Surtax

n.	1.	An additional or extra tax.
v. t.	1.	To impose an additional tax on.

Noun	1.	surtax - an additional tax on certain kinds of income that has already been taxed Synonyms: supertax
Verb	1.	surtax - levy an extra tax on; "surtax luxury items that cost more than $1,000"

assessment, cess, conscience money, contribution, direct tax, duty, graduated taxation, imposition, impost, indirect tax, joint return, levy, progressive tax, separate returns, single tax, supertax, tax, tax base, tax dodging, tax evasion, tax exemption, tax return, tax structure, tax withholding, tax-exempt status, taxable income, taxation, tithe, toll, tribute, withholding tax