The capitalization rate, or cap rate, is one of the most quoted numbers in income-property real estate. Brokers use it to price buildings, appraisers and lenders use it to value them, and sponsors use it to estimate what a property might sell for later. It is useful and easy to misread.

What a cap rate measures

A cap rate is a property’s annual net operating income divided by its value or purchase price:

Cap rate = net operating income (NOI) ÷ property value

It shows income relative to price, before any financing. The formula also works in reverse, value = NOI ÷ cap rate, which is how many income properties are priced: buyers and appraisers apply cap rates from recent comparable sales to a building’s NOI.

Because it ignores debt, a cap rate describes the property, not the investment. Two buyers can pay the same price for the same building and get very different results, depending on their loans, costs and operations. See debt vs. equity real estate investments.

How NOI is calculated

NOI is what a property earns from operations over a year, after operating costs:

  1. Gross potential income: rent at full occupancy, plus other income such as parking or laundry.
  2. Minus vacancy and credit loss: units that sit empty and rent that goes uncollected.
  3. Equals effective gross income.
  4. Minus operating expenses: property taxes, insurance, repairs and maintenance, owner-paid utilities, property management, payroll and administration.
  5. Equals net operating income.

Two costs usually stay out of NOI, along with depreciation and the owner’s income taxes:

  • Debt service. Loan payments reflect how the owner financed the property, not how it performs. Leaving them out lets you compare buildings regardless of financing.
  • Capital expenditures. Roofs, HVAC systems and full unit renovations are long-lived improvements, usually tracked separately. Many lenders and appraisers deduct an annual replacement reserve when they underwrite a property’s income, so ask which method a number uses.

A worked example

Hypothetical example: a 20-unit apartment building.

  • Gross potential income: $300,000
  • Less vacancy and credit loss (5%): $15,000
  • Effective gross income: $285,000
  • Less operating expenses: $135,000
  • Net operating income: $150,000

If the building sells for $2,500,000, the cap rate is $150,000 ÷ $2,500,000 = 6.0%.

How to read a cap rate

A higher cap rate means a buyer pays less for each dollar of income. A lower cap rate means the buyer pays more.

Hypothetical example: the same $150,000 of NOI valued at different cap rates.

Cap rate Implied value Price per $1 of NOI
5.0% $3,000,000 $20.00
6.0% $2,500,000 $16.67
7.5% $2,000,000 $13.33
10.0% $1,500,000 $10.00
  • A higher cap rate usually signals more perceived risk or slower expected growth. Buyers ask for more income per dollar when they expect that income to be less reliable or slower to grow. A high cap rate is often the market’s price for uncertainty, not a bargain.
  • Cap rate shifts move value a lot. Going from 6.0% to 7.5% cuts the implied value by $500,000, or 20%, with no change in income.

This is why operators focus on NOI. Hypothetical example: at a 6.0% cap rate, each added dollar of annual NOI adds about $16.67 of implied value, so raising NOI by $15,000 a year adds about $250,000, assuming the same cap rate and before the cost of raising it. It works in reverse too: lower NOI or a higher market cap rate reduces value. More in how value-add real estate creates value.

What moves cap rates

Cap rates reflect what buyers are willing to pay. Common drivers:

  • Interest rates. When borrowing costs rise, buyers need more income per dollar of price for a deal to work, so cap rates tend to rise, though not one-for-one and often with a lag.
  • Market liquidity. More active buyers and willing lenders tend to push cap rates down. When capital pulls back, they tend to rise.
  • Property type and class. Apartments, industrial, office and retail each trade in their own ranges. Newer Class A buildings usually trade at lower cap rates than older Class B and C buildings.
  • Location. Large, growing metros with deep tenant demand usually see lower cap rates than smaller or slower-growing markets.
  • Lease terms. A building leased long-term to a creditworthy tenant usually trades at a lower cap rate than one whose main lease expires next year.

Going-in cap rate vs. exit cap rate

The going-in cap rate is usually expected first-year NOI divided by the purchase price; some use trailing 12-month NOI instead. The exit cap rate, or terminal cap rate, is the cap rate a sponsor assumes for a future sale. The estimated sale price is typically the NOI expected in the year after the sale divided by that rate.

Conservative underwriting often assumes an exit cap rate higher than the going-in rate. The building will be older, and no one knows where interest rates or buyer demand will be years from now. A higher exit cap rate means a lower sale price, so the plan doesn’t rely on buyers paying more per dollar of income than today.

Hypothetical example: suppose the building above is expected to earn $180,000 of NOI in the year after a sale.

  • At a 6.0% exit cap rate: $180,000 ÷ 6.0% = $3,000,000
  • At a 6.5% exit cap rate: $180,000 ÷ 6.5% = about $2,770,000

A half-point change in one assumption moves the estimated sale price by about $230,000.

Refinancing uses the same math: the appraisal usually values the property from NOI and a market cap rate, and the loan is limited by that value (loan-to-value) and by income tests such as debt service coverage and debt yield. See how real estate refinancing works.

Common mistakes

  • Comparing cap rates across property types or markets. Different types and markets carry different risks, so their cap rates aren’t directly comparable. Compare like with like: same type, class, market and lease profile.
  • Using pro forma NOI. A “pro forma” cap rate uses what a property could earn after rents rise or vacancies fill. That is a forecast. Start with trailing 12-month actual NOI, then judge whether the plan to raise it is realistic.
  • Ignoring capital expenditures. Because NOI excludes capex, an older property with a failing roof can still show an attractive cap rate. Add the replacement cost to the price and the income per dollar invested falls. Read the inspection reports and capital budget too.
  • Taking the seller’s expenses at face value. In many places property taxes can be reassessed after a sale, and an owner-managed property may show no management fee. Either can make NOI look better than it will be for the next owner.

What a cap rate leaves out

A cap rate is a one-year, before-financing snapshot. It says nothing about leverage, the timing of cash flows, capital spending or the eventual sale. Investors read it alongside other measures, each with its own limits:

  • Cash-on-cash return: annual pre-tax cash flow after debt service, divided by the equity invested. It reflects financing, but like a cap rate it covers one year and ignores the sale.
  • Internal rate of return (IRR): an annualized rate that accounts for the size and timing of every cash flow, from the initial investment through the sale. It rewards getting money back sooner, but doesn’t show how many dollars were earned.
  • Equity multiple: total distributions divided by total equity invested. It shows how much came back, but not how long it took. A multiple below 1.0 means investors got back less than they put in.

Cap rates in MPIRE’s lifecycle

MPIRE’s plans follow a lifecycle: acquire, finance, improve or develop, stabilize, refinance or sell, and distribute. Cap rates show up at purchase, at refinance and at sale. See how MPIRE evaluates an acquisition.

Cap rates also have limits for some assets. Single-family homes and one- to four-unit buildings are usually appraised mainly on comparable sales rather than income, and a vacant buildable lot produces little or no NOI until something is built on it. MPIRE’s Ohio portfolio includes 197 assets, 270 units and 33 buildable lots across ten Ohio markets. Across that many properties and markets, one blended cap rate can hide wide differences between assets.

Questions to ask about a cap rate

  • Is it based on trailing actual NOI or a pro forma forecast?
  • Which operating expenses are included, and are property taxes adjusted for the sale?
  • Does NOI deduct a replacement reserve, and what capital spending does the property need?
  • What exit cap rate does the plan assume, and how does it compare with the going-in rate?
  • How does the plan hold up if the exit cap rate is higher than expected?