charge against a citizen's person or property or activity for the support of government

a movement into a higher tax bracket as taxable income increases

income tax paid periodically on income that is not subject to withholding taxes; based on the taxpayer's predicted tax liability

a tax on employees and employers that is used to fund the Social Security system

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

an additional tax on certain kinds of income that has already been taxed