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Con   gressionol Research Service
Inlorming the IegisIative debate since 1914


                                                                                       Updated October 30, 2023

Federal Tax Gap: Size, Contributing Factors, and the Debate

over Reducing It


Nature of the Federal Tax Gap
The federal tax gap is a measure of overall taxpayer
noncompliance in a specified period. The Internal Revenue
Service (IRS) provides two estimates of the federal tax gap:
a gross measure and a net measure. The gross tax gap is the
difference between the total amount of federal individual
and corporate income, employment, and estate and gift
taxes owed in a year and the total amount of those taxes
paid voluntarily on time. The net tax gap is the difference
between all taxes owed and taxes paid after accounting for
late taxpayer payments and taxes collected through IRS
enforcement actions. This estimate does not consider the
deterrent effects of IRS enforcement on taxpayer
noncompliance.
The federal tax gap has three main components: failure to
file, income underreporting, and tax underpayment.

There are several reasons why the federal tax gap may be a
concern for policymakers. The gap represents uncollected
revenue that the federal government could use for many
purposes, including reducing the budget deficit. The gap
imposes costs on compliant taxpayers that are not borne
equally by noncompliant taxpayers (e.g., higher taxes in the
future, cutbacks in beneficial government programs, and
larger interest payments on federal debt to finance budget
deficits). Sustained growth in the tax gap may undermine
public confidence in the fairness and integrity of the federal
tax system, encouraging more noncompliance.

Estimating the Federal Tax Gap
The IRS has been estimating the size and composition of
the tax gap since 1979. Until 1989, the estimates for tax
compliance were based on data obtained through the
Taxpayer Compliance Measurement  Program (TCMP).  The
data came from comprehensive in-person audits by IRS
examination officers of random samples of individual,
corporate, and employment tax returns. Many audited
taxpayers found them burdensome, as they were required to
provide supporting documents for every tax return line
item. The IRS suspended use of the TCMP in 1988.
In 2000, the IRS adopted a different method of collecting
individual tax compliance data known as the National
Research Program (NRP), which is still in use today. To
estimate compliance, the NRP uses a random stratified
sample of about 13,000 taxpayers deemed representative of
the entire filing population to select tax returns for audit.
Random  sampling provides information on both compliant
taxpayers and noncompliant taxpayers who otherwise might
be difficult to identify using the IRS's income detection
tools. To estimate other components of the tax gap (e.g.,


corporate income and employment taxes), the IRS relies on
a variety of data sources and empirical methods.

There are some deficiencies with the IRS's estimation
methods that have raised some questions about the accuracy
of its tax gap estimates. In a March 2023 report, the
Treasury Inspector General for Tax Administration found
that the IRS does not include estimates of all sources of
taxpayer noncompliance in its tax gap estimates. For
instance, in estimating income underreporting, the IRS
excludes excise taxes; estate and trust taxes; unrelated
business income taxes; some employment taxes; subchapter
S corporate income; and individual income taxes for U.S.
taxpayers with foreign addresses. It is unclear how much
larger the income underreporting estimate would be if those
sources were included.

Size  of  the  Tax  Gap
The most recent tax gap estimate by the IRS covers tax
years 2020 and 2021. According to the report, the average
gross gap in that period was a projected $688 billion, which
yielded a taxpayer net compliance rate of 86.2% for all
federal taxes owed. Late payments and IRS enforcement
actions resulted in a projected average net gap of $582
billion.
As Table 1 shows, between 2001 and 2021, the net federal
tax gap (2021 dollars) reached its lowest level in 2001
($444 billion) and its highest level in 2021 ($582 billion),
with some ups and downs in between. The net taxpayer
noncompliance rate was the same in 2001 and 2021, with
the highest rate in 2008-2010 and the lowest rate in 2014-
2016.

Table  1. Net Federal Tax Gap Estimates from  2001 to
2021

             Billions of  Billions of  Net Taxpayer
             Current        2021      Noncompliance
 Year(s)      Dollars      Dollars       Ratea (%)


2001
2006
2008-
2010
2011 -
2013
2014-
2016
2017-
2019


$290
$385

$406


$380


$428


$481


$444
$516

$508


$450


$486


13.7%
14.5%

16.3%


14.2%


13.0%


$514           13.2%

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