What Is Cap Rate and Why Does It Matter for Rental Property Investors?
What Is Cap Rate and Why Does It Matter for Rental Property Investors?
Capitalization rate — cap rate — is one of the most commonly cited metrics in real estate investing, and also one of the most frequently misapplied. Understanding what it actually measures (and what it doesn’t) makes you a sharper investor.
The Cap Rate Formula
Cap rate = Net Operating Income (NOI) divided by Purchase Price. If a property generates $12,000/year in NOI and costs $200,000, the cap rate is 6% ($12,000 / $200,000). That’s it. Simple math.
What Cap Rate Actually Measures
Cap rate measures the unlevered yield on a property — what it would return if you paid cash, with no mortgage. It’s useful for comparing properties and markets on a standardized basis, regardless of how they’re financed.
Higher cap rate = higher return relative to price (or more risk, or a less desirable market). Lower cap rate = lower return relative to price (or more stability, or a more desirable market). A 4% cap rate in Manhattan and an 8% cap rate in Birmingham reflect different market risk profiles as much as different returns.
What Cap Rate Does NOT Measure
Cap rate ignores financing. Two investors buying the same 6% cap rate property — one with cash, one with a 7% mortgage — will have dramatically different cash-on-cash returns. Cap rate doesn’t tell you about cash flow after debt service, which is what most investors actually care about.
Cap rate also uses NOI, which excludes mortgage payments but should include all operating expenses (management, taxes, insurance, maintenance, reserves). Sellers sometimes calculate NOI generously — always recalculate using your own expense assumptions.
When Cap Rate Is Most Useful
Cap rate is most useful for comparing multiple properties in the same market, evaluating whether a price is in line with market norms, and tracking value changes over time (if NOI grows and cap rate stays flat, value grows proportionally).
The Bottom Line
Know cap rate, use it for comparisons, but don’t make buying decisions based on it alone. Cash-on-cash return, cash flow after debt service, and your actual reserves matter more for the day-to-day reality of owning a rental property.
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