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                                                                                                  February 3, 2025

Selected Issues in Tax Reform: The Deduction for State and

Local Taxes


Members  of Congress are currently debating legislative
options related to the deduction for state and local taxes
paid (or SALT deduction), which is among the largest tax
expenditures in the federal income tax system. P.L. 115-97
(often referred to as the Tax Cuts and Jobs Act, TCJA) both
directly and indirectly changed the SALT deduction, most
notably by limiting the amount of nonbusiness taxes that
can be claimed under the deduction (the SALT cap) and
roughly doubling the standard deduction. Those changes are
scheduled to expire after the 2025 tax year. This In Focus
summarizes  the deduction and briefly examines policy
issues that may be relevant to SALT reform. For more
extensive analysis of the SALT deduction, see CRS Report
RL32781,  Federal Deductibility of State and Local Taxes.

Summary and Le             atve Back round
All individual taxpayers who itemize their deductions
(rather than claiming the standard deduction) may claim a
SALT  deduction when filing a federal tax return. Business
taxpayers, in contrast, may deduct state and local taxes as a
cost of doing business. Qualifying taxpayers may claim
deductions for state and local real estate taxes, personal
property taxes, and either income taxes or sales taxes when
calculating taxable federal income. As with all deductions,
the savings to individual taxpayers equals the taxpayer's
marginal tax rate multiplied by the amount of the deduction.

The SALT  deduction was established by the Revenue Act
of 1913 and subsequently modified on many occasions.
Changes in the decades prior to enactment of the TCJA
include repeal of the deduction for sales taxes by the Tax
Reform  Act of 1986 (P.L. 99-514), temporary instatement
of a deduction for sales taxes in lieu of income taxes by the
American  Jobs Creation Act of 2004 (AJCA 2004, P.L.
108-357), and permanent incorporation of the sales taxes
deduction in lieu of income taxes by the Consolidated
Appropriations Act, 2016 (P.L. 114-113).

The TCJA  reformed both the SALT deduction and other tax
deductions in ways that affected SALT uptake. These
changes included (1) limiting SALT deduction claims to
$10,000 (or $5,000 for married taxpayers filing separately)
for any taxes not paid in the carrying on of a trade or
business; (2) prohibiting claims for foreign real property
taxes; (3) roughly doubling the value of the standard
deduction; and (4) reducing the value of other itemized
deductions. All of those changes are effective for tax years
2018 through 2025, reverting to prior law in tax year 2026.

The changes in the TCJA reduced both the share of
taxpayers claiming a SALT deduction and the average
amount deducted, as seen in Table 1. In tax year 2022, 9%
of tax returns claimed a SALT deduction, less than one-


third of the comparable total in 2017 (31%), the last year
before the TCJA changes took effect. The average SALT
deduction decreased by a little more than $5,000 over those
years.

Table  I. SALT Deduction   Claims and Value  by Year

                      % of Returns
     Tax Year       with Deduction     Average Claim

       2017               31%              $13,400
       2022               9%               $8,100
Source: Internal Revenue Service, CRS calculations.
Note: Claim amounts rounded to nearest hundred.

The TCJA's  effects on SALT deduction activity were
dampened  in many states by a so-called pass-through
workaround  that was deemed permissible by a 2020
regulation from the Internal Revenue Service. As the SALT
cap does not apply to taxes paid in the carrying on of a
trade or business, taxpayers whose state and local tax
payments are associated with pass-through business income
(including income from S corporations and partnerships)
may  not be subject to the SALT cap in the same manner as
other taxpayers.

Certain state governments have adjusted for this activity by
enacting laws that levy or raise state taxes on the pass-
through business entity itself that are exactly offset (holding
total tax rates constant) by federal tax reductions or tax
credits applied to individual income liability for pass-
through business members subject to the tax increase,
thereby taxing business activity and excluding such income
from the $10,000 limitation for affected individual owners.

More  generally, the SALT deduction allows state and local
governments to levy higher taxes, as the federal
government  effectively offsets part of taxpayers' higher
state and local tax burdens. By limiting the deduction, the
SALT  cap increases the net cost of state and local taxes for
affected taxpayers. Without a SALT cap, for example, a
taxpayer with $30,000 of eligible state and local tax
payments and a 37%  marginal tax rate could have reduced
their tax liability by $11,100 ($30,000 x 0.37) through the
SALT  deduction. In 2025, that same activity would reduce
tax liability by $3,700 if subject to a $10,000 SALT cap
($10,000 x 0.37).

All else equal, the SALT deduction is more valuable in
states with higher taxes. Taxpayers in high-tax states were
more likely than those in low-tax states to claim a SALT
deduction both before and after the TCJA took effect, as


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