
Passive income is an income received on a regular basis, with little effort required to maintain it. It is closely related to the concept of `unearned income`. The American Internal Revenue Service categorizes income into three broad types, active (earned) income, passive (unearned) income, and portfolio income. It defines passive income as only.....
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http://en.wikipedia.org/wiki/Passive_income

Income (such as investment income) that does not come from active participation in a business. Specified by the U.S. tax code.
Found on
http://www.duke.edu/~charvey/Classes/wpg/bfglosp.htm

Includes income derived from such sources as dividends, interest, royalties, rents, amounts received from personal service contracts, and income received as a beneficiary of an estate or trust.
Found on
https://www.encyclo.co.uk/local/21071
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