This is an important concept in personal finance because banks typically use this calculation to measure the affordability of a loan. In other words, does Jim make enough money to pay his existing bills and an additional loan payment? If Jim’s RI is high, his loan application will have a greater chance of being approved. If his RI is low, he will probably get rejected for the loan immediately.
Residual income is calculated as net income less a charge for the cost of capital. The charge is known as the equity charge and is calculated as the value of equity capital multiplied by the cost of equity or the required rate of return on equity. Given the opportunity cost of equity, a company can have positive net income but negative residual income.