Managerial accountants define residual income as the amount of operating revenues left over from a department or investment center after the cost of capital used to generate the revenues have been paid. In other words, it’s the net operating income of a department or investment center. You can also think of it as the amount that a department’s profits exceed its minimum required return.
Owning property can earn you passive income for decades to come. Once you purchase a duplex, home, or apartment building as a rental property, you’ll earn a consistent monthly income with little work. Rent should cover your mortgage, taxes, repairs, and other expenses. You’ll continue to earn income by paying off your mortgage with the rent money and saving excess rental income.
What's crazy is that my book income is more than my SF condo-rental income. Yet I didn't have to come up with $1.2 million of capital (the minimum cost to buy my condo today) to create my book. All I needed to create my book was energy, effort, and creativity. I truly believe that developing your own online product is one of the best ways to make money.
In this day and age, managing one’s personal finances in a secure manner that allows the user to have a real-time visual representation of their money is easier than ever before. With the numerous applications that are out there — both free and subscription-based — there’s no reason that every person can’t take control of their money and ensure they’re making smart money moves.

Whether you know how to flawlessly apply eye makeup or build a wooden shelving unit, you can create an online course or video for others to follow. Websites like Udemy and Teachable allow you to build a course, such as how to learn a new language or write a cover letter. Once you build your course and set the price, there’s little work to be done. You’ll receive residual income from each person who signs up to take your course.
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.