
A proportional tax is a tax imposed so that the tax rate is fixed, with no change as the taxable base amount increases or decreases. The amount of the tax is in proportion to the amount subject to taxation. `Proportional` describes a distribution effect on income or expenditure, referring to the way the rate remains consistent (does not progress.....
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http://en.wikipedia.org/wiki/Proportional_tax

(from the article `taxation`) Taxes can be distinguished by the effect they have on the distribution of income and wealth. A proportional tax is one that imposes the same relative ...
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http://www.britannica.com/eb/a-z/p/121

Tax such that the proportion or percentage paid in tax remains constant as income of the taxpayer changes. This contrasts with
regressive tax where the proportion paid falls as income increases, and...
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http://www.encyclo.co.uk/local/20688

A tax that takes the same percentage of income from all income groups.
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http://www.irs.gov/app/understandingTaxes/student/glossary.jsp

Tax which takes an equal proportion of income whatever the taxpayer's income. This contrasts with regressive tax where the proportion paid falls as income increases, and progressive tax where the proportion paid increases. Value-added tax is often said to be an example of a proportional tax
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https://www.encyclo.co.uk/local/21221

A proportional tax, also called a flat tax, is an income taxation system where every taxpayer is subject to the same tax rate regardless of income level or status.
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https://www.myaccountingcourse.com/accounting-dictionary/accounting-diction
No exact match found.