Definition of surtax noun from the Oxford Advanced Learner's Dictionary

 

surtax

 noun
noun
BrE BrE//ˈsɜːtæks//
 
; NAmE NAmE//ˈsɜːrtæks//
 
[uncountable]
 
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a tax charged at a higher rate than the normal rate, on income above a particular level Word Origin late 19th cent.: from French surtaxe (from sur- ‘above’ and tax).
See the Oxford Advanced American Dictionary entry: surtax