You're analyzing a rental property and two numbers keep coming up: cap rate and cash-on-cash return. They both measure profitability. They both use NOI or cash flow. So what's the difference, and which one should you actually care about?
The short answer: cap rate tells you how the property performs. Cash-on-cash tells you how your money performs. One ignores your mortgage entirely. The other depends on it completely.
The Formulas: Side by Side
The critical difference is right there in the formulas. Cap rate uses NOI — income before any mortgage payments. Cash-on-cash uses cash flow after debt service and divides by your actual out-of-pocket investment, not the full property price.
Same Property, Very Different Numbers
Let's look at how these two metrics tell different stories for the same deal:
Purchase Price: $400,000
Down Payment (25%): $100,000
Closing Costs: $8,000
Total Cash Invested: $108,000
Annual Gross Rent: $48,000 ($4,000/month)
Annual Operating Expenses: $16,800
NOI: $31,200
Annual Mortgage Payment: $23,880 ($300K at 7%, 30yr)
Annual Cash Flow: $31,200 − $23,880 = $7,320
| Metric | Calculation | Result |
|---|---|---|
| Cap Rate | $31,200 ÷ $400,000 | 7.8% |
| Cash-on-Cash Return | $7,320 ÷ $108,000 | 6.8% |
In this case, cash-on-cash is lower than cap rate because the mortgage interest rate (7%) is close to the cap rate (7.8%). The property still cash flows, but financing is eating into returns. Now watch what happens with a lower rate:
Annual Mortgage Payment: $20,424 ($300K at 5.5%, 30yr)
Annual Cash Flow: $31,200 − $20,424 = $10,776
Cash-on-Cash Return: $10,776 ÷ $108,000 = 10.0%
Same property, same cap rate (7.8%), but cash-on-cash jumped from 6.8% to 10.0% just by getting a better interest rate. This is why cash-on-cash matters for individual investors — your financing terms dramatically change your actual return.
When your mortgage rate is below the cap rate, leverage works in your favor (positive leverage) and cash-on-cash exceeds cap rate. When your mortgage rate is above the cap rate, leverage works against you (negative leverage).
When to Use Cap Rate
Comparing properties to each other. Since cap rate strips out financing, it lets you compare a property you'd buy with cash against one you'd finance heavily. The underlying asset performance is what you're measuring.
Quick screening. You can calculate cap rate from a listing in seconds — just estimate NOI and divide by the asking price. It's the fastest way to filter deals before doing deeper analysis.
Assessing market pricing. Cap rates tell you whether a market or property type is expensive or cheap relative to income. A 4% cap rate market is pricey. A 9% cap rate market offers more yield per dollar of property value.
Talking to other investors. Cap rate is the universal language of commercial and investment real estate. When someone says "that property is trading at a 6 cap," everyone understands what that means regardless of their individual financing.
When to Use Cash-on-Cash Return
Evaluating YOUR actual return. If you're putting $100K into a deal, you want to know what that $100K earns you after all expenses including the mortgage. Cash-on-cash answers that directly.
Comparing real estate to other investments. If your cash-on-cash return is 4%, you might be better off in an index fund. If it's 12%, you're earning significantly more than most passive investments. This is the metric that answers "is this worth my capital?"
Evaluating financing options. Should you put 20% down or 25%? Go with a 15-year or 30-year mortgage? Cash-on-cash shows you exactly how each financing scenario changes your return on invested capital.
BRRRR strategy analysis. In BRRRR deals, your cash invested after refinancing might be very small — sometimes near zero. Cash-on-cash is the metric that captures the "infinite return" potential of BRRRR when you pull all your cash back out. Check out our BRRRR guide for more.
The Complete Picture: Use Both Together
Smart investors don't choose one metric over the other. They use cap rate to evaluate the property and cash-on-cash to evaluate the deal given their specific financing:
| Scenario | Cap Rate | Cash-on-Cash | What It Tells You |
|---|---|---|---|
| High cap, high CoC | 9% | 14% | Strong property + positive leverage = great deal |
| High cap, low CoC | 9% | 4% | Good property but bad financing is killing returns |
| Low cap, high CoC | 4.5% | 10% | Expensive market but cheap debt amplifies returns |
| Low cap, low CoC | 4.5% | 3% | Pricey property + expensive debt = probably pass |
Use cap rate to find good properties, then use cash-on-cash to structure good deals. A great property with terrible financing is a bad deal. A mediocre property with excellent financing is still mediocre.
What About All-Cash Buyers?
If you're buying with no mortgage, cap rate and cash-on-cash converge — but they're still not identical. Cash-on-cash would include closing costs in the "cash invested" denominator, making it slightly lower than cap rate. The difference is small, usually less than half a percentage point.
For all-cash buyers, cap rate is the more useful metric since there's no leverage to evaluate.
Calculate Both Metrics Instantly
CapRateKit calculates cap rate, cash-on-cash return, DSCR, and break-even analysis side by side. Adjust financing terms and see how they change in real time.
Try CapRateKit Free →Other Metrics to Use Alongside Cap Rate and Cash-on-Cash
DSCR (Debt Service Coverage Ratio) — tells you whether the property generates enough income to cover the mortgage. A DSCR above 1.25 means the property has a healthy margin. Read our DSCR guide.
NOI (Net Operating Income) — the foundation of cap rate. Getting NOI right is critical because garbage in means garbage out for every metric downstream. See how to calculate NOI.
Total Return / IRR — accounts for appreciation, principal paydown, and tax benefits over time. Cap rate and cash-on-cash are both point-in-time snapshots. IRR captures the full picture over your hold period.
Frequently Asked Questions
What is a good cash-on-cash return for rental property?
Most investors target 8-12% cash-on-cash return. Above 12% is excellent. Below 6% may not justify the effort compared to passive investments like index funds or REITs, though some investors accept lower cash-on-cash in high-appreciation markets where total returns (including equity growth) are strong.
Can cash-on-cash return be negative?
Yes. If your annual mortgage payments exceed your NOI, the property has negative cash flow, which means negative cash-on-cash return. This happens when you overpay, overestimate rents, underestimate expenses, or have unfavorable financing terms. It can also happen during periods of high vacancy.
Does cash-on-cash include appreciation?
No. Cash-on-cash only measures cash flow return — the actual money hitting your bank account each year divided by your investment. Appreciation, principal paydown, and tax benefits are separate (and important) components of total return.
Should I use cap rate or cash-on-cash for a BRRRR deal?
Both, but cash-on-cash is especially useful for BRRRR because your cash invested changes after the refinance. If you pull all your capital back out, your cash-on-cash becomes theoretically infinite. Cap rate tells you whether the property itself is a good rental regardless of the BRRRR mechanics. Use our BRRRR calculator to run both.