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Congressional Research Service
informing the legislative debate since 1914


November  20, 2023


The Economic Implications of Moore v. United States


Moore  v. United States (henceforth referred to as Moore) is
a legal case that challenges the constitutionality of the
transition tax imposed with the change in the
international tax system that was included in P.L. 115-97
(commonly  called the Tax Cuts and Jobs Act or TCJA).
The case is currently before the U.S. Supreme Court. The
transition tax is levied on the undistributed profits accrued
by U.S. controlled foreign corporations (CFCs) between
1986 and the end of 2017. The plaintiffs in the case argue
that the taxation of unrealized income violates the Sixteenth
Amendment's   Apportionment Clause. This In Focus does
not discuss the constitutional issues presented in Moore, but
instead focuses on the economic implications presented by
the case.

What Types of Incorme Could be
Affectedb y Moore?
While the plaintiffs in Moore are asking for a narrow ruling
about a specific tax provision, several long-standing tax
provisions also tax unrealized income and could potentially
be affected depending on the wording of a decision in favor
of the plaintiffs. According to a letter from the Joint
Committee  on Taxation (JCT), the potentially affected
provisions could be grouped into two broad categories:
look-through realization and deemed realization.
Look-through realization provisions are those where the
taxpayer is taxed on income received by an entity that is
owned  in full or in part by that taxpayer. The most common
example is that partners are taxed on their share of
partnership earnings even if earnings are not distributed to
partners. If the court rules that taxpayers must either
personally participate in a transaction or receive something
of value in the tax year for the income to be taxable, look-
through realizations provisions that could be impacted,
according to the JCT, include Subpart F, Global Intangible
Low  Taxed Income  (GILTI), Subchapter K (Partnerships),
Subchapter S, and Real Estate Mortgage Investment
Conduits (REMICs).
Deemed  realization provisions are those where income is
recognized for tax purposes but has not been received. They
could be affected if the court rules that a transaction must
actually occur or the taxpayer must receive something of
value in the tax year for the income to be taxable.
According to JCT, relevant deemed realization provisions
could include the original issue discount rule and below-
market and short-term loans, mark-to-market for securities
dealers, mark-to-market for regulated futures contracts,
imputed rental income, and Subchapter L mark-to-market
for life insurance companies. In addition, JCT also
identified the mark-to-market exit tax for expatriates as a
deemed  realization provision for income accrued in prior
taxable years.


Economic Impications
If current tax rules are overturned by the decision, federal
revenues would decline significantly. A recent study by
Eric Toder of the Tax Policy Center (TPC) reported
estimated revenues raised by some of these provisions for
2024 and 2028, some of which are cited below.

International  Tax  Provisions
Three provisions that fall in the look-through category
affect the international tax system and involve the tax
treatment of CFCs, which are foreign corporations that are
owned  at least 50% by U.S. persons that each own 10%.
Prior to the TCJA, owners of CFCs were taxed on income
when  repatriated (paid as a dividend less a credit for income
taxes imposed by foreign countries). The TCJA eliminated
the tax on dividends and imposed a minimum tax aimed at
income from intangibles, known as GILTI. The tax on
GILTI  is estimated by the TPC to raise $15 billion in 2024
and $27 billion in 2028 (as the tax rate increases).
Even before the TCJA changes, the United States, as with
most other countries, had anti-abuse provisions (Subpart F)
that taxed certain types of income that is easily shifted into
low-tax countries. This provision has been in the tax law
since 1962, and is estimated by the TPC to raise $8 billion
in 2024 and $9 billion in 2028. The provisions before and
after TCJA are explained in more detail in CRS Report
R45186, Issues in International Corporate Taxation: The
2017 Revision (P.L. 115-97), by Jane G. Gravelle and
Donald J. Marples.
As part of the transition to the new system, there was a one-
time tax at a lower rate on the accumulated unrepatriated
income, which is the tax at issue in Moore. This tax was
originally estimated to raise $346 billion, and could be paid
in installments over eight years.

Passthrough   Provisions: Partnership,  Subchapter   S,
and  RE  IC
Passthrough businesses, unlike corporations, are not subject
to tax at the entity level. Rather, all income is passed
through and taxed to the owners. Passthrough businesses
include sole proprietors, partnerships, and Subchapter S
corporations (corporations with a limited number of
shareholders that elect to be taxed as a passthrough). The
owners of partnerships and S corporations are taxed on
earnings even if all of the earnings are not distributed.
The TPC  study estimated revenue from undistributed
partnership and S corporation income at $37 billion in 2024
and $57 billion in 2028. Some of this revenue would be
recouped as capital gain on the sale of interests in the
business, which would offset these loses and lead to a net
loss of $23 billion in 2024 and $39 billion in 2028. The
study states that this is a conservative estimate because it

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