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Congressional Research Service
Informing th~ IegislThve debate since 1914


November  19, 2024


Selected Issues in Tax Policy: The Child Tax Credit


Tax reform proposals in the 119th Congress may include
reforms to the child tax credit, which increases the after-tax
incomes of some households with children. The child tax
credit was substantively modified by P.L. 115-97 (often
referred to as the Tax Cuts and Jobs Act, TCJA), and those
changes are scheduled to expire after the 2025 tax year.
This In Focus summarizes the child tax credit and briefly
examines some key policy issues that may be relevant to
proposals for its reform.

Sumr     ary  and   Legislatve Background

201 7 Parameters
Prior to enactment of the TCJA, the child tax credit let
taxpayers reduce their tax liabilities by up to $1,000 per
child. The credit was refundable, meaning those with no
income tax liability could receive the credit as a refund. The
credit phased in with earned income: it was worth 15% of a
taxpayer's earned income above $3,000, up to the
maximum   credit amount. Taxpayers with no earned income
could not claim the credit, and those with low earned
income could claim a partial credit. The credit's value also
phased out with a taxpayer's modified adjusted gross
income (MAGI).  Taxpayers had to reduce the value of their
credit by 5% of their MAGI above certain thresholds:
$110,000 if the taxpayer was married filing jointly and
$75,000 otherwise. (For example, a single taxpayer earning
$85,000 would have the credit reduced by 5% of $10,000,
or $500.)

Filers had to include a taxpayer identification number (TIN)
for themselves and the child for whom they claimed the
credit. Qualifying TINs could include a work-authorized
Social Security Number (SSN) or an Immigrant Taxpayer
Identification Number (ITIN) issued by the IRS. Qualifying
children generally must have been under 18 and have lived
with the taxpayer for at least half the year.

Current  Polcy  (TCJA)  Parameters   and  Temporary
2021  Changes
The TCJA  temporarily changed the credit's parameters
through the end of 2025. The law raised the maximum
value of the child tax credit to $2,000 per child. It also
limited the amount that a taxpayer could receive as a tax
refund if a taxpayer lacked income tax liability against
which to apply the credit. That amount was initially set at
$1,400 and indexed to inflation (and equal to $1,700 in
2024 and 2025). The refundable portion of the credit is
known  as the additional child tax credit, or ACTC. The
TCJA  also lowered the earned income threshold at which
the credit began phasing in from $3,000 to $2,500. The
threshold at which the credit began phasing out rose to
$400,000 for those married filing jointly and $200,000 for
others. The law also required that filers provide a work-


authorized SSN (i.e., not an ITIN) for the child for whom
the credit is claimed.

These changes may offset another provision of the TCJA,
the temporary elimination of personal exemptions for
dependents. Because not all dependents qualify for the child
tax credit, the TCJA also created a $500 nonrefundable
credit for other dependents.

Congress further expanded the child tax credit for tax year
2021. The credit was made fully refundable with no phase-
in; families with no income could receive the full credit.
The maximum   credit was raised to $3,000 per child over
the age of 5 and $3,600 for each child age 5 and younger.
The additional credit, above TCJA levels, phased out for
those with incomes above certain thresholds: $150,000 for
married joint filers, $112,500 for head of household filers,
and $75,000 for single filers. Additionally, policymakers
made  half the credit advanceable, meaning taxpayers
received it in monthly installments rather than solely upon
filing their tax returns. The Joint Committee on Taxation
(JCT) and the Congressional Budget Office (CBO)
estimated that making these changes permanent would have
raised deficits by roughly $1.6 trillion from FY2022 to
FY2031,  excluding the cost of debt financing.

Parameters   Start ng in 2026
Congress scheduled the TCJA's changes to the child tax
credit to expire at the end of 2025. In 2026, the credit will
revert to its 2017 parameters absent congressional action.
The maximum   credit will be $1,000 per child, the
preexisting phase-in and phaseout thresholds will return,
and taxpayers whose children lack work-authorized SSNs
will once again qualify. Taxpayers will no longer have the
option of claiming the nonrefundable credit for other
dependents, but will be able to claim personal exemptions
for their dependents, including children.

The JCT estimates that extending the TCJA's changes to
the child tax credit and credit for other dependents would
increase deficits by $748 billion through 2035, excluding
the cost of debt financing. Extending the work-authorized
SSN  requirement would offset $12 billion (2%) of that cost.

Pol  cy  Cons   derat   ons  and   Proposals for
Re   orm

Po  cy  ssues and Cons  derations
The child tax credit presents a number of issues lawmakers
could consider when deciding whether to let the expiration
occur in 2026, extend the TCJA's policies, or alter them.

Because the child tax credit phases in with earned income,
it potentially affects whether filers earn income. The credit

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