Residual income valuation is a process of business equity evaluation that accurately calculates the cost of equity capital. The primary application of this method is to calculate a rate of return that provides investors and managers a means to measure the compensation for their opportunity cost. Even if a project shows a profit, the residual income valuation may show that this specific project may not have been as profitable as another opportunity.
In equity valuation, residual income represents an economic earnings stream and valuation method for estimating the intrinsic value of a company's common stock. The residual income valuation model values a company as the sum of book value and the present value of expected future residual income. Residual income attempts to measure economic profit, which is the profit remaining after the deduction of opportunity costs for all sources of capital.