The second form of residual income, passive income, is often a vital part of wealth creation. There are only so many hours in each day, and when a person trades hours for dollars, there is a maximum amount of income that person can earn. For instance, if a person earns a specific amount each hour, there is a limit to how many hours are available to work. Once they reach that maximum amount of time, they cannot earn more money.
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." 
Personal residual income, often called discretionary income, is the amount of income or salary left over after debt payments, like car loans and mortgages, have been paid each month. For example, Jim’s take-home pay is $3,000 a month. His mortgage payment, home equity loan, and car loan are the following respective: $1,000, $250, and $200. Using a residual income calculator, Jim would calculate his RI to be $1,550 a month. This is the amount of money he has left over after his monthly debt payments are make that he can put into savings or use to purchase new assets.
Generating passive income is NOT impossible. Passive income was just a dream for me until 2008. That’s when I was let go from my job due to the crumbling economy. With no other options, I bet on myself by trying to make my dream a reality. And you know what? The dream came true, and it’s totally awesome! I get to stay at home with my family, work when I want, and make my own decisions. This lifestyle is possible, and I want you to experience it too.
Passive residual income is generated as a result of little or no direct involvement in the actual creation or production of the money. In essence, passive residual income is income that you may have stirred up, but it is still coming in whether you work or not. With income such as this, you are your own boss, or buying of stocks that pays dividends. You set your own hours and the hours that you do put in are not directly involved in the amount of revenue that you create.
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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