American English

Definition of surtax noun from the Oxford Advanced American Dictionary

 

surtax

 noun
noun
NAmE//ˈsərtæks//
 
[uncountable]
 
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an extra tax on something that has already been taxed, for example tax that is charged at a higher rate than the normal rate, on income above a particular level
See the Oxford Advanced Learner's Dictionary entry: surtax