You don't have to be Paul McCartney to rack up residuals. You might own properties that you rent out even though you're not a Realtor. Maybe a blog you started took off, and while you no longer work there, you still collect part of the profits. Or perhaps you're a serial entrepreneur who creates companies and moves on. You, too, are earning residual income.
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There are three main categories of income: active income, passive income and portfolio income. Passive income has been a relatively loosely used term in recent years. Colloquially, it’s been used to define money being earned regularly with little or no effort on the part of the person receiving it. Popular types of passive income include real estate, peer-to-peer (P2P) lending and dividend stocks. Proponents of earning passive income tend to be boosters of a work-from-home and be-your-own-boss professional lifestyle. The type of earnings people usually associate with this are gains on stocks, interest, retirement pay, lottery winnings, online work and capital gains. 
The goal of EVA is to quantify the charge, or cost, of investing capital into a certain project or firm and to then assess whether it generates enough cash to be considered a good investment. The charge represents the minimum return that investors require to make their investment worthwhile. A positive EVA shows a project is generating returns in excess of the required minimum return.
If you’re looking for a way to begin gradually replacing your income, these are just some of the best ways you can do it as a physician. Remember the idea of gradual retirement? Passive income streams like the ones mentioned here are perfect ways to allow you to spend more time with family, enjoy your day job more, and, of course, make a little money while you’re at it.
What I’m doing: I view passive income as funny money to keep myself sane during this long journey. I estimate 2-10 years to get to my goal depending on how active I am. The dollars created are just points one can accumulate. I’ve made passive income goals for each passive income type and check in at least once a year like I am now to make sure I’m on track. Passive income is also carefully managed to minimize tax liability. When you can build a buffer for a buffer, you are then free to take more risks.
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.