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                                                                                               April 28, 2021

The 3.8 % Net Investment Income Tax: Overview, Data, and

Policy Options


Since 2013, certain higher-income individuals have been
subject to a 3.8% unearned income Medicare contribution
tax, more commonly referred to as the net investment
income tax(NIIT). The statutory authority for the taxis
included in Internal Revenue Code Section 1411. The tax
was included as a revenue-raising offset in the Health Care
and Education Reconciliation Act of2010 (HCERA, P.L.
111-152), shortly after the Patient Protection and
Affordable Care Act (P.L. 111-148) was signed into law.
These two laws are commonly referred to as the Affordable
Care Act or ACA.

Policymakers may consider modifications to theNIITto
raise revenue, address income inequality concerns, orboth.
Repealof the NIIT is also a policy option. This In Focus
provides an overview of the tax, presents dataon the
distribution of the tax, and considers severalpolicy options.

Overview of the NIT
The NUT  is equal to 3.8% of the net investment income of
individuals, estates, and certain trusts. Net investment
income includes interest, dividends, annuities, royalties,
certain rents, and certain otherpassive business income not
subject to the corporate tax. Net investment income also
includes the amount ofcapital gain resulting froma home
s ale that exceeds the amount that can be excluded from
taxation ($200,000 for single, $500,000 for married filed
jointly). Net investmentincome does notinclude wages,
unemploymentcompensation,  nonpassive business income,
Social Security Benefits, alimony, tax-exempt interest, and
distributions fromsome tax-preferred retirement accounts;
for example, 401(k)s, 403(b)s, and 457(b)s.

The tax applies to taxpayers with modified adjusted gross
income (MAGI)  in excess of $200,000 if single or head of
household and $250,000 if married filing jointly ($125,000
for married filing separately). The income thresholds are
not adjusted annually for inflation. For taxpayers without
foreign-source income, MAGI generally equals adjusted
gross income (AGI). Hence, MAGIincludes wages,
salaries, tips, and other compensation; dividend and inteirest
income; business and farmincome; realized capitalgains;
retirement distributions; and income froma variety of other
passive activities and certain foreign-earned income.

For those subject to the NIIT, the amount of taxowed is
equalto 3.8% multiplied by the lesser of

  net investmentincome, or

  the amount by which their MAGI exceeds
   $200000/$250000_


Who Pays the NiT?
The Joint Committee on Taxation (JCT) estimates that the
NIIT will raise approximately $27.5 billion of tax revenue
in 2021. According to the most recent data fromthe Internal
Revenue  Service, the majority of the taxis paid by higher-
income households. This reflects the fact that the taxonly
applies to those taxpayers with income (MAGI) above
$200,000 if single or head ofhousehold and $250,000 if
married filing jointly.

Table  1. Distribution of Net Investment Income Tax,
2018

                             Share of
                             Returns      Share of
 Adjusted Gross Income       with Tax     NIIT Paid

 Less than $1OOk               0.1%         0.0%
 $Iookunder$200k                1.7%        0.1%
 $200kunder$500k               68.8%        12.8%
 $500kunder $1 million         19.5%        14.9%
 $1 million under $2 million   6.2%      12.8%
 $2 million under $5 million   2.6%      14.3%
 $5 million under $10 million  0.6%      9.4%
 $10 million or more           0.4%         35.7%
 Total                         100%         100%
 Source: Internal Revenue Service, Statistics of Income, Table 3.3.

 Table 1 shows taxpayers with income of $10 million or
 more paid over a third (35.7%) of the totalNIIT collected in
 2018. These individuals paid $518,845 in NIIT on average
 in 2018. Table 1 also shows that thosemaking between
 $200,000 and $500,000 accounted for the majority of
 taxpayers (68.8%) subject to the 3.8% tax The average
 amount ofNIITpaidby thesetaxpayers was $1,108 in
 2018. Across all taxpayers subjectto the NUT in 2018, the
 average amount oftaxpaid was $5,980.

 Policy Options
 A number of options pertaining to the NUT are available
 depending on theobjective ofpolicymakers. One optionis
 to leave the taxin its current form. The following discusses
possible modifications to the tax.

Eliminate  the Tax
One option wouldbe to eliminate the tax. This change
would reduce thetaxburden on investment, which, to the
extent investment is lower thanit otherwise would be, could


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