sur‧tax /ˈsɜːtæks $ ˈsɜːr-/
noun [uncountable][
Date: 1800-1900;
Language: French;
Origin: surtaxe, from sur- ( ⇒ surcharge) + taxe 'tax']
an additional tax on money you earn if it is higher than a particular amount
[TahlilGaran] Dictionary of Contemporary English ▲