Cash-on-Cash Return, Explained With a Real Example

The one return number that tells you what a rental property actually does for your money, how to calculate it in a minute, and why it’s not the only number that matters.

If you spend any time around real estate investing, you’ll hear “cash-on-cash return” thrown around constantly. It sounds technical, but it’s one of the simplest and most useful numbers you can learn, and once you understand it you can size up a rental deal in about a minute. I’ll define it plainly, walk through a real example with my own numbers, and let you know about where it can mislead you.

If you’re brand new to all this, start with What Is House Hacking? This post is about one specific way to measure whether a deal is any good.

What “cash-on-cash return” measures

Cash-on-cash return is the annual cash you get back from a property divided by the actual cash you put in to buy it, expressed as a percentage. As Investopedia defines it, it measures the annual pre-tax cash flow relative to the total cash invested, and it’s used to evaluate the return on a real estate investment.

The formula is short:

Cash-on-cash return = annual pre-tax cash flow ÷ total cash invested

“Annual pre-tax cash flow” is the money left over after you collect rent and pay every expense, including the mortgage, for a year. “Total cash invested” is what you actually spent to get in: down payment, closing costs, and any upfront repairs. Notice what’s not in there. It ignores the loan balance, appreciation, and tax benefits. It’s a clean measure of one thing: how hard your invested cash is working right now.

Why investors like it

Two reasons. First, it puts every deal on the same footing. A $200,000 house and a $600,000 duplex can be compared directly by the percentage return on the cash you sink into each. Second, it focuses on real money in your pocket, not paper gains you can’t spend. A property can be appreciating nicely and still bleed you dry every month, and cash-on-cash return catches that.

A real example

Let me use round numbers close to a straightforward rental to keep it clear.

Say you buy a $300,000 duplex. With an FHA owner-occupied loan at 3.5 percent down, your down payment is about $10,500. Add roughly $9,500 in closing costs and a little upfront work, and your total cash invested is about $20,000.

Now the yearly cash flow. Suppose the rented unit brings in $1,400 a month, or $16,800 a year. Your total costs for the year, including mortgage, taxes, insurance, maintenance, and a vacancy allowance, come to $14,800. That leaves $2,000 of pre-tax cash flow for the year.

Cash-on-cash return is $2,000 divided by $20,000, which is 10 percent. That means the cash you put in is returning 10 percent a year in pure cash flow, before you even count the loan paydown, appreciation, or tax perks. By most investors’ standards, that’s a solid deal.

Change one input and watch it move. If you’d put 20 percent down as an investor instead of 3.5 percent as an owner-occupant, your cash invested jumps to around $70,000, and the same $2,000 of cash flow is suddenly a 3 percent return. Same building, very different number. This is a big part of why living in the property and using a low-down-payment loan is so powerful; it keeps the denominator small.

Where cash-on-cash return can fool you

It’s a useful number, but treating it as the whole story leads people astray.

It ignores loan paydown. Every month your tenant is chipping away at your mortgage balance, quietly building your equity. Cash-on-cash return doesn’t count a dollar of that.

It ignores appreciation. If the property is gaining value, that’s real wealth, and this number is blind to it.

It ignores taxes. Rental real estate comes with deductions, especially depreciation, that can shelter income. I covered that here: Depreciation on Rental Property, Explained. Cash-on-cash return is a pre-tax figure, so it misses this too.

And it’s only as good as your inputs. If you lowball your maintenance and vacancy assumptions, you’ll get a beautiful number that falls apart in real life. Be conservative with expenses.

How this fits house hacking

When you house hack, cash-on-cash return isn’t quite the right lens, because you’re not just an investor collecting rent; you’re also a resident who would otherwise be paying to live somewhere. The number that matters more for you is your effective housing cost, meaning your payment minus the rent you collect. I wrote about that here: The One Number Every House Hacker Should Track.

Still, cash-on-cash return is worth understanding, because once you move out of your house hack and rent both units, or when you buy a pure rental later, this becomes the number you live by.

Just run it

You don’t need to do this math by hand. Put a real listing into the free house hacking calculator, and it shows your cash flow and returns based on the price, rent, and loan terms you enter. Do that on a few properties and you’ll quickly develop a feel for what a good number looks like in your market.

The point

Cash-on-cash return is annual cash flow divided by the cash you invested, and it tells you how hard your money is working right now. It’s great for comparing deals quickly and for spotting properties that look good on paper but drain you monthly. Just don’t mistake it for the full picture; it ignores loan paydown, appreciation, and taxes, all of which are doing real work in the background. Use it as one honest gauge among several, and always run conservative numbers.

Sources

• Cash-on-Cash Return: Definition, Formula, and Example — Investopedia
• FHA Loans — U.S. Department of Housing and Urban Development

I’m not a guru and there’s nothing to buy here. The tools are free. If you want more posts like this as I write them, subscribe on the blog, or if you’ve found a place and want a second pair of eyes on the numbers, send me the deal.

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