How to explain cap rate and cash-on-cash return to investor clients

Explain cap rate as a rental property’s yearly net operating income divided by its price: it shows what the property earns before any mortgage, so it compares properties fairly. Explain cash-on-cash return as the yearly cash flow after mortgage payments divided by the cash the buyer actually invested: it shows what their money earns once financing is counted. The two can differ widely, so show both, build the income figure from vacancy and expenses, and label every number an assumption, not a forecast.

Investor clients ask about returns in short-hand: “What’s the cap rate?”, “What’s the cash-on-cash?” Both are simple ratios, but they answer different questions, and mixing them up is where conversations go wrong. An agent’s job is to explain what each one measures and show the arithmetic from the client’s own assumptions, not to promise an outcome.

Cap rate: what the property earns

Cap rate = net operating income (NOI) ÷ purchase price.

NOI is built in three steps:

1. Scheduled income: a year of rent plus any other income, such as parking or laundry.
2. Less vacancy: an allowance for months with no tenant.
3. Less operating expenses: property tax, insurance, repairs and maintenance, management, HOA and any utilities the owner pays.

Mortgage payments, income tax and depreciation are not operating expenses, so they are not in NOI. That is why cap rate lets you compare two properties without knowing how either buyer pays for them.

Cash-on-cash: what the investor’s cash earns

Cash-on-cash = yearly cash flow after the mortgage ÷ cash invested.

Cash flow is NOI less the year’s mortgage payments. Cash invested is the down payment plus closing costs and any up-front repairs. This one depends on the loan, so it changes with the down payment and interest rate.

A worked example (illustrative numbers)

All figures are made up for teaching. Real rents, costs and rates differ by market.

• Purchase price 300,000. Rent 2,400 a month, so scheduled income is 28,800 a year.
• Vacancy at 5%: 1,440. Income after vacancy: 27,360.
• Expenses: property tax 3,600, insurance 1,200, repairs at 5% of rent (1,440), management at 8% of rent (2,304). Total 8,544.
• NOI = 27,360 − 8,544 = 18,816.
• Cap rate = 18,816 ÷ 300,000 ≈ 6.3%.

Now add financing: 20% down (60,000), 240,000 borrowed over 30 years at 6.75%. The payment is about 1,557 a month, or 18,680 a year.

• Cash flow = 18,816 − 18,680 ≈ 136 a year.
• Cash invested: 60,000 down plus 9,000 closing costs and repairs = 69,000.
• Cash-on-cash ≈ 136 ÷ 69,000 ≈ 0.2%.

A cap rate of about 6.3% and a cash-on-cash of about 0.2% describe the same property. The loan costs nearly as much as the property earns. That is the single most useful thing to show an investor: borrowing at a rate close to the cap rate leaves little cash flow. Change the down payment or the rate and watch the second number move while the first stays put.

Two quick screens, with a caution

• Gross yield: a year of scheduled rent divided by the price. Here 28,800 ÷ 300,000 = 9.6%. It looks generous because it ignores vacancy and every cost, so show it next to the cap rate.
• The 1% rule: monthly rent of at least 1% of the price. Here 2,400 against a 3,000 target would not pass. It is a rough filter only: it says nothing about tax, repairs or vacancy, and many sound properties in expensive areas fail it.

How to run the conversation

1. Ask for the client’s assumptions first: expected rent, vacancy, repair and management allowance, down payment, and rate.
2. Build NOI line by line so the client can see where each number comes from.
3. Show cap rate, then cash flow and cash-on-cash. Say that the first describes the property and the second describes the financing.
4. Test a cautious case: more vacancy, higher repairs, a higher rate.
5. Compare with similar properties nearby, not a fixed “good” number.

The rental property cap rate calculator does this arithmetic and prints a one-page sheet with the assumptions listed; nothing you type is sent or stored. To check a payment at a different rate or term, use the mortgage payment calculator, and for the up-front cash, the closing cost estimator (see also how to explain closing costs).

Keep it honest

Every figure is an assumption. Real results depend on rents, vacancy, repairs, taxes, financing and the market, and the calculator leaves out income tax, depreciation and appreciation. Do not promise a return. Say the numbers are estimates, not investment, tax, financial or legal advice, and suggest the client checks them with a lender and an accountant or financial adviser. Explain the measures the same way to every client.

Common questions