Education
Investment Property ROI Explained: Cap Rate, Cash-on-Cash & Yield
6 min read · Last updated June 2026
Rental yield, cap rate, and cash-on-cash return all measure profitability, but they answer different questions. Knowing which is which keeps you from comparing two properties on the wrong basis.
1. Rental Yield: Gross vs Net
Gross rental yield is the simplest measure: annual rent divided by purchase price. It ignores expenses entirely, so it is useful for a quick first comparison between properties but tells you nothing about actual profitability.
Net rental yield subtracts annual operating costs, such as property tax, insurance, and maintenance, before dividing by purchase price. Net yield is the more honest number, since two properties with identical gross yield can have very different expenses.
2. Cap Rate Explained
Cap rate, short for capitalization rate, is net operating income divided by the property's current market value or purchase price. Unlike rental yield, cap rate excludes mortgage payments entirely, so it measures the return as if you bought the property in cash.
$350,000 property, $28,000 annual rent
Operating expenses (tax, insurance, maintenance)$8,400
Net operating income$19,600
Cap rate5.6%
Cap rate is most useful for comparing similar properties in the same market, since it strips out financing decisions that vary from buyer to buyer.
3. Cash-on-Cash Return
Cash-on-cash return measures the actual cash income you earn relative to the actual cash you put in, meaning your down payment and closing costs, not the full purchase price. This is the number that matters most if you are financing the property with a mortgage.
Why it differs from cap rate
Leverage can make cash-on-cash return higher than cap rate. If your mortgage rate is lower than your cap rate, borrowing money to buy the property amplifies your return on the cash you actually invested.
4. Why Vacancy Rate Matters
No rental property stays occupied 100% of the time. A vacancy rate of 5%, for example, assumes the unit sits empty for roughly two to three weeks a year on average. Skipping this in your calculations overstates your real income and can make a marginal property look profitable when it is not.
Vacancy rate varies heavily by location and property type, so use local market data rather than a generic assumption when you can.
5. Appreciation vs Cash Flow
Cash flow is the money the property generates each month after all expenses and the mortgage payment. Appreciation is the increase in the property's market value over time. Both contribute to total return, but they behave very differently.
Cash flow is realized income you can spend or reinvest today. Appreciation is unrealized until you sell, and it depends on market conditions outside your control. A property with thin cash flow but a strong appreciation market can still be a good long-term investment, but it carries more uncertainty.
6. Putting It Together: Total ROI
Total return on investment for a rental property combines three things over your holding period: cumulative cash flow, equity gained from paying down the mortgage principal, and appreciation in the property's value, minus selling costs when you eventually sell.
The full picture
A property that looks mediocre on cap rate alone can still post a strong total ROI once you factor in mortgage paydown and appreciation over a 5 to 10 year hold. This is why looking at any single metric in isolation can be misleading.