Cash-on-Cash Return: Formula, Examples and How Leverage Changes It

The Formula

Cash-on-Cash Return = Annual Pre-Tax Cash Flow ÷ Total Cash Invested
Annual Pre-Tax Cash Flow = NOI − Annual Debt Service

Both halves have to be built correctly, and each one has a common error.

What Counts as Cash Invested

The denominator is every dollar that left the buyer's account to acquire the property and get it producing rent.

The error here is leaving out closing costs. On the duplex below, $12,000 of closing costs is 12.4% of the $97,000 in the deal. Drop it and the denominator shrinks to $85,000, which makes a positive return look larger than it is and a negative one look worse. Either way the number stops describing the actual cash.

What Counts as Cash Flow

The numerator is NOI minus a full year of principal and interest. NOI is rent after vacancy, minus operating expenses, before the loan. The NOI guide covers what belongs in the expense line.

The error here is treating NOI as cash flow. NOI is before the loan, so dividing NOI by the down payment produces a number that looks like cash-on-cash and is not. It is a hybrid of an unlevered income and a levered denominator, and it overstates the return by the full amount of debt service.

The Duplex, Worked

I run the same $425,000 duplex across this site so the numbers agree wherever a reader lands. It rents for $3,800 a month.

Gross rent:          $3,800 × 12       = $45,600
Vacancy (5%):                            $2,280
Operating expenses:                     $17,100
NOI:                                    $26,220
Cap rate:            $26,220 ÷ $425,000 = 6.2%

The purchase is 20% down with a 7%, 30-year loan:

Down payment:        $425,000 × 20%    = $85,000
Closing costs:                           $12,000
Total cash invested:                     $97,000

Loan:                                   $340,000
Monthly payment (7%, 30 years):         $2,262.03
Annual debt service:                    $27,144

Cash flow = $26,220 − $27,144 = −$924
Cash-on-cash = −$924 ÷ $97,000 = −1.0%

The building yields 6.2% on its price. The buyer's $97,000 yields −1.0%, and the owner writes a $924 check each year to hold it. Neither number is wrong. The gap between them is the loan.

How Leverage Changes It

The usual intuition is that borrowing magnifies returns. That holds only when the loan costs less per dollar than the building earns per dollar. On the duplex it doesn't.

Hold the property, the NOI, the 7% rate, and the $12,000 of closing costs constant, and change only the down payment:

Every step toward less debt raises the return. That is negative leverage, and the reason is visible in one number. The loan constant, annual debt service divided by the loan, is $27,144 ÷ $340,000 = 7.98%. Each borrowed dollar costs 7.98 cents a year. Each dollar of price earns 6.2 cents of NOI. Every dollar financed at a higher cost than it earns pulls the return on the rest down.

The all-cash row reads 6.0% rather than 6.2% because the closing costs sit in the denominator. That 6.0% is the break point for this deal: a loan with a constant below it raises cash-on-cash, and a loan with a constant above it lowers it.

Change the rate instead and the direction flips. At 4% over 30 years, the same $340,000 costs $19,479 a year, a 5.73% constant. Cash flow is $6,741 and cash-on-cash at 20% down is 6.9%, above the 6.0% all-cash figure. Positive leverage exists on this building. On a 30-year loan it needs a rate below about 4.4%, where the constant drops under 6.0%.

The 6% row is the trap most people fall into. A 6% rate sits below the 6.2% cap rate, so the deal looks like positive leverage. It isn't. The loan constant is 7.19%, because a 30-year payment carries principal as well as interest, and principal is a cash outflow even though it builds equity. Comparing the interest rate to the cap rate misses that. Comparing the loan constant to the cap rate doesn't.

What a Good Cash-on-Cash Return Depends On

I don't carry a target number, because the useful comparisons are relative ones.

Against the all-cash yield. If the financed cash-on-cash sits below what the same building returns bought outright, the debt is costing the owner income. On the duplex at 7%, that's −1.0% against 6.0%.

Against the owner's other uses for the cash. $97,000 in the duplex earns −1.0% in cash. Whatever that money could earn elsewhere at similar risk is the real hurdle, and it moves with the market.

Against what the number leaves out. A buyer accepting −1.0% is usually counting on principal paydown and appreciation. Year one of the loan retires $3,454 of principal. Add that and the return is (−$924 + $3,454) ÷ $97,000 = 2.6%, before any appreciation. The ROI guide adds the rest and shows how much of a total return is forecast.

Against how it was produced. A high cash-on-cash from buying well below market and a high cash-on-cash from a thin down payment look identical in the ratio. The second one has a smaller cushion: less equity, a larger payment, and less room for a vacancy or a rate reset.

Strategies That Push the Ratio High

Two strategies routinely produce very large cash-on-cash figures, and in both the size comes mostly from the denominator.

House hacking. An owner-occupant buying a small multifamily property with a low-down-payment loan puts little cash in, so any positive cash flow becomes a large percentage. The ratio also blends in something it wasn't built to measure: the housing cost the owner no longer pays elsewhere. The house hacking guide runs that math separately.

BRRRR. A refinance after rehab pulls cash back out. Cash invested can fall toward zero, and the ratio rises toward infinity as it does. Two things move at once, though. The new loan is larger, so debt service rises and cash flow usually falls. The percentage goes up while the dollars coming in go down, and the property carries more debt against the same NOI. The BRRRR guide walks through the refinance math.

In both cases the ratio stops describing risk. A very high cash-on-cash on a thin equity position means a small change in rent or expenses moves the result by a lot.

The Trap: Cash-on-Cash Magnifies Every Error in NOI

Leverage doesn't only change the level of the return. It changes how hard every assumption hits it. On the duplex at 20% down and 7%:

A 10% rent miss moves the cap rate about one point and moves cash-on-cash about four and a half points. The debt service doesn't shrink when the rent does, so the whole miss lands on the owner's slice. An optimistic rent or expense assumption at purchase inflates cash-on-cash more than any other metric on the page.

Other Limits

One year only. The ratio uses one year of cash flow. It can't see rent growth, a lease ending, or an adjustable rate resetting. Multi-year returns are what IRR measures.

Capital expenditures are invisible. NOI excludes capex, so cash flow does too. A roof comes out of the owner's cash in a year the ratio never reflects.

Pre-tax by convention. Depreciation can shelter some or all of the cash flow from income tax, and the amount depends on the owner's situation. That is CPA territory. The depreciation guide covers the mechanism.

FAQ

What is the cash-on-cash return formula?

Annual pre-tax cash flow ÷ total cash invested, where cash flow is NOI minus annual debt service. On the duplex: −$924 ÷ $97,000 = −1.0%.

Can cash-on-cash return be higher than the cap rate?

Yes, when the loan constant is below the building's yield. On the duplex, a 4% loan produces 6.9% cash-on-cash at 20% down against a 6.2% cap rate. At 7%, it produces −1.0%.

Can cash-on-cash return be negative?

Yes, whenever debt service exceeds NOI. The duplex at 20% down and 7% returns −1.0%, meaning the owner funds $924 a year from other income.

What is the difference between cash-on-cash return and ROI?

Cash-on-cash counts only the cash the property produces after the loan. ROI adds principal paydown and appreciation. On the duplex, cash-on-cash is −1.0% and first-year ROI with 3% appreciation is 15.8%.

Does a refinance change cash-on-cash return?

Yes. It is the one return metric a refinance moves in two directions at once. Cash pulled out shrinks the denominator, and the larger loan shrinks the numerator.

How do interest rates affect cash-on-cash return?

Through the loan constant. On the $340,000 loan, each point of rate moves annual debt service by roughly $2,400 to $2,800, and all of it comes straight out of cash flow. From 6% to 8%, cash-on-cash on the duplex falls from 1.8% to −3.8%.

Related Reading

• Cap Rate vs Cash-on-Cash: why the two metrics disagree once a loan is involved
• Cap Rate Explained: the building's return before financing
• Rental Property ROI: cash flow plus principal paydown and appreciation
• DSCR Formula: whether the duplex's income covers its own loan
• Break-Even Occupancy Analysis: how much vacancy a deal can absorb before cash flow turns negative