The Legal Basis for IEEPA Tariff Challenges: What Importers Need to Know

The core legal question

At the heart of every IEEPA tariff challenge is a straightforward question: Does the International Emergency Economic Powers Act authorize the President to impose tariffs?

A growing body of legal analysis — and early court rulings — suggest the answer is no. Here's why.

Argument 1: Statutory text — IEEPA does not mention tariffs

IEEPA grants the President authority to "investigate, block during the pendency of an investigation, regulate, direct and compel, nullify, void, prevent, or prohibit" certain transactions and property transfers during a declared national emergency.

Notably absent from this list: the power to impose tariffs or customs duties. Legal challengers argue that tariffs are a fundamentally different type of economic action — a revenue-raising measure — that falls outside the scope of IEEPA's delegation. Congress has separate statutes (Section 301, Section 232, the Tariff Act) that specifically authorize tariff actions, each with their own procedural requirements.

Argument 2: Legislative history

IEEPA was enacted in 1977 as a reform of the Trading with the Enemy Act (TWEA), which had been criticized for giving the President overly broad economic powers. Congress specifically narrowed presidential authority when drafting IEEPA.

The legislative history shows that Congress intended IEEPA for financial sanctions: freezing assets, blocking transactions, and restricting economic dealings with designated entities. There is no indication in the committee reports, floor debates, or conference materials that tariff authority was contemplated.

Argument 3: Non-delegation and separation of powers

The U.S. Constitution vests the power to "lay and collect Taxes, Duties, Imposts, and Excises" in Congress (Article I, Section 8). While Congress can delegate tariff authority to the President, it must do so with clear standards and guidelines.

Challengers argue that reading IEEPA as a tariff-authorization statute would violate the non-delegation doctrine — it would amount to a blank check for the President to impose any level of duties on any country, with no procedural guardrails, simply by declaring an emergency. Courts have signaled increasing skepticism of such broad delegations.

Argument 4: Major-questions doctrine

The Supreme Court's recent major-questions doctrine (articulated in West Virginia v. EPA and related cases) holds that agencies — and by extension, the executive branch — cannot claim authority over questions of vast economic and political significance unless Congress has clearly granted that power.

IEEPA tariffs affect hundreds of billions of dollars in trade and reshape the entire U.S. import landscape. Courts applying the major-questions doctrine may conclude that such a sweeping economic action requires explicit congressional authorization rather than an implied reading of a sanctions statute.

Where do the cases stand?

As of mid-2025, several significant developments have occurred:

• The Court of International Trade (CIT) has accepted multiple challenges and issued preliminary orders questioning IEEPA tariff authority.
• The Federal Circuit is expected to take up appeals on an expedited basis.
• At least one federal district court outside the CIT has issued a preliminary injunction on constitutional grounds.
• The Department of Justice has defended the tariffs but has faced tough questioning from judges at oral arguments.

While no final judgment has been entered, the trajectory of the litigation is favorable for importers.

What this means for claim values

Every favorable ruling increases the expected recovery value of IEEPA tariff claims. Institutional buyers price claims based on the probability of a successful outcome, so stronger legal precedent translates directly to higher purchase prices for importers.

However, once cases are fully resolved, the uncertainty premium disappears. Importers who sell their claims while litigation is still active benefit from the buyers' need to price in risk — and pay a premium for the opportunity to be positioned for the eventual outcome.

Should importers wait or sell now?

This is ultimately a business decision. Importers who are confident in the legal outcome and have the resources to wait may prefer to pursue claims directly. Those who want certainty, immediate cash flow, and freedom from legal complexity may prefer to sell.

The important thing is to act before deadlines pass. CBP protest deadlines, statute-of-limitations periods, and legal filing windows are time-sensitive. Whether you plan to sell or litigate, consult with a trade attorney to ensure your rights are preserved.