Cash-on-cash return is defined as annual pre-tax cash flow divided by the total cash invested: down payment, closing costs, and up-front repairs. Put in $20,000 and clear $2,000 a year and that is a 10% cash-on-cash return.
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. I’ll define it plainly, walk through a real example with my own numbers, and let you know where it can mislead you.
Once you understand it, you can size up a rental deal in about a minute.
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 annual pre-tax cash flow divided by total cash invested: down payment, closing costs and upfront repairs, expressed as a percentage.
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.
- What it leaves out: the loan balance, appreciation, and tax benefits. It is a clean measure of one thing: how hard your invested cash is working right now.
Why investors use cash-on-cash return
Investors use cash-on-cash return because it compares any two deals by the cash actually invested and measures spendable cash flow, not paper gains.
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.
Cash-on-cash return example on a duplex
On a $300,000 duplex bought with 3.5 percent down, $2,000 of yearly cash flow on $20,000 invested is a 10 percent cash-on-cash return.
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, for the first full year after you move out and rent both units. Suppose each rents for $1,590 a month, or $38,160 a year. At 6.95 percent, Freddie Mac’s average for the week ending September 17, 2026, your total costs for mortgage, FHA mortgage insurance, taxes, insurance, maintenance and a vacancy allowance come to about $36,100. That leaves about $2,000 of pre-tax cash flow.
| Cash-on-cash return on a $300,000 duplex | Amount |
|---|---|
| Purchase price | $300,000 |
| Down payment, FHA owner-occupant at 3.5% | $10,500 |
| Closing costs and a little upfront work | about $9,500 |
| Total cash invested | $20,000 |
| Rent, both units at $1,590 a month | $38,160 a year |
| Mortgage and FHA mortgage insurance at 6.95 percent, taxes, insurance, maintenance and a vacancy allowance | about $36,100 a year |
| Annual pre-tax cash flow | $2,000 |
| Cash-on-cash return, $2,000 ÷ $20,000 | 10% |
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.
The lever: change one input and watch it move. If you’d put 25 percent down as an investor, the minimum on a two-to-four-unit rental you don’t live in, instead of 3.5 percent as an owner-occupant, your cash invested jumps to around $85,000, and the same $2,000 of cash flow is suddenly a 2.4 percent return. 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.
| Same $300,000 duplex | Owner-occupant, FHA | Investor, conventional |
|---|---|---|
| Down payment | $10,500 (3.5%) | $75,000 (25%) |
| Closing costs | about $9,500 | about $10,000 |
| Total cash invested | $20,000 | about $85,000 |
| Annual pre-tax cash flow, held constant | $2,000 | $2,000 |
| Cash-on-cash return | 10% | about 2.4% |
Cash flow is held at $2,000 in both columns to isolate the denominator. The 25% loan is smaller and carries no FHA mortgage insurance, so its real cash flow would be somewhat higher and the gap somewhat narrower. At the same rate and costs the order can even flip, with the larger down payment ahead, so read this as a lesson about the denominator, not a fixed ranking. Leverage can lift or lower cash-on-cash depending on the borrowing cost and the property’s yield.
Same building, very different number.Living in it is what keeps the denominator small.
Where cash-on-cash return can fool you
Cash-on-cash return ignores loan paydown, appreciation and tax deductions, and it is only as reliable as your maintenance and vacancy assumptions.
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 and 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.
The catch: it is 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.
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.
How this fits house hacking
For a house hacker, effective housing cost, the payment minus rent collected, matters more than cash-on-cash return until you move out and rent both units.
What this means for a house hacker: 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.
Free cash-on-cash return calculator
The free house hacking calculator returns cash flow and cash-on-cash return from a listing’s price, rent and loan terms, with no hand math required.
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.
Is cash-on-cash return enough on its own
No. Cash-on-cash return is one gauge among several; pair it with cap rate, total return and, for house hackers, effective housing cost.
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 is great for comparing deals quickly and for spotting properties that look good on paper but drain you monthly.
| Metric | Formula | What it ignores | Best for |
|---|---|---|---|
| Cash-on-cash return | annual pre-tax cash flow ÷ total cash invested | loan paydown, appreciation, taxes | comparing deals by the cash you put in |
| Cap rate | net operating income ÷ purchase price | the loan entirely | comparing buildings regardless of financing |
| Total return | cash flow + principal paid + appreciation, ÷ cash invested | nothing, but two of its inputs are forecasts | judging a hold over several years |
| Effective housing cost | your full payment minus the rent you collect | returns entirely | house hackers in year one |
The short version: do not 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 straight gauge among several, and always run conservative numbers.
If you are deciding between free and paid tools for this math, my BiggerPockets calculator alternative comparison walks through the trade-offs.
Once you know how to calculate the number, the next step is judging it. Here is what a good cash on cash return looks like, with realistic benchmarks.
Run a building through the math instead of guessing at it.
The free house hacking calculator. Put in a price, a rent and your loan terms, and it returns your real monthly cost in a few seconds.
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Sources
- Cash-on-Cash Return: Definition, Formula, and Example, Investopedia
- FHA Loans, U.S. Department of Housing and Urban Development
- Publication 527, Residential Rental Property, Internal Revenue Service (depreciation and deductible rental expenses, the tax effects cash-on-cash return leaves out)
- Single Family Housing Policy Handbook 4000.1, U.S. Department of Housing and Urban Development (FHA minimum 3.5% down payment for owner-occupants)
- [S1] Fannie Mae, Eligibility Matrix (5 August 2026), checked September 2026: on an investment-property purchase underwritten through DU, the maximum loan-to-value is 85% for one unit and 75% for two to four units. singlefamily.fanniemae.com.
I’m not a guru, and the tools here 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.
Frequently asked questions
How do you calculate cash-on-cash return?
Cash-on-cash return is calculated by dividing annual pre-tax cash flow by total cash invested and multiplying by 100. Annual pre-tax cash flow is rent collected minus every operating cost and the mortgage payment for the year; total cash invested is the down payment plus closing costs and up-front repairs. $2,000 of cash flow on $20,000 invested is a 10% cash-on-cash return.
What is a good cash-on-cash return?
A good cash-on-cash return on a small rental is generally 8% or higher, with 5 to 8 percent typical for 2-4 unit properties in most Midwest metros as of 2026. House hackers often accept less in year one because living in the building cuts their own housing cost, which the metric does not count. What a good cash-on-cash return looks like goes through the benchmarks.
What is the difference between cash-on-cash return and cap rate?
Cap rate is net operating income divided by purchase price, so it ignores the loan entirely. Cash-on-cash return is cash flow after the mortgage payment divided by the cash you put in, so it changes with the loan. The same building has one cap rate and a different cash-on-cash return for every down payment.
Does cash-on-cash return include appreciation or loan paydown?
Cash-on-cash return is defined to exclude appreciation, principal paydown and tax effects. It measures pre-tax cash flow only, which is why it understates the total return on a rental that is paying down its own loan and gaining value.