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U.S. Tariff Policy: Overview


Updated January 31, 2025


Introduct on
A tariff is a tax levied on imported goods and services.
Historically, tariffs were a major source of revenue for
many  countries and were often the primary source of
federal revenue through the late-nineteenth century. Today,
other taxes account for most government revenue in
developed countries. Tariffs are now typically used
selectively to protect certain domestic industries, advance
foreign policy goals, or as negotiating leverage in trade
negotiations.
The U.S. Constitution empowers Congress to set import
tariffs, a power that Congress has partially delegated to the
President. The United States is also a member of the World
Trade Organization (WTO)  and a party to a number of trade
agreements, which include specific tariff-related
commitments.  Congress and the President thus create U.S.
tariff policy within the context of a rules-based global
trading system.

rues-Based          oba    Trading System
The rules-based global trading system was established
following World War  II. It began as the General Agreement
on Tariffs and Trade (GATT), which was later integrated
into a larger set of agreements establishing the WTO. This
system aimed to reduce trade barriers and prevent trade
wars by establishing rules for the use of tariffs. Among this
system's core rules with regard to tariffs are
*  Nondiscrimination.  Under the most-favored nation
   (MFN)  rule, a country must extend any trade
   concession, such as a reduced tariff rate, granted to one
   member  to all other WTO members.  There are
   exceptions, such as preferential rates for Free Trade
   Agreements  (FTAs), special treatment for developing
   countries, and remedies for addressing certain unfair
   trading practices.
*  Binding  Commitments.   Through multilateral
   negotiations, countries bind themselves to ceilings on
   tariff rates for specific imports. That ceiling is called the
   bound  rate, which can be higher than actual applied
   rates.
*  Transparency.  The WTO   requires members to publish
   and report their tariff rates.
*  Safety Valves. The WTO   agreements permit members
   to raise tariffs to address unfair trade practices and to
   allow domestic industries to adjust to sudden surges in
   imports in some circumstances.

Following the establishment of the GATT in 1947 and the
WTO   in 1995, global tariff rates declined, spurring trade
and opening markets for U.S. exports (Figure 1). Since the
establishment of the WTO, the value of exports of U.S.
goods have increased more than 160% adjusted for
inflation.


Figure I. Weighted  Average   Applied Tariff Rates


Source: World Bank.
Notes: Weighted average of applied tariff rates (expressed as
percentages) globally and among the five largest economies by GDP.
Gaps indicate missing data. 2021 is the most recent year with fully
comparable data.

U.S.   Tarff   PoLcy

Who   Makes   U.S. Tariff Policy?
The Constitution grants Congress the power to lay and
collect duties and to regulate commerce with foreign
nations. Because tariffs are no longer a major element of
domestic tax policy, they have instead become an
instrument of U.S. foreign policy and trade promotion. As
such, Congress often works with the President to set tariff
policy by authorizing the President to negotiate trade
agreements and to adjust tariffs in certain circumstances.
Presidential Trade Promotion  Authority  (TPA). Prior to
the 1930s, Congress usually set tariff rates legislatively. As
U.S. and global tariff rates increased during the Great
Depression, U.S. exports decreased. Congress responded by
authorizing the President to negotiate reciprocal trade
agreements and proclaim tariff reductions up to a pre-set
boundary. Hence, such agreements could enter into force
without further congressional action. However, by the late
1960s, nontariff barriers to trade (such as discriminatory
technical standards) became a greater focus of trade
negotiations. As a result, it became difficult to predict the
substance of the negotiations and authorize changes to
existing U.S. laws by proclamation before the negotiations
took place. Congress addressed this challenge in 1974 by
establishing expedited procedures to enact implementing
legislation for trade agreements addressing nontariff
barriers. Under these procedures, currently known as Trade
Promotion Authority (TPA), Congress establishes U.S.
trade negotiating objectives as well as consultation and
notification requirements. If the President satisfies these
objectives and requirements, implementing legislation for
an agreement may  receive expedited treatment including an
up or down vote without amendment. The  most recent

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