Cap rate vs. cash-on-cash return: which number should you use?

The short answer

Cap rate and cash-on-cash return are related, but they are not interchangeable.

Cap rate looks at the property before financing. It divides net operating income (NOI) by acquisition basis and tells you the unleveraged yield on the property.

Cash-on-cash return looks at the equity you invest. It divides annual pre-tax cash flow by the total cash you put into the deal, including the down payment, closing costs, and any immediate rehab.

A property has one cap rate under a given set of operating assumptions. It can have many different cash-on-cash returns depending on how it is financed.

Side-by-side comparison

	Cap rate	Cash-on-cash return
Numerator	Net operating income	Annual pre-tax cash flow
Denominator	Purchase price or all-in basis	Cash invested by the investor
Includes debt service?	No	Yes
Includes closing costs?	Only if all-in basis is used	Yes, typically
Main question	What is the property’s operating yield?	What return does my cash produce?
Best use	Comparing properties and market pricing	Evaluating a specific financing plan
Main limitation	Ignores financing and future growth	Depends heavily on leverage and loan terms

Both metrics are annual snapshots. Neither is a full discounted cash flow or IRR analysis.

What cap rate tells you

Cap rate is a property-level measure. It answers: how much NOI does the property generate relative to its acquisition basis?

If a property produces $24,000 of NOI and costs $320,000, the cap rate is 7.5%. The calculation does not care whether you pay cash or use a 20% down payment. It is a way to compare operating yield across properties and markets.

Cap rate is useful because it removes financing from the comparison. Two buyers can look at the same property and agree on the NOI and the purchase price even if they plan to use different loans.

It is not a measure of total return. A 7.5% cap rate does not mean you will earn 7.5% per year. It is one year of NOI divided by the price. It ignores rent growth, expense inflation, appreciation, tax benefits, and the sale.

What cash-on-cash return tells you

Cash-on-cash return is an equity-level measure. It answers: how much pre-tax cash flow does the deal produce relative to the cash I invest?

The numerator is usually:

NOI − annual debt service − reserves held outside NOI

The denominator is usually:

Down payment + closing costs + immediate rehab + other cash invested

If you put $73,600 into a deal and it produces $5,085 of pre-tax cash flow in the first year, the cash-on-cash return is about 6.9%.

That number is specific to your financing. Change the down payment, the interest rate, or the loan term, and the cash-on-cash return changes even though the property’s NOI has not changed.

A worked comparison

Consider a $320,000 rental property with $24,000 of NOI.

Cap rate:

$24,000 ÷ $320,000 = 7.5%

Now add financing:

• Purchase price: $320,000
• Down payment at 20%: $64,000
• Closing costs at 3%: $9,600
• Total cash invested: $73,600
• Loan amount: $256,000
• Interest rate: 6.25%
• Term: 30-year fixed
• Monthly principal and interest: about $1,576
• Annual debt service: about $18,915

Pre-tax cash flow:

$24,000 − $18,915 = $5,085

Cash-on-cash return:

$5,085 ÷ $73,600 = 6.9%

In this example, the cap rate is 7.5% and cash-on-cash return is 6.9%. The difference is the effect of financing, closing costs, and the amortizing loan.

The loan is not necessarily “bad” because cash-on-cash is lower than cap rate. The investor may value the leverage, the principal paydown, the appreciation potential, and the ability to preserve cash for other uses. But the comparison shows that the financing plan is not automatically accretive just because the property has a 7.5% cap rate.

Why the two numbers diverge

Leverage

Leverage is the use of debt to control an asset with less equity. It can amplify returns when the property’s unleveraged yield is higher than the effective cost of debt. It can reduce returns when the cost of debt is higher than the property’s yield.

A simple comparison is the cap rate versus the loan constant. The loan constant is annual debt service divided by the original loan amount. In the example, $18,915 ÷ $256,000 is about 7.39%. The property’s 7.5% cap rate is slightly above that. But closing costs and the cash invested also affect the cash-on-cash result.

This is a screening comparison, not a complete decision rule. The loan amortizes, the NOI changes, and the investor’s tax situation matters.

Cash invested

Two investors can buy the same property at the same price and report different cash-on-cash returns because they define cash invested differently. One may include closing costs and immediate repairs. Another may include a working capital reserve. A third may exclude closing costs because they are already reflected elsewhere.

The convention should be disclosed. For a conservative comparison, include all cash required to close and stabilize the property.

Expense treatment

If one model includes a capital reserve inside NOI and another holds the reserve outside NOI, cash-on-cash can differ even when the underlying property is the same. Be consistent. The cap rate numerator and the cash flow numerator should use the same NOI convention.

Vacancy and management

A self-managed owner may report a lower management expense than an investor who uses a property manager. That changes both NOI and cash flow. It is not a free improvement in the deal. It is a change in the labor and risk the owner is accepting.

When to use each metric

Use cap rate when you are:

• Comparing properties in the same market
• Screening listings before you underwrite financing
• Testing a purchase price against a required operating yield
• Talking to brokers, appraisers, or other investors about market pricing
• Evaluating a property before you know how you will finance it

Use cash-on-cash return when you are:

• Comparing financing scenarios for the same property
• Sizing a down payment or choosing between loan options
• Evaluating whether leverage improves or reduces your current cash return
• Building a personal budget for the first year
• Comparing a rental to another use of your investable cash

Use both when you are:

• Underwriting a real acquisition
• Comparing a high-leverage deal with a lower-leverage deal
• Evaluating a value-add project with renovation and refinance components
• Deciding whether a low cap rate is justified by growth or financing

What neither metric includes

Cap rate and cash-on-cash return are first-year snapshots. They do not include:

• Rent growth and expense growth over time
• Appreciation or depreciation of the property
• Principal paydown as a return (though it appears in cash flow as debt service)
• Income tax effects
• Capital expenditures beyond the reserve convention
• The timing and cost of a sale or refinance
• The risk of vacancy, tenant turnover, or regulatory change

An IRR or equity multiple can capture more of the time dimension, but those models are only as good as their assumptions. A simple cap rate with conservative inputs can be more useful than a detailed spreadsheet built on optimistic rent growth.

A better way to compare deals

Start with the property. Calculate cap rate on a consistent basis. Rebuild NOI from realistic rent and expenses. Stress-test vacancy and taxes.

Then add the financing. Calculate cash-on-cash under your actual loan terms. Include closing costs and reserves. Test a higher interest rate and a lower appraised value.

Finally, compare the results with your required return and your risk tolerance. A 7.5% cap rate with a 6.9% cash-on-cash return may be a reasonable core rental. A 5% cap rate with negative cash flow may still be a deliberate appreciation bet, but it is a different kind of investment. The labels should match the risk.

FAQ: choosing between the two

If someone asks “which number is better?” without telling you the decision, the honest answer is that the question is incomplete. Cap rate is a property metric. Cash-on-cash is an equity metric. They are tools for different parts of the same analysis.

Use cap rate to understand the property. Use cash-on-cash to understand your capital. Then use a full cash flow model to understand the next several years.

Bottom line

Cap rate measures the property’s unleveraged operating yield. Cash-on-cash measures the pre-tax cash return on the equity you invest. Financing changes the second number, not the first.

Neither metric is a verdict. A good deal needs realistic NOI, a sensible purchase price, a financing plan you can carry, and a margin of safety for the things that go wrong. Use both numbers, label your assumptions, and keep the analysis honest.