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           SCongressional                                             ______
           ~ ~Research Service






Supreme Court Considers Scope of Congress's

Sixteenth Amendment Income Taxing Power

in   Moore v. United States



January   8, 2024

On December 9, 2023, the Supreme Court heard oral argument in Moore v. United States, an appeal
challenging a one-time Mandatory Repatriation Tax (MRT) on U.S. shareholders of a foreign
corporation for accumulated, but undistributed, earnings of the corporation. The taxpayers ask the Court
to invalidate the MRT as a tax on unrealized income because the Sixteenth Amendment, they argue, has
a realization requirement, meaning that the taxpayer must receive or enjoy an economic gain for earnings
to qualify as income. The government argues that the Sixteenth Amendment contains no such realization
requirement and that other taxes Congress has enacted would be invalidated should the Court agree with
the taxpayers' interpretation.
Moore has attracted attention from Congress, tax law practioners, and the general public over how a broad
ruling from the Court could expand or constrain Congress's power to tax income under the Sixteenth
Amendment.  This Legal Sidebar provides an overview of the constitutional jurisprudence at issue in this
case, as well as a discussion of the specific facts and arguments raised in Moore, including the Justices'
questioning at oral argument. It also highlights concerns the case has generated. The Sidebar concludes by
discussing the potential implications of Moore for Congress.

Legal   Background

Article I, Section 8, Clause 1 of the U.S. Constitution authorizes Congress  [t]o lay and collect Taxes,
Duties, Imposts and Excises. Section 2, Clause 3 and Section 9, Clause 4 of Article I limit this power,
however, so that direct Taxes shall be apportioned among the several States which may be included
within this Union, according to their respective Numbers and [n]o Capitation, or other direct, Tax shall
be laid, unless in Proportion to the Census. Thus, under the rule of apportionment applicable to direct
taxes, amounts raised by a direct tax must be divided among the states according to each state's
population.




                                                              Congressional Research Service
                                                              https://crsreports.congress.gov
                                                                                 LSB11100

CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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