US Supreme Court Strikes Down Tariffs: A Watershed Moment for Canadian Trade Law Rebates

By Alaric J. Sterling-Vance

For Canadian trade counsel, the "what if" scenario just became a "what now" reality. The U.S. Supreme Court’s decision this morning to strike down the executive branch’s sweeping global tariffs does not just signal a shift in U.S. constitutional law—it triggers one of the most significant cross-border capital recovery opportunities in a generation.

With over $133 billion in duties collected under the now-invalidated framework, the door is open for Canadian exporters to reclaim lost revenue. However, as the dissenting justices noted, the path to these refunds involves navigating a complex administrative landscape following this historic rebuke of executive authority.

The Ruling: A Constitutional Check on Emergency Powers

In a decisive 6-3 decision delivered on February 20, 2026, the Supreme Court ruled that the International Emergency Economic Powers Act (IEEPA) of 1977 does not grant the President the authority to impose tariffs. The ruling addresses a series of lawsuits brought by a coalition of challengers, including a dozen largely Democratic-leaning states and small businesses selling goods ranging from plumbing supplies to educational toys to women's cycling apparel.

The Court’s majority opinion dismantled the administration's argument that the power to "regulate importation" during national emergencies included the power to levy taxes. The decision affirms the constitutional principle that the power to levy tariffs resides with Congress, not the Executive Branch. This invalidates the "reciprocal" tariffs levied on Canada, Mexico, and China—measures the administration had justified by declaring trade deficits and drug trafficking as national emergencies.

The Dissent and the Road Ahead

Justices Samuel Alito, Clarence Thomas, and Brett Kavanaugh dissented from the majority opinion. The dissent highlights the deep judicial divide regarding the scope of executive power in economic regulation. For practitioners, the immediate takeaway is that while the legal foundation for the tariffs has been struck down, the administrative machinery for returning the funds is not automatically triggered.

The "So What": Implications for Canadian Counsel

For Canadian exporters who have paid sweeping duties on goods, this ruling is a victory in principle but a challenge in practice. The invalidation of the tariffs means the legal basis for holding these funds has evaporated, but the U.S. Customs and Border Protection (CBP) faces a logistical hurdle in returning them on this scale.

We are moving from a phase of Canada-US trade compliance to one of aggressive cross-border litigation and administrative recovery. The scale of the financial impact is staggering; the Congressional Budget Office had estimated the economic impact of these tariffs at some $3 trillion over the next decade.

Major U.S. importers like Costco have already lined up in court to demand refunds. Canadian companies that sit on the sidelines waiting for a check in the mail will likely find themselves at the back of a very long, very bureaucratic queue. The Department of Commerce and CBP will likely face a deluge of refund requests that could paralyze standard processing times.

The "Now What": A Strategic Action Plan

To secure Customs and Border Protection refunds for your clients, immediate action is required. The presumption of refund availability does not equal the guarantee of payment.

1. Immediate Preservation of Import Records

Ensure clients segregate and preserve all entry summaries (CBP Form 7501) and commercial invoices for the affected period (April 2025 to present). You must be able to trace every dollar of duty paid specifically under the IEEPA authority codes. Documentation must be precise, linking specific entries to the invalidated executive orders.

2. Assess Liquidation Status

Determine which entries are "liquidated" (finalized) and which are unliquidated.

• Unliquidated Entries: These are the easiest to recover. Counsel should immediately file post-summary corrections or protests to assert the Supreme Court’s ruling.
• Liquidated Entries: These pose a harder challenge. You may need to file suit in the U.S. Court of International Trade (CIT) to reopen these entries based on the constitutional invalidity of the underlying order.

3. File Protective Protests

Do not wait for CBP to issue guidance. File protective protests for all subject entries to toll the statute of limitations. The argument is simple: The collection of duties was ultra vires ab initio based on the Supreme Court's interpretation of the IEEPA.

4. Monitor "Replacement" Actions

Be aware that while the IEEPA tariffs are dead, the administration may attempt to pivot to other statutes. Top administration officials have already indicated they expect to keep the tariff framework in place under other authorities. Advise clients that while retrospective relief is likely, prospective volatility remains high.

Navigating the Recovery

The Supreme Court has removed the burden, but it has not written the check. The onus is now on counsel to force the administrative machinery of the U.S. government to comply with the judicial mandate. With $133 billion in collected taxes at stake, the government will likely scrutinize every refund claim for procedural defects.

We will be covering the specific procedural filings and litigation strategies for this recovery process in our upcoming CPD webinar, "Cross-Border Recovery: Navigating Post-Tariff Rebates and Trade Strategy for Canadian Counsel." We will provide draft templates for protest filings and a decision matrix for litigating liquidated entries.