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English definition of “supertax”

supertax

noun [C or U]     /ˈsuːpəˌtæks/ TAX
a very high rate of income tax or company tax paid by those with a very high level of income or profit: Introducing a new supertax could help to make up the deficit in the public spending budget.
(Definition of supertax noun from the Cambridge Business English Dictionary © Cambridge University Press)
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