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.

I think it’s funny how 1500 is the amount of extra income you mention because that’s what I’m shooting for! If I can make that much more each month to supplement my regular income, I will have almost all of my school debt payed off in one year! I’m really motivated. I use Mechanical Turk with Amazon to perform menial task and get a few extra bucks. I also use Varolo which is a fairly new idea. I really think it has potential. If you don’t mind me promoting it, here it goes.
I think you should use Financial Samurai to raise your passive income. You’ve already proven that you writing 3 articles a week is enough to not only sustain the site but grow it. Why not have more guest writers post articles? Since you started with the extra post each week I’m guessing traffic is above your normal growth rate. Leverage that up with more posts and my bet traffic will continue to grow.
The key thing to note in those various streams is how few of them rely on my active participation on a daily basis and how they are fueled from savings. My active participation is in the blogs and $5 Meal Plan. Everything is passive, outside of routine maintenance like updating my net worth record, and none of them would be possible if I didn't have the savings to invest it.
In my situation, I knew that I would be leaving San Diego and quitting my job many months in advance. I knew when we’d be leaving but I didn’t know where we’d be heading(since my fiancee was applying to med school). That really forced me to think outside of the box and come up with some unique ways to make money, independent of our future location. I could have sat back and hoped that she got into a school in a city where I could find work as an engineer but I didn’t want to rely on chance.
I also noticed that in your passive income chart at the bottom that you don’t include your internet income other than sales from your book. Is there a reason for that? Do you not consider is passive because you are actively blogging all the time to create it? Or do you just not want readers to know how much money you generate from blogging activities?

You can uses tools such as Wordpress for your website platform. MailChimp to collect email addresses. Clickfunnels to create funnels and landing pages that are completely automated. Stripe to process payments. These are just a few tools I use but there are many more options for each part of your business. Find the ones that work for you and help you create systems. (Disclaimer: I was not paid to mention any of these companies).
Working as a nurse or a computer engineer for a salary are two examples of active income. In contrast, residual income is income from an investment that earns over the minimum rate of return. You get paid for work you completed once or are periodically overseeing. With residual income, you don’t have to be present or intricately involved to get paid.
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.
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