An additional tax on certain kinds of income that has already been taxed

• Additional levy
• Penalty for the ultrarich

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Supertax \Su"per*tax`\, n. [Super- + tax.] A tax in addition to the usual or normal tax; specif., in the United Kingdom, an income tax of sixpence for every pound in addition to the normal income tax of one shilling and twopence for every pound, imposed, ...

WordNet Word definitions in WordNet
n. an additional tax on certain kinds of income that has already been taxed [syn: surtax ]

Wiktionary Word definitions in Wiktionary
n. 1 An additional tax on something that has already been taxed 2 A higher rate of an existing tax