The federal individual income tax is levied on the worldwide income of
U.S. citizens and resident aliens and on certain types of U.S. source
income of nonresidents. For a nonitemizer, “tax table income”
is adjusted gross income less $3,000 for each personal exemption and the
standard deduction. If a taxpayer itemizes, tax table income is adjusted
gross income minus total itemized deductions and personal exemptions. In
addition, individuals may also be subject to the alternative minimum
tax.