• Supreme Court rules 6–3: IEEPA does not authorise the President to impose tariffs.
• Constitutional principle upheld: taxing power belongs exclusively to Congress.
• AGOA renewed, restoring trade predictability for African exporters.

The US Supreme Court has delivered a landmark ruling with far-reaching consequences for international trade, offering renewed hope to African countries whose exports had been severely impacted by unilateral tariffs imposed by President Donald Trump under the International Emergency Economic Powers Act (IEEPA) following his return to the White House.

A Constitutional Reckoning: The Limits of Executive Power

By a 6–3 majority, including conservative justices, the Court ruled that the IEEPA does not grant the President the authority to impose tariffs. At the heart of the decision lies a foundational constitutional principle: the power to levy taxes and duties belongs exclusively to Congress, not the executive branch.

The Trump administration had argued that the IEEPA — a 1977 statute granting broad economic powers to the President during declared national emergencies — authorised sweeping import tariffs. The Court firmly rejected this interpretation, finding that while the law permits the President to "regulate" imports, regulation does not equate to taxation. Because the IEEPA contains no explicit reference to "duties" or "tariffs," it cannot be construed as delegating such sweeping authority to the executive.

The majority further observed that in nearly five decades since the law's enactment, no previous president had used it to impose broad-based tariffs. Accepting the administration's expansive reading, the Court warned, would effectively confer unlimited discretion over trade policy on the executive branch — unconstrained in scope, rate, or duration. Emergency powers, the ruling affirms, cannot override the constitutional balance of power between Congress and the presidency.

For African exporters, the ruling provides meaningful, if partial, relief. The so-called "reciprocal tariffs" — including a 10% baseline duty on imports from numerous countries — are now invalid. These measures had strained supply chains, compressed margins, and introduced significant uncertainty for producers across the continent.

Mixed Signals for Africa: Relief, Resilience, and Remaining Barriers

This decision arrives alongside a second positive development from Washington: the renewal of the African Growth and Opportunity Act (AGOA), which President Trump had previously threatened not to extend. Together, both measures help restore a degree of predictability to US–Africa trade relations — a crucial prerequisite for long-term investment and export planning.

However, the relief is not comprehensive. Tariffs imposed under Section 232 of the Trade Expansion Act of 1962 — grounded in national security justifications — remain fully in force, including duties on steel and aluminium. For South Africa, whose steel sector is already grappling with structural decline, this represents a serious and ongoing challenge. Reduced competitiveness in the US market further constrains the country's prospects for industrial recovery.

The continued application of these tariffs also hampers value-chain development across the continent. In Guinea, a major bauxite producer, ambitions to advance into aluminium processing and downstream steel manufacturing for export to the United States remain constrained by these enduring barriers.

The broader economic impact of the tariffs on African exports has also been uneven. In South Africa, for example, the automotive sector successfully diversified toward European markets, while agricultural producers expanded sales within Africa. Implementation of the tariffs was not uniform — marked by pauses and adjustments — making a comprehensive assessment of their cumulative effects complex.

On the domestic front, the ruling opens the door to significant financial disputes. Hundreds of US companies that paid the now-invalidated duties may seek reimbursement, potentially carrying major fiscal consequences for the federal government. African businesses, by contrast, are unlikely to recover comparable remedies: production disruptions, lost contracts, and deferred investments are not easily reversed through legal mechanisms.

Ultimately, the Supreme Court's ruling sends a powerful institutional signal: US trade policy remains subject to constitutional constraints, and no president may unilaterally reshape tariff structures under the guise of emergency powers. For Africa, the restoration of legal clarity and greater policy stability is not merely a technical benefit — it is essential to supporting investor confidence, export planning, and deeper integration into global value chains.

Idriss Linge