Capitalization Rate (Cap Rate)

Definition

Capitalization rate, or cap rate, is the ratio of a property's annual net operating income (NOI) to its current market value or acquisition price. It expresses the unlevered yield an investor would earn on an all-cash purchase, before financing, taxes, and capital reserves.

Cap rate is the standard yield benchmark in commercial and income real estate. Higher cap rates signal higher risk-adjusted return — typically weaker markets, riskier assets, or distressed conditions. Lower cap rates signal stabilized, institutional-grade assets in strong markets where buyers will accept a lower current yield in exchange for safety and growth.

Cap rate is not a return-on-investment figure for a leveraged buyer, and it should never be used in isolation to decide whether a deal is good. It is one input among many — most useful for comparing similar assets in the same market and for stress-testing exit assumptions.

Formula

Where:

• Net Operating Income (NOI) is the property's annual income from rent and other sources, minus all operating expenses (property tax, insurance, maintenance, management, utilities paid by owner, vacancy reserve). NOI excludes debt service, depreciation, capital expenditures, and income taxes.
• Property Value is either the current market value (for an already-owned asset) or the purchase price (for an acquisition under consideration).

Cap rate is expressed as a percentage. A property with $50,000 NOI valued at $1,000,000 has a 5.0% cap rate.

Worked example

A six-unit residential building generates $84,000 in annual rental income. Operating expenses — property tax, insurance, maintenance, property management at 8% of gross, vacancy reserve at 5% of gross, and owner-paid utilities — total $32,400. Net operating income is $51,600.

If the property's market value is $860,000, the cap rate is:

If market cap rates for similar six-unit assets in the same submarket compress from 6.0% to 5.0% — driven by lower interest rates or higher investor demand — the same NOI now implies a valuation of:

That is a $172,000 gain in implied value without any change in the property's income. This is the mechanic behind cap rate compression, and the reason institutional investors track market cap rates as closely as interest rates.

How to calculate cap rate — step by step

The math is straightforward; the discipline is in computing NOI honestly. Most retail cap-rate calculations are wrong because the NOI is too optimistic.

1. Start with gross scheduled income. Sum all expected rent at market rates, plus any other recurring income (laundry, parking, storage). Use realistic rents, not aspirational ones.
2. Apply a vacancy and credit loss factor. For stabilized properties, 5–10% is typical. For value-add, transitional, or weaker submarkets, 10–15% is more honest. Institutional underwriters rarely go below 5% even on Class-A assets.
3. Subtract operating expenses. Include every line: property tax, insurance, maintenance and repairs, property management, utilities paid by owner, landscaping, snow removal, pest control, trash, accounting, legal, advertising. A 35–45% expense ratio is common for small residential income property. If your number is materially lower, you are missing something.
4. You now have NOI. Do not subtract debt service, depreciation, capital expenditures (roof, HVAC, repaving), or income taxes. Those are below-the-NOI items.
5. Divide NOI by value or purchase price. That is your cap rate.

Cap rates are most reliable when computed on a trailing twelve- month (T12) basis using actual financials, not pro-forma estimates. A “pro-forma cap rate” sold by a broker is often the deal's wishful thinking dressed up in math.

What is a "good" cap rate?

There is no universal answer. A good cap rate depends on asset class, market, condition, and current interest rate environment. Some general ranges as of 2026:

Two practical rules

1. A cap rate that looks too good usually is. A 10% cap on a Class-A asset in a hot metro almost certainly hides deferred maintenance, lease risk, market decline, or fraudulent financials. Cap rates reflect risk; the market is generally efficient at pricing it.
2. Cap rate spread to the 10-year Treasury matters more than the absolute number. A 5.5% cap when the 10-year is at 4.0% is a 150 basis-point spread — historically thin. The same 5.5% cap when the 10-year is at 2.0% is a 350 basis-point spread — historically generous.

Cap rate vs other return metrics

Cap rate is one of four return measures investors use. Each answers a different question:

• Cap rate — “What is the unlevered yield of this property?” Used for asset comparison and exit-value modeling. Ignores financing.
• Cash-on-cash return — “What yield am I earning on the cash I actually invested?” Includes financing impact. The right metric for leveraged buyers focused on current cash flow.
• Internal Rate of Return (IRR) — “What annualized return will I earn over the full hold including sale?” The right metric for institutional investors with a defined hold period and exit assumption.
• Equity multiple — “How many times my invested capital will I receive over the hold?” Common in syndication and private equity contexts.

Cap rate is best at one job: comparing similar income properties at a single point in time. It is poor at predicting investor returns once financing, taxes, and capital expenditures enter the picture.

Cap rate and fix-and-flip exits

Cap rate matters to flippers in two specific situations:

1. BRRRR refinance valuation. When a fix-and-flip operator pivots to a hold, the post-stabilization value depends on prevailing cap rates in the local rental market. A flip that pencils at $300,000 ARV on a sale exit might pencil at $260,000 on a refinance exit if rental cap rates in the submarket are compressed. See BRRRR strategy.
2. Multi-unit conversion. Converting a single-family home into a duplex or triplex shifts the exit from comp-driven ($/sqft) to income-driven (cap rate). A 5.0% market cap rate produces a very different exit value than a 7.0% market cap rate on the same NOI. See Multi-Unit Conversion.

For pure short-hold flips with a sale-comp exit, cap rate is irrelevant — buyers in those transactions are paying for the finished product, not the income.

Common cap-rate mistakes

The same five mistakes show up across deal memos every week:

1. Using pro-forma NOI instead of actual. “After we raise rents to market” is a forecast, not a fact. Lenders and institutional buyers underwrite on T12 actuals.
2. Excluding management cost when the owner self-manages. If the property requires management, it has a management cost. Self-managing means the owner is paying themselves — that is not free.
3. Underestimating vacancy. A 0% vacancy assumption on a small income property is fantasy. Use 5% minimum, more in transitional markets.
4. Confusing cap rate with cash-on-cash return. A 6% cap rate with 75% leverage at 7% interest does not produce a 6% return to the investor. After debt service, the equity yield is materially different.
5. Comparing cap rates across markets and asset classes. A 6% cap in Cleveland is not equivalent to a 6% cap in Austin. Different markets, different risks, different rates.

How DealIntel uses cap rate

DealIntel applies cap rate analysis selectively, where it produces real signal:

• BRRRR refinance modeling. Every BRRRR-strategy evaluation projects refinance value using current local cap rates and stress-tests the outcome against a 100 basis-point compression and expansion scenario. The Kill List flags deals where the refinance valuation depends on cap rate compression to work.
• Multi-unit conversion exits. The Multi-Unit Conversion strategy engine uses local cap rates and prevailing income comps to model the income-driven exit value, then compares it to the cost-driven entry. Deals where the implied income exit is below the cost basis are rejected automatically.
• Cap-rate spread monitoring. DealIntel tracks the spread between local cap rates and the 10-year Treasury, flagging markets where the spread has compressed to historically thin levels. This is one of the inputs to the market-risk score within the Kill List.

DealIntel does not apply cap rate to short-hold Fix & Flip exits, where comp-driven valuation dominates.

Frequently asked questions

Related terms

• After Repair Value (ARV)The estimated market value of a property after planned renovations.
• BRRRRBuy, Rehab, Rent, Refinance, Repeat — long-hold real estate strategy where cap rate drives refinance valuation.
• Cash-on-Cash ReturnThe leveraged equivalent of cap rate, incorporating financing.
• DSCR LoanInvestment-property loan qualified on the property's rental income.
• Comparable Sales (Comps)Recent sales used to estimate the market value of a subject property.