In June, he put ads on his site with Google Adsense, and within the first hour, earned $1.08 with three clicks. He earned $5 the first day, $7 the second, and then eventually began pulling in $15-$30 a day. In October, he created an ebook exam study guide priced at $19.99. By month’s end, he earned $7,906.55 — more than he had ever previously earned in a month.

The U.S. Internal Revenue Service categorizes income into three broad types, active income, passive income, and portfolio income.[1] It defines passive income as only coming from two sources: rental activity or "trade or business activities in which you do not materially participate."[2][3] Other financial and government institutions also recognize it as an income obtained as a result of capital growth or in relation to negative gearing. Passive income is usually taxable.

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But two months later, with the economy slowing down after the financial crisis, his firm began laying people off, and Flynn was informed that after his current projects were finished, he also would be out of a job. At the same time, he couldn’t help but notice that in the LEED exam forums he had frequented, people were referring to him as an expert and directing questions his way. He began to think he might capitalize on that.
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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