The income approach and capitalization

Income becomes value

The income approach estimates the value of income-producing real estate from its expected benefits. It is especially useful for rental apartments, offices, and shopping centers. The principle of anticipation connects expected future income to present value.

Build net operating income

Begin with annual potential gross income at full occupancy. Subtract an allowance for vacancy and collection losses, then add other income, such as parking revenue, to obtain effective gross income. Subtract operating expenses to obtain net operating income, or NOI. Operating expenses include property taxes, insurance, management, maintenance, and owner-paid utilities. Debt service, the owner's income taxes, and accounting depreciation are excluded. A mortgage payment concerns financing rather than the property's operating performance. Treatment of replacement reserves must be consistent between the income estimate and the market data used to select a rate.

Direct capitalization

Direct capitalization converts a representative single year's NOI into value: Value = NOI / capitalization rate. Express the annual rate as a decimal. The related formulas are NOI = value times rate and rate = NOI / value. A capitalization rate may be extracted from comparable sales using each property's annual NOI divided by its sale price. Evaluate comparability, risk, income expectations, and consistent expense treatment. A cap rate is not simply the mortgage interest rate.

For example, potential gross income is $150,000. Vacancy and collection loss is $10,000, and other income is $5,000. Effective gross income = $150,000 minus $10,000 + $5,000 = $145,000. Operating expenses of $45,000 produce NOI = $145,000 minus $45,000 = $100,000. At an 8% capitalization rate, convert 8% to 0.08, then value = $100,000 / 0.08 = $1,250,000. The capitalized figure is NOI, not gross rent or cash flow after mortgage payments.

Interpret the result

Holding NOI constant, a higher cap rate produces a lower value. Holding the rate constant, higher NOI produces a higher value. Gross rent and gross income multipliers use gross income without separately deducting operating expenses, so they are not NOI capitalization rates. Discounted cash flow analysis separately discounts projected cash flows and resale proceeds over a holding period; direct capitalization uses a representative annual NOI. Neither method guarantees a sale price: the result depends on supportable income, expense, and rate assumptions.