
(from the article `progressive tax`) ...defining the time frame over which progressivity should be calculated; a given program may be regressive when examined using annual data but ... ...and profits taxes, which account for about half of all revenue raised from taxation. In contrast, France, Greece, Portugal, and Spain raise only ... ...
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http://www.britannica.com/eb/a-z/s/117

In the US, a federal tax imposed on income and paid equally by employer and employee up to a maximum... <a target=_blank href='http://www.finance-glossary.com/terms/social-security-tax.htm?id=1340&ginPtrCode=00000&PopupMode=false' title='Read full definition of social security tax'>more</a>
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Provides benefits for retired workers and their dependents as well as for the disabled and their dependents. Also known as the Federal Insurance Contributions Act (FICA) tax.
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http://www.irs.gov/app/understandingTaxes/student/glossary.jsp

A portion of the FICA (Federal Insurance Contributions Act) tax that is 12.4% of an individual's net earned income. The employee's share of the Medicare tax is 6.2% of wages up to a certain limit (called the Social Security Wage Base) that increases each year. The employer's share of the Medicare tax is 6.2% of an employee's wages up to that limit....
Found on
http://www.nolo.com/dictionary/social-security-tax-term.html
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