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Updated December 4, 2017


Tax Reform: The Alternative Minimum Tax


The 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 twice-once under the rules for the regular
income tax and once under the AMT rules and 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.


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
corporation's alternative minimum taxable income less an
exemption amount. A corporation's alternative minimum
taxable income is the corporation's 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 drilling
costs) and the special deduction for Blue Cross and Blue
Shield companies. In 2013, the most recent year available,
the adjustments reduced AMT taxable income relative to
regular taxable income, while the preference items resulted
in greater AMT taxable income. A corporation must pay the
AMT if the computation of tax under the AMT is greater
than the computation of its tax under the regular tax. The
corporate AMT serves to limit the use of tax preferences to
reduce tax on retained, as well as distributed, earnings. The
corporate AMT allows a credit for prior year corporate
AMT payments and also exempts small business
corporations (with gross receipts averaging less than $7.5
million per year) entirely.

Corpsort ,,eAMT R&vorna~
As shown in Table 1, the corporate AMT revenues were
roughly 1% of corporate tax receipts in both 2003 and
2013. In these years, firms paying the corporate AMT were
less than 2% of all corporations.

Table I. Selected Corporate Income Tax Statistics

                               2003           2013

Number of Returns               5,401,237      5,887,804
Number of AMT Returns              9,564          10,222
Total Tax Liability ('000s) $241,275,165  $437,372,463
AMT Liability ('000s)         $2,298,776      $4,197,924
Source: Department of the Treasury, Internal Revenue Service,
Corporation Complete Book, 2003 and 2013, Table 2 and Table 23.


The modern individual AMT originated with the Revenue
Act of 1978 (P.L. 95-600) and operated in tandem with an
existing add-on minimum tax prior to its repeal in 1982.
Table 2 details selected key individual AMT parameters.

Table 2. Selected Individual AMT Parameters, 2017

                  Single/     Married
                  Head of      Filing    Married Filing
                Household      Jointly     Separately

Exemption           $54,300     $84,500         $42,250
28% bracket         187,800     187,800          93,900
threshold
Source: Internal Revenue Code.

The individual AMT tax base is broader than the regular
income tax base and starts with regular taxable income and
adds back various deductions, including personal
exemptions and the deduction for state and local taxes. In
addition, the individual AMT restricts the use of selected
tax preferences, such as tax-exempt interest from qualified
private activity bonds and accelerated depreciation.
Taxpayers deduct the AMT exemption amount to determine
their AMT taxable income. To this measure of income
taxpayers apply a two-tier rate structure with rates of 26%
and 28% to determine their personal AMT liability; they
pay the higher of their regular or AMT liability.


As shown in Table 3 the individual AMT revenues were
between 1.5% and 2% of individual tax receipts in 2004
and 2014. In those years, tax filers paying the individual
AMT were 2.3% (in 2004) and 2.9% (in 2014) of all tax
filers.

Table 3. Selected Individual Income Tax Statistics

                            2004             2014

Number of Returns           132,226,042      148,606,578
Number of AMT                 3,096,299        4,277,624
Returns
Total Tax Liability       $884,342,703    $1,432,797,923
Before Credits
AMT Liability              $13,029,239       $28,645,905
Source: Department of the Treasury, Internal Revenue Service,
Individual Income Tax Complete Book, 2004 and 2014, Table 1.4.

Due to its design, a taxpayer is more likely to face the
individual AMT if they reside in a high tax state or if they
have children. Also, since the graduated regular income tax


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