[20171204]IF10705_税收改革：替代最低税.pdf

https:/crsreports.congress.gov Updated December 4, 2017Tax Reform: The Alternative Minimum TaxThe U.S. federal income tax has both a personal and a corporate alternative minimum tax (AMT). Both the corporate and individual AMTs operate alongside the regular income tax. They require taxpayers to calculate their liability twiceonce under the rules for the regular income tax and once under the AMT rulesand then pay the higher amount. Minimum taxes increase tax payments from taxpayers who, under the rules of the regular tax system, pay too little tax relative to a standard measure of their income. Corporate AMT The corporate AMT originated with the Tax Reform Act of 1986 (P.L. 99-514), which eliminated an “add-on” minimum tax imposed on corporations previously. The corporate AMT is a flat 20% tax imposed on a corporations alternative minimum taxable income less an exemption amount. A corporations alternative minimum taxable income is the corporations taxable income determined with certain adjustments (primarily related to depreciation) and increased by the disallowance of a number of preference items, primarily related to extraction activities (depletion and expensing of intangible dr