/ Thesaurus / E Synonyms of estimated tax Find synonyms for: Noun1. estimated tax, income taxusage: income tax paid periodically on income that is not subject to withholding taxes; based on the taxpayer's predicted tax liabilityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language