Department C has earned $142.5 million residual income as compared to $40 million earned by department P. Residual income allows us to compare the dollar amount of residual income earned by different departments. Since the residual income in both cases is positive, we conclude that both have met the minimum return requirements. However, with residual income is not easy to compare performance.
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." 
Domain names cannot be replicated. If one is taken, the only recourse would be to approach the owner to discuss a sale. While there are other variations you could choose, sometimes owning a certain domain (especially if it is attached to your business) can be worth the premium. Often, people will scout out domain names that are still available, buy them, and then sit on them in order to sell them down the road. Depending on who may want the domain down the road, you could sell it for a large markup.
2. Real Estate: Real estate is #2 for one simple reason, leverage – using smart debt and other people’s money. When looking at real estate rents and the potential for income real estate provides, it is the trifecta of residual income. First, a home or rental property can appreciate, so capital appreciation is the first long-term benefit of owning a home. Second, rent. Other people are paying the mortgage, insurance, property taxes and maintenance while you own that piece of real estate. Third, tax protection. Rental income is taxed at a lower rate than ordinary income and you can depreciate real estate by taking a paper deduction on your annual tax return not to mention expensing the cost of mileage, mortgage interest, and updates to the property. Rentals done right can generate almost double what the stock market can in dividends and interest. The fourth and maybe most hidden, but important benefit is that over time rent’s rise, protecting your cash-flow against inflation, while your mortgage interest can be at a fixed rate potentially.
Ask yourself how many hours a week do you spend sitting in silence, coming up with an idea and working on your idea? We’re so busy with our jobs that our childhood creativity sadly vanishes at some point in our lives. There are food bloggers who clear over $15,000 a month. There are lifestyle bloggers who make over $10,000 a month while living in Thailand. And there are even personal finance bloggers who’ve sold their sites for multi-millions.

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.
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