withholding tax

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A portion of an employee's wages or salary withheld by the employer as partial payment of the employee's income tax.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A withholding, a tax withheld from employees' salary and paid to the government. The withheld amount is considered a credit in final taxation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun income tax withheld from employees' wages and paid directly to the government by the employer