It was easier recouping the lost $60,000 in rental-property income than I expected. For so long, my primary mindset for passive income was rental income. Having $815,000 less mortgage debt but still generating roughly the same amount of passive income with a much larger cash balance feels great. Further, my passive-income portfolio got even more passive, which is good as a stay-at-home dad to a newborn.

If an investor puts $500,000 into a candy store with the agreement that the owners would pay the investor a percentage of earnings, that would be considered passive income as long as the investor does not participate in the operation of the business in any meaningful way other than placing the investment. The IRS states, however, that if the investor did help manage the company with the owners, the investor's income could be seen as active since the investor provided "material participation." 
As explained by Wikipedia, RIM (residual income model), also referred to as RIV (residual income valuation), is one of the many methods of calculating the actual value of a company. There are numerous approaches to the issue of enterprise valuation—some take a relative approach, while others, like the RIM, are absolute. Relative valuation entails looking at the various metrics of a company and then comparing its standing to that of others in the same industry or market sector. And then, there are absolute valuation methods, like DDM (dividend discount model), DCF (discounted cashflow), and, of course, RIM.
Those who can reap the benefits of residual income have typically put in an immense amount of effort and time in the beginning to be able to enjoy the rewards later on. Residual income, therefore, does not result in instant gratification. Those interested in earning residual income must have a lot of patience and determination to work as hard as necessary to achieve their ultimate goals of a long-standing income stream.
Perhaps a coworker purposefully tries to make your life miserable because they resent your success. Maybe you get passed over for a promotion and a raise because you weren’t vocal enough about your abilities, and mistakenly thought you worked in a meritocracy. Or maybe you have a new boss who decides to clean house and hire her own people. Whatever the case may be, you will eventually tire.
The term “residual income” refers to the income that someone makes after their work has already been completed. An example of residual income is the earnings an author continues to make on a book after it has been published, when fans continue to purchase copies years later. Residual income is ideal because it is money that is being earned while doing nothing in the present moment to earn that money.
The best illustration for this principle is a residential property investment: you renovate a multi-family residence, then collect rent every month. Royalties from creative works (books, films, music recordings) are also a form of residual income. Finally, entrepreneurship comes with a host of residual income-generating opportunities. Say you take after Richard Branson, create 400 companies assign a CEO to each, then let the dollars roll in. Or you create a co-op with professionals in your field, who leverage their results by compensating you for your initial investment in them. Finally, the online world is chockfull of residual income opportunities—but more on that in a separate section below.

In equity valuation, residual income represents an economic earnings stream and valuation method for estimating the intrinsic value of a company's common stock. The residual income valuation model values a company as the sum of book value and the present value of expected future residual income. Residual income attempts to measure economic profit, which is the profit remaining after the deduction of opportunity costs for all sources of capital.
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