Cap rate, short for capitalization rate, is a property's annual net operating income divided by its purchase price, expressed as a percentage. It's the single most quoted number in commercial real estate and also one of the most misused, because a cap rate by itself says almost nothing about whether a property is a good buy without knowing what's driving it.
The Calculation Behind The Number
Net operating income is the property's rental income minus operating expenses, before debt service and before depreciation, and cap rate simply divides that figure by the purchase price. A property producing $80,000 in net operating income on a $1,000,000 purchase price has an 8 percent cap rate. The math is simple; the judgment is in trusting the net operating income figure, which depends entirely on realistic vacancy assumptions and a complete accounting of operating expenses, not the seller's optimistic version of either. A buyer should rebuild that net operating income figure independently from the trailing twelve months of actual collections and paid invoices rather than accepting a broker's forward-looking projection at face value.
Why A Lower Cap Rate Isn't Automatically A Worse Deal
Cap rates move inversely with perceived risk and quality, so a lower cap rate usually reflects a more stable asset, a stronger tenant, a better location, or a longer lease term, and a higher cap rate usually compensates a buyer for taking on more risk somewhere in the deal. A well-located medical office building with a long-term tenant might trade at a 6 percent cap rate while a similar-sized building with a shorter lease and weaker credit tenant trades at 8 percent. The higher number isn't automatically the better investment; it's pricing in more uncertainty.
What Cap Rate Doesn't Capture
Cap rate ignores financing entirely, since it's calculated before debt service, so two buyers looking at the same property with the same cap rate can end up with very different cash-on-cash returns depending on their loan terms. It also says nothing about future rent growth, deferred maintenance sitting behind the walls, or lease rollover risk in the next few years, all of which matter more to an investor's actual outcome than the entry cap rate does. Two buildings with an identical entry cap rate can produce very different five-year outcomes depending on when their leases expire and what it costs to re-tenant them.
Using Cap Rate To Compare Properties
Cap rate earns its usefulness as a comparison tool between similar properties in the same market, not as a stand-alone score. Comparing the cap rate on a subject property against recent sales of comparable buildings, similar property type, similar location, similar tenant quality, gives a much more reliable read than looking at the number in isolation. Buyers who skip that comparable-sales step and simply chase the highest available cap rate often end up in the properties everyone else passed on for a reason.
Cap Rate In A 1031 Exchange Search
An investor identifying replacement property inside a 1031 exchange's 45-day window is often comparing several properties at once under time pressure, and cap rate becomes a fast first-pass filter for narrowing that list before a deeper underwriting review. It's particularly relevant when an investor is trading a lower cap rate property, like a well-tenanted retail strip, for a higher cap rate asset class such as industrial or self-storage, since that shift usually means accepting a different risk profile in exchange for more current income, a tradeoff worth understanding clearly before the identification deadline forces a decision. A DST offering typically publishes its underwritten cap rate as part of the sponsor's materials, which gives an exchange investor a comparable figure to weigh against direct-ownership alternatives on the same shortlist.
Common 1031 Exchange Questions
What's considered a good cap rate?
It depends entirely on property type, location, and market conditions. A 5 percent cap rate can be strong for a stable multifamily asset in a supply-constrained market while a 9 percent cap rate might be appropriate for a higher-risk single-tenant retail deal.
Does a higher cap rate always mean a higher return?
Not necessarily. Cap rate reflects income relative to price at a single point in time and doesn't account for financing, future rent growth, or capital expenses that affect the investor's actual return.
How is cap rate different from cash-on-cash return?
Cap rate is calculated before debt service and reflects the property's unlevered performance. Cash-on-cash return factors in the mortgage payment and measures return on the actual cash invested, so the two numbers can diverge significantly on a financed deal.
Can I use cap rate to compare properties in different markets?
Cap rate is most reliable when comparing similar property types within the same market, since baseline cap rates vary by metro area based on local risk and growth expectations.
Why do cap rates matter more during a 1031 exchange search?
The 45-day identification window forces fast comparisons across several potential replacement properties, and cap rate offers a quick way to screen options before committing time to full underwriting on any one of them.
