The U.S. Tariff Legal Toolkit — Six Instruments After IEEPA

The U.S. legal system gives the president multiple statutory instruments for imposing tariffs. After the Supreme Court ruled IEEPA illegal, the Trump administration will lean primarily on the alternatives below. This essay systematically maps six tariff legal instruments, laying out in full their respective scopes of application, rate ceilings, procedural requirements, and historical use.

Overview of the Instruments

Legal Instrument	Type	Rate Ceiling	Time Limit	Investigation Required	Historical Use
IEEPA	Country-specific / global	None	None	None	Trump's second term only
Section 122	Uniform global	15%	150 days	None	Never (Nixon used a similar measure in 1971)
Section 301	Country-specific	None	4 years, renewable	USTR investigation	Core of the China tariffs
Section 232	Sectoral	None	None	Commerce Department investigation	Steel & aluminum / autos / copper, etc.
Section 201	Sectoral	50%	4 years, extendable to 8	ITC investigation	Solar panels / washing machines
Section 338	Country-specific	50%	None	None	Never

IEEPA — The Core Bludgeon, Now Inert

The International Emergency Economic Powers Act (IEEPA) was once the single most central weapon in Trump's tariff arsenal. Its greatest advantage was flexibility: the president could act the moment he posted on social media, with no investigation and no congressional approval. There was no ceiling on rates and no limit on duration.

But it was also a blade too sharp. On February 20, 2026, the U.S. Supreme Court ruled 6–3 that Trump's across-the-board tariffs imposed under IEEPA were unlawful — a decision that effectively sealed the instrument away, so far as trade is concerned.

IEEPA's invalidation created a legal vacuum. Since then, the Trump administration has had to reach for Section 122 as a temporary expedient — but the 150-day window is already counting down.

Section 122 — The Emergency Stopgap

Section 122 of the Trade Act of 1974 is an obscure provision of the U.S. code. It authorizes the president, in response to a serious balance-of-payments disequilibrium, to impose temporary tariffs of up to 15% for a period of 150 days.

Section 122 has three fatal flaws:

• A 15% rate ceiling — far below the tariff levels Trump actually requires
• It cannot target specific countries — it applies uniformly to all countries, making a differentiated tariff strategy impossible
• The 150-day countdown — a replacement must be found before July 24, 2026

Trump has already invoked Section 122, but by design it was never capable of underpinning the geopolitical ambitions of his "tiered tariffs."

Section 301 — The Future Core Country-Specific Tool

Section 301 of the Trade Act of 1974 is the core weapon authorizing the president to sanction foreign "unfair trade practices," and it was the statutory basis for Trump's first-term tariffs on China. Its key features:

• No ceiling on rates; can target specific countries
• Broad scope of application — subsidies, piracy, discriminatory regulation, and more can all trigger it
• It cannot take effect instantly — it requires the Office of the U.S. Trade Representative (USTR) to open an investigation and issue a determination

That procedural requirement is the crucial gap between it and IEEPA. Going forward, the Trump administration will press Section 301 to the maximum: expanding the list of investigations, accelerating determination cycles, and raising rate levels. But it will never be able to act on the strength of a single tweet the way IEEPA could.

Section 232 — The Most Important Sectoral Tool

Section 232 of the Trade Expansion Act of 1962 authorizes the president to impose tariffs on grounds of "national security." Its core advantage is that the definition of "national security" is extraordinarily broad, leaving the White House immense room for interpretation.

• No ceiling on rates, no statutory time limit
• Requires the Commerce Department to open an investigation and issue a "national security impact assessment"
• Already used on steel and aluminum (25%), autos, copper, lumber, and other sectors
• A supporting role — it cannot replace IEEPA's country-specific function

Section 232 is the core instrument of Trump's "sectoral tariff" track, but it can only cover categories of goods; it cannot, the way a country-specific tariff can, impose differentiated rates on particular countries.

Section 201 — Safeguard Tariffs

Section 201 of the Trade Act of 1974 is the traditional "safeguard" provision. When the ITC (International Trade Commission) determines that a surge in imports is causing serious injury to a domestic industry, the president may impose tariffs.

• Rate ceiling of 50%, maximum duration of eight years
• Cumbersome procedure: a full ITC investigation, public hearings, and an injury determination are all required
• Narrow coverage — only one product or sector at a time
• Already used on solar panels and washing machines — with limited effect

Section 201's procedural threshold demotes it to a marginal option — wholly unsuited to any scenario that calls for swift, broad-based tariff increases.

Section 338 — Existence in Theory Only

Section 338 of the Tariff Act of 1930 (the Smoot-Hawley Tariff Act) authorizes the president to impose tariffs of up to 50% on countries that "discriminate against American commerce." No investigation is required — a presidential determination alone suffices.

But no president has ever formally invoked this statute. Any use would immediately invite fierce legal challenge — indeed, its existence says more about how dated and cluttered U.S. tariff law is than it offers a workable option.

Trump's Intent: A Tiered Tariff System

The key to understanding these instruments lies in the defining feature of Trump's tariffs: differentiation. Different rates for different countries and regions, deployed to establish a pecking order of geopolitical closeness and distance.

IEEPA fit that objective perfectly — instant effect, no ceiling, discriminatory by design. Its invalidation has forced the Trump administration to settle for less:

• Country-specific tariffs = Section 301 (the core substitute), but immediacy is lost
• Sectoral tariffs = Section 232 (the supplement), with limited coverage
• Everything else = Section 122 (the stopgap), Section 201 (the marginal option), Section 338 (the theoretical one)

Conclusion: not a single alternative can fully replicate what IEEPA did.

The Full Landscape of Legal Risk

Compared with IEEPA, every alternative raises the risk of judicial challenge:

• Section 301 requires proof of "unfair practices" — a logic that is easy for the international community to question
• Once Section 232's "national security" rationale has been abused, the tolerance of judicial review is thrown into doubt
• Section 122 has never been used in this way; its applicability is murky
• Section 338 has no historical precedent
• The ruling that IEEPA was illegal lays a case-law foundation for subsequent challenges