Definition of "supertax" []

• An additional tax on something that has already been taxed (noun)
• A higher rate of an existing tax (noun)

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• "Darling plans windfall 'supertax' - PA Guardian. co.uk"
• "Press Association Darling plans windfall 'supertax' - 33 mins ago"
• "Britain's Labour government outraged the country's bankers today by unveiling a one-off, so-called supertax on bank bonuses."