What Is Income Approach?
The income approach says: Value = NOI ÷ cap rate. A duplex with $26,400 annual NOI in a 6.5% cap market is worth $406,154. It's the primary method for valuing rental property and investment property because it captures what buyers actually pay for income. Select the cap rate from comparable sales in the same market and property type. A 0.5% cap rate swing changes value by roughly 8%.
The income approach values a property by dividing its net operating income (NOI) by a capitalization rate (cap rate)—reflecting what income-oriented buyers will pay for the stream of cash flow.
At a Glance
- What it is: Valuation method: Value = NOI ÷ cap rate
- Why it matters: Primary method for rental property; reflects income buyer behavior
- Key inputs: NOI (stabilized), cap rate (from market comps)
- Best for: Multifamily, SFR rentals, any income-producing property
- Limitation: Requires accurate NOI and appropriate cap rate selection
Value = NOI ÷ Cap Rate
How It Works
The formula. Value = NOI ÷ Cap Rate. NOI is gross rental income minus operating expenses—before debt service. Cap rate is the market's required return for that property type and location. Lower cap rate = higher value (buyers accept lower yield for perceived safety or growth).
Getting NOI right. Use stabilized numbers—full occupancy, market rents, realistic operating expenses. Don't use pro forma rents if the property is under-rented; either adjust to market or value as-is. Vacancy and operating expense ratios matter.
Selecting the cap rate. Pull comparable sales of similar properties, back out the cap rate (NOI ÷ Sale Price) for each, and use the range. A 4-plex in Dallas might trade at 5.8–6.5%; a Class C in a tertiary market might be 8–10%. Property type, location, and condition drive the spread.
Real-World Example
Ava's income approach in Charlotte. Subject: 6-unit, gross rental income $72,000, operating expenses $28,800, NOI $43,200. Three comparable 6-units sold at implied cap rates of 6.2%, 6.5%, and 6.0%. She used 6.4% (slightly conservative). Value = $43,200 ÷ 0.064 = $675,000. The listing was $689,000. She offered $655,000 citing the income approach and closed at $662,000.
Pros & Cons
- Aligns with how rental property investors value deals
- Captures income stream—the reason investors buy
- Straightforward formula; easy to sensitivity-test (cap rate up/down)
- Comparable sales provide cap rate data
- Works for any income-producing property
- 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
- For owner-occupied or value-add, sales comparison may be more relevant
Watch Out
- Pro forma trap: Sellers often inflate NOI with projected rents and trimmed expenses—verify every line item
- Cap rate compression: In hot markets, cap rates fall; use recent comps, not 2-year-old data
- Apples to apples: Compare same property type and class; a Class A cap rate doesn't apply to Class C
Ask an Investor
The Takeaway
The income approach is the workhorse for rental property valuation. Value = NOI ÷ cap rate. Get NOI right, select the cap rate from comparable sales, and you have a defensible value estimate.