Cap rate real estate calculations look simple: net operating income divided by purchase price. The number is easy to compute and easy to misuse, because it collapses a property's financing, location, and risk profile into one figure that on its own tells a buyer less than the shorthand implies. It's a useful first filter for comparing listings quickly, but treating it as the final word on a deal is where most buyers get into trouble.
The Calculation Itself
Net operating income is gross rental income minus operating expenses, before debt service and before income tax. Divide that by the purchase price and the result is the cap rate, expressed as a percentage. A property producing $60,000 in NOI on a $1,000,000 purchase price has a 6% cap rate. The calculation says nothing about how that purchase is financed, which is exactly where it starts to mislead an unwary buyer. It also assumes the NOI figure itself is accurate, which is not always a safe assumption depending on who prepared it.
Why It Ignores Financing Entirely
Cap rate is calculated as if the entire purchase were paid in cash, so it doesn't reflect the actual cash-on-cash return an investor gets when a chunk of the purchase price is financed. Two properties with identical 6% cap rates can produce very different returns on the buyer's actual invested capital depending on the loan terms each one carries, which is why cap rate is a screening tool, not a final answer, on any deal that involves debt.
How Louisville Submarkets Move the Number
Cap rates compress in submarkets where buyer demand is strong relative to available inventory and expand where risk or vacancy concerns push prices down relative to income. A stabilized multifamily asset in St. Matthews or Hurstbourne typically trades at a tighter cap rate than a comparable property in a submarket with thinner rental demand, because buyers are willing to accept a lower current yield for the perceived stability. Neither number is right or wrong; they reflect the market pricing risk differently.
Where the Number Breaks Down
A cap rate built on a seller's optimistic NOI, one that assumes no vacancy, minimal repairs, and rent at the top of the market, will look better than the property actually performs once a buyer runs their own numbers. Deferred maintenance is another blind spot: a roof or HVAC system near the end of its life doesn't show up in a trailing twelve-month NOI calculation but will hit the buyer's cash flow the year after closing. A buyer who treats the seller's stated cap rate as verified fact, rather than as a starting point to underwrite independently, is the one most likely to be disappointed.
Using Cap Rate to Compare an Exchange Replacement Property
An investor exchanging out of a Louisville-area property and into a replacement under 1031 rules still needs to compare cap rates across candidate properties the same way any buyer would, adjusted for financing, deferred maintenance, and submarket risk. The exchange's tax deferral doesn't change whether the replacement property is a sound deal; that underwriting still has to hold up on its own before the identification deadline passes.
Common 1031 Exchange Questions
What is considered a good cap rate?
There's no universal good number; it depends on asset type, location, and risk tolerance. A stabilized property in a strong submarket might trade at a 5-6% cap rate while a higher-risk or secondary-market asset might need to offer 8% or more to attract buyers.
Does cap rate account for my mortgage payment?
No. Cap rate is calculated on net operating income before debt service, so it doesn't reflect the actual cash flow an owner receives after making loan payments.
Why do cap rates differ between Louisville neighborhoods?
Cap rates reflect how much risk and stability buyers perceive in a given submarket. Areas with stronger rental demand and lower vacancy typically see tighter cap rates because buyers accept a lower current yield for that stability.
Can I trust the cap rate a seller lists in the marketing package?
Verify it independently. Seller-provided NOI figures sometimes assume minimal vacancy or exclude near-term capital expenses, which inflates the stated cap rate compared to what a buyer will actually realize.
Does cap rate matter when buying a 1031 exchange replacement property?
Yes. The exchange defers the tax on the sale but doesn't guarantee the replacement property is a sound investment, so the same cap rate and NOI underwriting applies before identifying or closing on a replacement.
