[noun sur-taks; verb sur-taks, sur-taks]
See more synonyms for surtax on
  1. an additional or extra tax on something already taxed.
  2. one of a graded series of additional taxes levied on incomes exceeding a certain amount.
verb (used with object)
  1. to put an additional or extra tax on; charge with a surtax.

Origin of surtax

1880–85; sur-1 + tax; cf. supertax, French surtaxe Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for surtax


  1. a tax, usually highly progressive, levied on the amount by which a person's income exceeds a specific level
  2. an additional tax on something that has already been taxed
  1. (tr) to assess for liability to surtax; charge with an extra tax
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for surtax

"extra tax," 1881, from French surtaxe, from Old French sur- "over" (see sur-) + taxe "tax" (see tax (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper

surtax in Culture


A tax added to an existing tax. To help finance the Vietnam War, for example, Congress imposed a surtax on the federal income tax.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.