an extra tax on something already taxed; esp. a graduated tax on the amount by which an income exceeds a given figure
Origin of surtaxsur- + tax, based on French surtaxe
to levy a surtax on
- An additional tax.
- A tax levied on corporations or individuals after net income has exceeded a certain level.
transitive verbsur·taxed, sur·tax·ing, sur·tax·es
To levy a surtax on.