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. 

Most credit card companies offer sign-up bonuses to entice you to open a credit account with them. As long as you don’t spend money just to hit the minimum balance and always pay your balance on time, this can have a minimal impact on your credit score while earning you hundreds – or even thousands – of dollars a year. Some of the best travel credit cards offer 100,000 points to new accounts when you meet reasonable spending requirements.
The most liquid of the private investments are investing in equity or credit hedge funds, real estate funds, and private company funds. There will usually be 6 month – 3 year lockup periods. The least liquid of the private investments are when you invest directly into private companies yourself. You might not be able to get your money out for 5-10 years, depending on the success of the company and upcoming liquidity events.
When you create residual income, you are taking a step towards making extra money in a manner that does not require constant effort. The stream of income is actually generated from something specific; a specific effort that you put forth to create the stream of income opportunity in the first place. Residual income is not always a passive manner of making money.
When done correctly, investing can be a great way to generate residual income. There are many different types of investments you can choose from to earn income passively — whether you choose to purchase high dividend stocks, try peer to peer lending, or choose to invest in real estate. No matter what you choose to do, make sure you do your research first and talk to a tax advisor to ensure you understand your specific situation and what option is best for you.
Regardless of which investment strategy you decide to pursue to earn residual income, an essential part of the investment process is careful due diligence of each opportunity as it arises and working hard to remove any pre-existing biases. Take your time to figure out which approach makes the most sense for you, and carefully calculate your residual income goals. Remember that diversification using different asset classes is one of the most effective ways to build stable and viable streams of residual income, and a profitable portfolio.

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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