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English definition of “surtax”

surtax

noun [U] uk   /ˈsɜː.tæks/ us    /ˈsɝː-/
an extra tax that is paid by people who earn more than a particular large amount, or an extra tax that is added to something that is already taxed: a surtax on company profitsTaxation
(Definition of surtax from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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