Alternative minimum tax

The alternative minimum tax (AMT) is a supplemental income tax imposed by the United States federal government required in addition to baseline income tax for certain individuals, corporations, estates, and trusts that have exemptions or special circumstances allowing for lower payments of standard income tax. AMT is imposed at a nearly flat rate on an adjusted amount of taxable income above a certain threshold (also known as exemption). This exemption is substantially higher than the exemption from regular income tax.