Alternative Minimum Tax (AMT)

A separate tax calculation in which a taxpayer must pay the higher of its regular tax or AMT liability. The corporate AMT rate- although lower than the regular tax rate- is applied to a different- typically higher- taxable income than for regular taxes. Introduced in 1969- The Tax Reform Act of 1986 substantially modified the AMT- which all taxpayers must calculate. In 1997- AMT shortened accelerated depreciation preference item from ADR class life to MACRS life.