What a Cap Rate Tells You
The capitalization rate expresses a property's annual return as if you had paid all cash — no mortgage, no leverage, just the income the asset throws off against what it costs. That makes it the cleanest way to compare two income properties on equal footing, because it strips out how each one happens to be financed. The formula this calculator runs is two steps:
First, net operating income: annual gross rent minus annual operating expenses. Then the cap rate: NOI divided by the purchase price, expressed as a percentage. A property earning $27,000 of NOI on a $320,000 price carries a cap rate of about 8.4%. The higher the cap rate, the more income you buy per dollar of price — and, usually, the more risk or the softer the market that comes with it.
What Belongs in Operating Expenses — and What Does Not
The accuracy of a cap rate lives or dies on the expense number, and this is where deals are most often misrepresented. Operating expenses include property taxes, insurance, property management, repairs and maintenance, utilities the owner pays, and a realistic allowance for vacancy. They do not include your mortgage payment, because the cap rate is deliberately measured before financing, and they do not include one-time capital improvements or depreciation. A seller's pro forma that shows a suspiciously low expense ratio — anything far below roughly a third of gross rent for a typical residential-style rental — deserves scrutiny, because trimming expenses is the easiest way to make a cap rate look better than the property earns.
Reading the Number in Context
There is no universal "good" cap rate, and any source that quotes one without naming a market is guessing. Cap rates are set by the local market for each asset class and location: a stabilized building in a strong, low-vacancy metro trades at a low cap rate because buyers accept a smaller yield for safety and growth, while the same building in a weaker market trades at a higher cap rate because buyers demand more income for the added risk. The useful move is to compare your subject property's cap rate to recent sales of similar assets in the same submarket. If comparable buildings are trading around 7% and your target pencils at 9%, that gap is either an opportunity or a warning — and the reason for it is worth understanding before you buy.
Cap rate also works in reverse, which is why it is so central to commercial valuation. If the market prices a class of asset at 8%, then a property producing $27,000 of NOI is worth roughly $337,500 — divide the income by the market cap rate and you have an implied value. That relationship is why raising NOI, through higher rents or lower expenses, increases value directly, and why value-add operators focus so heavily on the income line.
From Cap Rate to Financing
Cap rate measures the asset; it does not measure your financed return or tell you what a lender will do with the deal. For that, the property has to clear debt coverage as well — run it through the DSCR calculator to see whether the income covers the debt service, and the cash flow calculator to see what actually reaches you after the loan. When a commercial deal holds together, the commercial real-estate financing path covers acquisition, refinance, and value-add on income property. For apartment and larger residential income deals, the multifamily financing path is built around exactly this kind of NOI-driven underwriting. Any specific leverage, minimum yield, or program threshold is confirmed per transaction rather than quoted here: {{CLAIM:commercial.property_types}} — confirming against current program sheet.