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 the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.