What Is Cap Rate Analysis?
Cap rate analysis uses the income approach: Cap Rate = NOI ÷ Value (or Value = NOI ÷ Cap Rate). You verify NOI from rent roll and operating expenses, then select a cap rate from comparable sales in the same market. A fourplex with $28,000 NOI in a 6.5% cap market is worth $430,769. Cap rate analysis tells you if the asking price is fair—or if you're overpaying. Pair with gross rent multiplier and operating expense ratio for a full deal analysis picture.
Cap rate analysis is the process of estimating or verifying a property's capitalization rate using NOI and comparable sales to value the deal and compare it to market.
At a Glance
- What it is: Process of estimating/verifying cap rate for property valuation
- Why it matters: Primary method for valuing rental property
- Formula: Cap Rate = NOI ÷ Value; Value = NOI ÷ Cap Rate
- Key inputs: NOI (stabilized), cap rate from comparable sales
- Complement: Gross rent multiplier, operating expense ratio
Cap Rate = NOI ÷ Property Value
How It Works
Get NOI right. NOI = gross rental income − operating expenses. Use stabilized numbers—market rents, full occupancy, realistic operating expenses. Don't use pro forma if it's inflated. Verify rent roll and operating expenses line by line.
Select cap rate. Pull comparable sales of similar properties. Back out cap rate: NOI ÷ Sale Price for each. Use the range. A 4-plex in Dallas might trade at 5.8–6.5%. Class C in tertiary market might be 8–10%. Property type, location, and condition drive the spread.
Value and compare. Value = NOI ÷ Cap Rate. Compare to asking price. If asking is $450,000 and your analysis says $430,000, you're overpaying—or NOI is understated. Cap rate analysis is the core of income approach property valuation.
Real-World Example
Ava's cap rate analysis for a Charlotte fourplex. Rent roll: $4,200/month ($50,400/year). Operating expenses: $18,900 (40% of gross—includes vacancy 5%). NOI $31,500. Three comparable fourplexes sold at implied cap rates 6.2%, 6.5%, 6.0%. She used 6.4%. Value = $31,500 ÷ 0.064 = $492,188. Asking was $485,000. Cap rate analysis supported the price—she offered $470,000 and closed at $478,000.
Pros & Cons
- Primary method for rental property property valuation
- Income approach reflects how income buyers value
- Comparable sales provide cap rate data
- Straightforward—easy to sensitivity-test
- Complements gross rent multiplier and operating expense ratio
- Garbage in, garbage out—wrong NOI or cap rate produces wrong value
- Cap rate selection is judgment; 0.5% swing = ~8% value change
- Doesn't capture appreciation or forced appreciation potential
- Pro forma NOI can be inflated
Watch Out
- Pro forma trap: Verify NOI line by line—sellers often trim operating expenses and inflate rents
- Cap rate compression: In hot markets, cap rates fall—use recent comparable sales
- Apples to apples: Compare same property type and class; Class A cap ≠ Class C
Ask an Investor
The Takeaway
Cap rate analysis is the core of income approach property valuation. Value = NOI ÷ Cap Rate. Get NOI right, select cap rate from comparable sales, and you have a defensible value. Deal analysis starts here.