The net operating income is the amount of money that has been made once all of the person’s expenses have been subtracted from it. For instance, in order for an author to determine his net operating income, he would have to deduct the costs involved in creating the book from the amount that he earned. Designing the book cover, editing the book, and publishing the book are all examples of these kinds of expenses.
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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.