Investing in a business: Another good way to generate passive income is to invest in a business --even a small one -- in return for a percentage of the profits - just like Shark Tank, only smaller. Lending $10,000 to a local business that, for example, is working on a mobile app for Apple phones could lead to a passive income-generated share of the profits when that mobile app starts selling like hot cakes.
Under throughput analysis, the only factor that matters is the impact of a proposed investment on the ability of a business to increase its total throughput (revenue minus totally variable costs). Under this concept, the main focus is on either enhancing throughput through the bottleneck operation or in reducing operating expenses. This analysis requires a consideration of bottleneck usage by the likely mix of products to be manufactured, and their margins. This is a much more detailed analysis than is contemplated under the more simplistic residual income approach.
Flynn, who blogs at Smart Passive Income and discusses his secrets at the Smart Passive Income podcast, defines passive income as “building online businesses that take advantage of systems of automations that allow transactions, cash flow and growth without requiring a real-time presence. We don’t have to trade our time for money one to one. Instead, we invest our time upfront, creating valuable products and experiences for people, and we reap the benefits of that time invested later,” he says, adding, “It’s not easy. I just want to make sure that’s clear.”
Residual income can be calculated by taking the difference between the company's net income and its equity charge, where equity charge is the product of equity capital and the cost of capital. For example, a company has $5 million in net income with $20 million in equity capital and a cost of capital of 10 percent. The equity charge is 10 percent of $20 million, or $2 million. The residual income is $5 million minus $2 million, or $3 million.
If you’re worried about launching a new product, and think you might need some feedback to make it really good, Flynn recommends “pre-selling” an idea — for instance, offering a limited number of spots or seats into, say, a course you create and giving the test group specialized attention so you can see how to improve the content. Once it’s revised (or, if it’s software, once all the bugs are removed), you could open it up to your whole audience.
Residual income is money that is earned on a recurring basis, typically as the result of a single original action. Rather than earning an hourly wage, residual income is typically generated through an initial investment of time or money with the goal of earning continuous payments. Once the initial investment, product, or service is made, the ongoing income that is earned is generally passive in nature.

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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