Cap rate -- your annual net operating income divided by the purchase price -- is the key metric for evaluating investment property value. A $600K property generating $36K in annual net income has a 6% cap rate, and whether that's a good deal depends on your market and risk tolerance.
What Is a Cap Rate?
Cap rate is simple: It's annual net operating income divided by property price.
Formula: Cap Rate = Net Operating Income (NOI) / Purchase Price
Example:
- Annual rent: $48K ($4,000 x 12 months)
- Operating expenses: $12K (taxes, insurance, maintenance, vacancy)
- Net Operating Income: $36K
- Purchase price: $600K
- Cap Rate: 36K / 600K = 6%
What Cap Rate Means
A 6% cap rate means you're getting 6% annual cash return on your investment.
In 2025:
- Mortgage rates: ~6.3%
- Stock market returns (historical): ~10%
- Cap rates on rental properties: 4-7% depending on location/quality
A 6% cap rate is reasonable. It covers your mortgage costs plus some profit.
How Appraisers Use Cap Rates
For investment properties, I use the income approach:
- Calculate annual net operating income
- Determine market cap rate for similar properties
- Divide NOI by market cap rate = appraised value
Example:
- NOI: $36K
- Market cap rate for this neighborhood: 6%
- Appraised value: 36K / 0.06 = $600K
This is how investment properties are appraised differently than owner-occupied homes.
Why Cap Rates Matter
A property with low cap rate is:
- More expensive relative to income
- Suitable for long-term hold investors
- Relying on appreciation, not cash flow
A property with high cap rate is:
- Cheaper relative to income
- Generating more cash flow
- Better for income-focused investors
Market Rates by Region
In my experience:
- Coastal premium properties: 4-5% cap rate (appreciation play)
- Suburban rental properties: 5-6% cap rate (balanced)
- Inland/less desirable: 6-7% cap rate (income focused)
Higher cap rates mean more income relative to price.
Using This Knowledge
When you're evaluating a rental property:
- Calculate the NOI (rent - expenses)
- Look at comparable rental properties' cap rates
- If the property's cap rate is below market, it's expensive
- If the property's cap rate is above market, it's a bargain
Example Comparison
Property A: $600K, $36K NOI, 6% cap rate Property B: $600K, $42K NOI, 7% cap rate
Same price, but Property B generates more income.
Which would you prefer?
Most investors prefer Property B (higher cap rate = more cash flow).
Appraiser Perspective
When I appraise investment properties, I:
- Verify rental income (not asking prices, actual rents)
- Calculate realistic operating expenses
- Derive NOI
- Apply market cap rates
- Estimate property value
This method is based on market data, not guesswork.
Bottom Line
Cap rates are the metric for investment property value.
Understand them, use them, and you'll make better investment decisions.
The income approach is how professional appraisers value rentals.
And you should use it too.