Rental Property ROI: How to Calculate It and What Moves It

Cash-on-Cash Return: What the Property Pays Me in Cash

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

On the duplex:

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

The building produces $26,220 a year and the loan takes $27,144 of it. The owner writes a $924 check each year to hold the property.

What it leaves out: principal paydown, appreciation, and taxes. Part of that $27,144 payment is principal, which is equity the owner keeps, and cash-on-cash counts the whole payment as gone. It also depends on getting the denominator right. Leave the $12,000 of closing costs out and the same deal reads −1.1% on $85,000, and on a positive cash flow deal that omission inflates the return instead. The cash-on-cash guide covers the denominator in detail.

Total ROI: Cash Plus the Equity the Deal Builds

ROI = (Cash Flow + Principal Paydown + Appreciation) ÷ Total Cash Invested

On the duplex, year one:

Cash flow            −$924
Principal paydown   $3,454   (year one of $340,000 at 7%, 30 years)
Appreciation       $12,750   ($425,000 × 3%)
Total gain         $15,280

ROI = $15,280 ÷ $97,000 = 15.8%

The same property that costs its owner $924 a year in cash shows a 15.8% first-year return once equity enters the calculation. Both numbers are correct. They answer different questions.

What it leaves out: the tax effect of depreciation, which depends on the owner's bracket and basis and gets recaptured at sale. The calculator leaves it out for that reason. It also flattens the difference between the components. Cash flow is spendable this month. Principal paydown is real but locked in the building until a sale or refinance. Appreciation is an assumption with no contract behind it.

That last point is the biggest problem with the number. Set appreciation to zero and the duplex returns:

ROI without appreciation = (−$924 + $3,454) ÷ $97,000 = 2.6%

Of the 15.8%, 13.1 points come from the 3% appreciation input. The forecast is doing most of the work. At 5% appreciation the same deal shows 24.5%. At a 3% decline it shows −10.5%. The income and the loan are identical in all three cases. When I read an ROI figure, the first thing I check is how much of it is appreciation, and the 2.6% is the part that doesn't depend on anyone's view of the market.

Cap Rate: The Building Before the Loan

Cap Rate = NOI ÷ Purchase Price
$26,220 ÷ $425,000 = 6.2%

Cap rate describes the property with financing stripped out, which is why two buyers with different loans get the same cap rate on the same building. That makes it the cleanest way to compare one building to another.

What it leaves out: the loan, the owner's cash, and everything that happens after year one. A 6.2% cap rate on the duplex coexists with −1.0% cash-on-cash because the loan costs 7%. The cap rate guide covers how it's read against market ranges, and cap rate vs cash-on-cash covers the gap between the two.

The Same Duplex, Three Returns

A listing will usually quote whichever of these looks best. On this deal that's 15.8%, and 83% of it is a forecast.

What Moves ROI

Every lever below changes one input and leaves the rest of the duplex alone, so the effect of each is visible on its own.

Price

Buy the same duplex at $400,000 instead of $425,000, with the same NOI and terms. The loan drops to $320,000, debt service to $25,548, and cash invested to $92,000.

Cap rate      $26,220 ÷ $400,000 = 6.6%
Cash flow     $26,220 − $25,548 = $672
Cash-on-cash  $672 ÷ $92,000 = 0.7%
ROI           ($672 + $3,251 + $12,000) ÷ $92,000 = 17.3%

Price is the only lever that moves every measure at once, because it sits in the denominator of cap rate and inside both the loan and the cash invested. A $25,000 discount turns a negative cash flow deal into a positive one.

Rent

Raise total rent by $100 a month, from $3,800 to $3,900. After 5% vacancy, that adds $1,140 to NOI.

NOI           $26,220 + $1,140 = $27,360
Cash flow     $27,360 − $27,144 = $216
Cash-on-cash  $216 ÷ $97,000 = 0.2%
ROI           ($216 + $3,454 + $12,750) ÷ $97,000 = 16.9%

Rent flows straight through to cash flow because debt service doesn't change. It also changes value: an appraiser capitalizing NOI at the same 6.2% would see a more valuable building, which is the mechanism behind value-add investing and the BRRRR method.

Operating Expenses

Cut expenses by $1,200 a year, from $17,100 to $15,900. NOI rises to $27,420, cash flow to $276, cash-on-cash to 0.3%, and ROI to 17.0%.

A dollar of expense saved is worth slightly more than a dollar of rent gained, because rent loses 5% to vacancy and an expense cut does not. The trap on this lever runs the other way. Underestimating expenses at purchase inflates NOI, and every measure above inherits the error. The NOI guide covers what belongs in the expense line.

Financing

This is where the three measures start pulling in different directions.

The rate rows show negative leverage. The duplex's cap rate is 6.2%. When the loan costs more than that, each borrowed dollar costs more than the building earns on it, and cash-on-cash falls as the rate climbs.

The down payment rows show the opposite pull. Putting 50% down raises cash-on-cash from −1.0% to 4.1%, because less of the NOI goes to the lender. It lowers ROI from 15.8% to 10.8%, because the $12,750 of appreciation is now divided over $224,500 of cash instead of $97,000. Leverage magnifies the appreciation assumption. That is the whole case for borrowing at 7% against a 6.2% building: the buyer trades negative cash flow for a larger share of forecast appreciation.

Taxes and Depreciation

The ROI formula above is pre-tax. Depreciation changes what the owner keeps without changing the cash the property produces.

Residential rental buildings depreciate over 27.5 years, and land doesn't depreciate at all. If the assessor puts 20% of the duplex's value in the land, the building basis is $340,000.

Annual depreciation = $340,000 ÷ 27.5 = $12,364
Year-one interest   = $27,144 − $3,454 = $23,690
Taxable result      = $26,220 − $23,690 − $12,364 = −$9,834

The property loses $924 in cash and shows a $9,834 loss on paper. Whether that paper loss offsets any other income depends on the passive activity rules, the owner's income, and their participation in the rental. The deduction also comes back as depreciation recapture when the property sells. The mechanism is the same for everyone. The dollar value is specific to each return, and that is CPA territory. The depreciation guide walks through basis, the land split, and recapture. This section is educational, not tax advice.

Holding Period

A first-year ROI describes one year. Three of its components change every year after that.

Principal paydown accelerates. Year one on the $340,000 loan retires $3,454. Year ten retires about $6,470, because the interest share of a fixed payment shrinks as the balance falls. Appreciation compounds, if it arrives at all.

Hold the duplex five years with NOI flat and 3% annual appreciation:

Cash flow           −$924 × 5 = −$4,620
Principal paydown             $19,953
Appreciation   $425,000 × (1.03⁵ − 1) = $67,691
Total gain                    $83,024

Five-year ROI = $83,024 ÷ $97,000 = 85.6%

That 85.6% is a cumulative figure, not an annual one. Divided by five, it looks like 17.1% a year. Compounded, it is 13.2% a year. Selling costs, which this leaves out, come straight out of the appreciation line, and appreciation is 82% of the gain. An ROI quoted without a holding period can't be compared to anything, which is the gap IRR exists to close.

The Trap

The number most people call rental ROI is dominated by the one input nobody controls. On the duplex, appreciation is 13.1 of the 15.8 first-year points and 82% of the five-year gain. Price, rent, expenses, and financing are all visible and negotiable at closing. Appreciation is a guess, and leverage multiplies it. A high ROI on a negative cash flow deal is a bet on the market, and the owner funds the shortfall every year while waiting to find out.

FAQ

How do I calculate ROI on a rental property?

ROI = (Cash Flow + Principal Paydown + Appreciation) ÷ Total Cash Invested. On the $425,000 duplex with $97,000 invested, that is (−$924 + $3,454 + $12,750) ÷ $97,000 = 15.8% in year one.

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

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

Should appreciation be included in ROI?

Including it is standard, and it is also where most of the error enters. Running the number with appreciation at zero shows what income and paydown return on their own. On the duplex, that's 2.6%.

What is a good ROI on a rental property?

The question needs a definition and a holding period first. A 15.8% first-year ROI built mostly from appreciation and a 15.8% ROI built mostly from cash flow are different investments with the same label.

Why is cap rate different from ROI?

Cap rate ignores the loan and the owner's cash. ROI depends on both. The duplex's 6.2% cap rate stays the same whether the buyer puts down 20% or pays all cash, while its first-year ROI moves from 15.8% to 8.9%.

Related Reading

• Cash-on-Cash Return: Formula, Examples and How Leverage Changes It: the cash-only measure in depth
• Cap Rate Explained: the building's return before financing
• IRR in Real Estate: the measure that puts a holding period on ROI
• Rental Property Depreciation: the tax mechanism left out of the pre-tax figures
• DSCR Formula: whether the duplex's income covers its own loan