Executive Summary: Key Legal and Evidentiary Issues

• Dispute centered on whether Canada’s Minister of National Revenue could compel Shopify to disclose user information under a tax treaty with Australia.

• The Minister relied on the Convention on Mutual Administrative Assistance in Tax Matters to justify a court-authorized Unnamed Persons Requirement (UPR).

• Shopify challenged the Minister’s authority, arguing the Convention had not been incorporated into Canadian domestic law for UPRs.

• The Court emphasized Canada’s dualist system, requiring explicit legislative incorporation of treaties for domestic enforceability.

• The judge held that subsection 231.2(3) of the Income Tax Act does not include listed international agreements like the Convention.

• Application for judicial authorization of the UPR was dismissed, with $5,000 awarded to Shopify in costs.

Facts and outcome of the case

Background and factual context
The case involves a dispute between the Minister of National Revenue (representing the Canada Revenue Agency, CRA) and Shopify Inc., a Canadian-based e-commerce platform. The Australian Taxation Office (ATO) requested information from Canada under a multilateral treaty—the Convention on Mutual Administrative Assistance in Tax Matters. The ATO suspected that some Shopify merchants conducting business with Australian consumers might be underreporting Goods and Services Tax (GST) obligations.

To respond to this request, the CRA sought a judicial authorization under subsection 231.2(3) of the Income Tax Act (ITA) to compel Shopify to provide detailed information about an “ascertainable” group of unnamed merchants who had customers with Australian billing addresses. This legal mechanism is known as an Unnamed Persons Requirement (UPR), and it requires court approval unlike "named persons" information requests.

Legal arguments
The Minister argued that the Convention imposed a duty on Canada to cooperate with the ATO and that subsection 231.2(3) of the ITA should be interpreted in harmony with that obligation—even though it does not explicitly reference international agreements. The Minister claimed that the CRA had the statutory authority to issue the UPR and that all conditions under the law were met.

Shopify opposed the application, asserting that the Convention was never incorporated into Canadian domestic law in the context of UPRs. Shopify also raised concerns about the clarity, scope, feasibility, and legality of the request, particularly in relation to privacy laws and data stored abroad.

Court’s reasoning and analysis
Justice Régimbald ruled that the Convention, while binding on Canada internationally, had no domestic legal force in the context of UPRs under subsection 231.2(3) of the ITA. The Court emphasized Canada’s dualist approach to international law: treaties must be legislatively incorporated to have domestic effect. Since subsection 231.2(3) does not mention listed international agreements (unlike subsection 231.2(1)), the Court could not interpret it to include the Convention.

Although the Minister’s UPR might otherwise meet the legal criteria of targeting an “ascertainable group” and serving a compliance purpose, the application failed at the threshold issue—lack of statutory authority to enforce the Convention in this context. The Court also analyzed broader interpretive principles, residual discretion, and proportionality but deemed those moot due to the threshold failure.

Outcome
The Court dismissed the Minister’s application for judicial authorization of the UPR. Shopify was awarded $5,000 in lump-sum costs. The Court clarified that while the Convention applies to named persons requests under subsection 231.2(1), it does not apply to UPRs unless Parliament amends the law to say so.