When I started building my architecture-related business in 2008, I made my first dollar through advertising. I’d spent a lot of time and money building the site and getting traffic. Then one day I threw an ad on the site one day, and I made $1.18. Sure, I could find that much under my couch cushions—but that’s not the point! The point is that I was able to build something online, put an ad up, and make money without having to do anything. I learned it was possible, and it motivated me to move forward.

Passive income, after everything is set needs no associated cost. Sure, it’s going to take considerable time upfront, but you don’t even have to work it every day. You can begin part-time and as your revenues build and take over your current main income, begin the transition to working as an entrepreneur full-time. And, typically, this type of recurring monthly income won’t lock you down to a specific location and you can work from anywhere you have a laptop and Internet connection.
Managerial accounting defines residual income in a corporate setting as the amount of leftover operating profit after all costs of capital used to generate the revenues have been paid. It is also considered the company's net operating income or the amount of profit that exceed its required rate of return. Residual income is normally used to assess the performance of a capital investment, team, department or business unit.