After the Supreme Court Struck Down IEEPA Tariffs: The New Trade Policy Landscape

What did the Supreme Court rule about IEEPA tariffs?

On February 20, 2026, the Supreme Court ruled 6-3 in Learning Resources, Inc. v. Trump that the International Emergency Economic Powers Act does not authorize the President to impose tariffs. The decision invalidated all IEEPA-based duties, which had generated over $200 billion in revenue and applied to imports from virtually every trading partner, including the "reciprocal" tariffs on most countries and "fentanyl" tariffs targeting China, Canada, and Mexico.

What replaced the IEEPA tariffs?

Within hours of the ruling, President Trump signed an executive order imposing a 10% global tariff under Section 122 of the Trade Act of 1974, a temporary measure limited to 150 days and a maximum rate of 15%. Simultaneously, the administration launched Section 301 investigations targeting 16 economies for excess manufacturing capacity and 60 economies for inadequate forced labor enforcement, expected to provide the legal basis for longer-term tariffs.

The Supreme Court's IEEPA decision is the most consequential trade law ruling in decades. It removed the legal foundation for the administration's most sweeping tariff actions, triggered an estimated $166 billion in refunds to 330,000+ importers, and forced a rapid pivot to alternative tariff authorities. The ruling did not end the tariff era. Instead, it accelerated the diversification of tariff tools and created a period of legal and policy uncertainty that importers will navigate for the rest of 2026 and beyond.

Last updated: March 2026

What Was the Court's Reasoning?

Chief Justice Roberts, writing for the 6-3 majority, concluded that IEEPA's text authorizes the President to "regulate" international transactions during a declared national emergency, but that tariffs are a form of taxation, not regulation, and therefore fall outside IEEPA's scope. The majority drew a distinction between regulatory powers (blocking transactions, freezing assets) and revenue-raising powers (imposing duties on imported goods), concluding that the Constitution assigns the power to lay and collect duties to Congress.

Justice Kavanaugh, in dissent, argued that the ruling might not substantially constrain presidential tariff authority because other federal statutes authorize tariff actions, albeit with additional procedural steps. Roberts addressed this briefly, suggesting the bar to imposing tariffs under other laws may be higher than the dissent depicted.

The administration has petitioned for rehearing, but the Supreme Court has not granted rehearing in an argued case since 1965, making the odds extremely long.

How Has the Tariff Landscape Shifted Since the Ruling?

Date	Development
Feb. 20, 2026	Supreme Court strikes down IEEPA tariffs (6-3)
Feb. 20, 2026	President signs Section 122 executive order (10% global tariff)
Feb. 24, 2026	Section 122 tariffs take effect
Mar. 4, 2026	Court of International Trade orders CBP to begin IEEPA refunds
Mar. 6, 2026	CIT suspends immediate refund order pending CAPE development
Mar. 11, 2026	USTR initiates Section 301 excess capacity investigations (16 economies)
Mar. 12, 2026	USTR initiates Section 301 forced labor investigations (60 economies)
Mar. 19, 2026	CBP reports CAPE refund system 45-80% complete

The effective tariff rate dropped from approximately 14.3% (the highest since 1939 during the IEEPA period) to 10.5% under the current regime, still the highest since 1943. If Section 122 expires without replacement, the rate would fall further to approximately 7.3%.

What Legal Authorities Remain Available for Tariffs?

The IEEPA ruling narrowed one tool but left several others intact:

Section 122 (Trade Act of 1974). Currently in use. Temporary tariffs up to 15%, maximum 150 days. Expiring July 24, 2026. Under legal challenge by state attorneys general.

Section 301 (Trade Act of 1974). Being activated through new investigations. No statutory cap on rate or duration. Has survived prior court challenges. Existing China Section 301 tariffs remain in effect.

Section 232 (Trade Expansion Act of 1962). Remains in effect for steel (25-50%), aluminum (25%), automobiles and auto parts (25%), with copper, lumber, and semiconductors also covered.

Antidumping and Countervailing Duties. Product- and country-specific. Unaffected by the IEEPA ruling.

Penn Wharton Budget Model data shows that effective tariff rates vary dramatically by partner: China faces 33.9%, while Canada and Mexico face less than 5% due to high USMCA utilization.

What Should Importers Expect for the Rest of 2026?

April-May 2026: Section 301 hearings provide signals about which countries and sectors will face new tariffs. CAPE system approaches go-live for IEEPA refund processing.

July 24, 2026: Section 122 tariffs expire. If Section 301 tariffs are ready, country-specific rates replace the uniform 10%. If not, the effective tariff rate drops to approximately 7.3%.

Second half 2026: Section 301 tariff implementation begins. Court challenges to Section 122 may produce additional rulings. IEEPA refunds continue processing.

GingerControl is a trade compliance AI platform that helps importers, exporters, and customs brokers classify products, simulate tariff costs, and track policy changes. For importers navigating this transitional period, GingerControl's Tariff Calculator models the full current tariff stack with date-sensitive calculations, and the Tariff Briefing delivers daily policy updates.

FAQ

Did the Supreme Court ruling eliminate all tariffs?

No. Only IEEPA tariffs were invalidated. Section 232 tariffs (steel, aluminum, autos), existing Section 301 tariffs (China), antidumping/countervailing duties, and base MFN tariffs all remain. Section 122 tariffs were imposed within hours of the ruling.

Can the administration reimpose the same tariff rates under different legal authority?

Potentially, but with constraints. Section 301 can authorize country-specific tariffs without rate caps but requires an investigation process. Section 122 is temporary and capped at 15%. The practical result may be similar rates on many products, but the legal pathway requires more procedural steps.

Is the Supreme Court likely to reconsider its IEEPA ruling?

Extremely unlikely. The Court has not granted rehearing in an argued case since 1965 and has not reversed its original ruling on rehearing since 1956.

Will importers automatically receive IEEPA refunds?

No. CBP is building the CAPE system for importers to submit refund claims through the ACE portal. Claims must be filed with entry-level data. Refunds will not be issued automatically.

How can GingerControl help during this transition?

GingerControl's Tariff Calculator models the current stack (Section 122 + Section 301 + Section 232), the Tariff Briefing delivers daily policy updates, and the HTS Classifier provides audit-ready classification research. Try GingerControl

The post-IEEPA tariff landscape demands tools that keep pace with rapid policy changes. GingerControl's Tariff Calculator models every active tariff layer with date-sensitive precision.

GingerControl is not just a tool. We work with importers and trade compliance teams on process consulting, digital transformation strategy, and end-to-end custom system development. Talk to our team

References

[REF 1] SCOTUSblog, "The remaining questions after the Supreme Court's tariffs ruling" Data cited: Rehearing statistics, Kavanaugh dissent, Section 122 challenge Source: SCOTUSblog Published: March 17, 2026

[REF 2] Yale Budget Lab, "State of Tariffs: March 9, 2026" Data cited: 14.3% pre-ruling ETR, 10.5% current ETR, 7.3% post-Section 122 projection Source: Yale Budget Lab Published: March 9, 2026

[REF 3] Penn Wharton Budget Model, "Effective Tariff Rates and Revenues" Data cited: China 33.9% ETR, Canada/Mexico below 5%, $209 billion revenue Source: Penn Wharton Published: March 16, 2026

[REF 4] Grassi Advisors, "U.S. Customs Outlines Four-Step Tariff Refund Process" Data cited: $166 billion total, 330,000 importers Source: Grassi Published: March 16, 2026

[REF 5] Tax Foundation, "Tariff Tracker" Data cited: IEEPA timeline, Section 122 implementation, surviving programs Source: Tax Foundation Published: March 2026