What cap rate measures
Capitalization rate, usually shortened to cap rate, compares a property’s annual net operating income with its value. It is a property-level yield measure: it looks at the income-producing asset before the effects of a particular mortgage, investor tax position, or ownership structure.
The baseline formula is cap rate = annual NOI ÷ property value.
Cap rate is useful because it keeps two assumptions visible: the property’s operating performance and the value used in the denominator. It is not a complete investment return, a forecast of appreciation, or a recommendation to buy or sell.
Start with net operating income
Net operating income, or NOI, is the annual property income remaining after vacancy and recurring operating expenses but before debt service, income taxes, depreciation, and capital structure effects.
DealYield’s baseline cap-rate workflow uses:
- Gross annual rent
- Annual vacancy allowance
- Annual operating expenses
- Property value
The corresponding NOI formula is gross annual rent − vacancy allowance − annual operating expenses.
Operating expenses commonly include property taxes, insurance, routine maintenance, management, owner-paid utilities, association costs, and a reserve assumption. The exact treatment depends on the property and the analyst. Mortgage principal and interest do not belong in NOI because financing is evaluated separately.
Worked example
Assume a property value of $300,000, gross annual rent of $36,000, a $1,800 annual vacancy allowance, and $12,000 in annual operating expenses.
- NOI is
$36,000 − $1,800 − $12,000 = $22,200. - Cap rate is
$22,200 ÷ $300,000 = 0.074. - Displayed as a percentage, the cap rate is 7.40%.
This example demonstrates the arithmetic only. A 7.40% result is not inherently attractive or unattractive; interpretation depends on data quality, property condition, location, risk, expected capital work, and the alternatives available to a particular investor.
Using a target cap rate for valuation context
A target cap rate can be used to explore an implied property value: implied value = NOI ÷ target cap rate.
For example, the same $22,200 NOI at a 7% target produces an implied value of about $317,143. A lower target rate produces a higher implied value when NOI is unchanged, while a higher target produces a lower implied value.
The target is an assumption, not a market fact. DealYield therefore keeps it editable and optional. The calculator can also show the NOI required for a selected property value and target rate when both inputs are present.
What cap rate leaves out
Cap rate does not directly include:
- Mortgage payments, points, or financing fees
- Income taxes, depreciation, or entity structure
- Future rent growth or property appreciation
- Sale costs or a future exit cap rate
- One-time acquisition, renovation, or major capital costs unless the analyst includes an appropriate reserve
- The timing of cash flows within the year
Use the Rental Property ROI calculator when financing and monthly cash flow matter, or the Cash-on-Cash Return calculator when you want to compare annual pre-tax cash flow with cash invested upfront.
Reviewing a cap-rate result
Treat the output as a prompt to audit the assumptions:
- Confirm that rent reflects the same period and unit across every input.
- Make vacancy explicit rather than assuming perfect collection.
- Include recurring operating costs and realistic reserve assumptions.
- Keep debt service outside NOI.
- Stress-test rent or expenses instead of relying on one point estimate.
- Compare the valuation denominator with reliable property and market evidence.
DealYield provides educational estimates. Verify property data and valuation assumptions independently and consult qualified financial, lending, legal, and tax professionals where appropriate.