns money; your financing eats it. Put more down, negotiate the price, or find a cheaper loan and the number swings positive — cash-on-cash is where those levers show up.

How it differs from cap rate

• Cap rate is unlevered. It divides NOI by the full price and ignores your loan, so it compares properties. See how to calculate cap rate.
• Cash-on-cash is levered. It divides post-mortgage cash flow by your invested cash, so it compares deals — the same property gives every buyer a different cash-on-cash depending on how they financed it.

Leverage cuts both ways. A larger loan means less cash invested, which can lift cash-on-cash when the property out-earns its interest rate — and sink it when it doesn't, exactly as the example above shows.

What the number leaves out

Cash-on-cash is a first-year, cash-only snapshot. On purpose, it ignores several things that make up your true return:

• Principal paydown — each mortgage payment builds equity, but that's not cash in hand this year.
• Appreciation — a rising property value never shows up in a cash-on-cash figure.
• Tax effects — depreciation and deductions can meaningfully change your after-tax result.
• Future years — as rents rise and the loan balance falls, cash-on-cash typically climbs over time.

Treat it as the honest answer to one specific question — “what is this deal paying me in cash, right now, on the money I risked?” — and pair it with cap rate and a full cash-flow projection for the complete picture.