Canadian Supply Chain Rules and Regulations: Latest Changes for Importers

October 13, 2026 | ATN Trade & Finance

Several significant regulatory changes have hit Canadian importers in the past six weeks. Here is what took effect, what is still pending, and what your customs documentation needs to reflect right now.

Canada's US Surtax: In Effect Since September 8

Canada's retaliatory surtax on approximately $27.6 billion in US goods took effect September 8 under the United States Surtax Order (2026), responding to US Section 338 and Section 232 tariffs. Rates are 15%, 25%, or 50% depending on the specific tariff item — not the broad product category — covering sectors including steel, dairy, appliances, agricultural equipment, electronics, seafood, pulp and paper, beauty products, and clothing.

Canadian importers of US-origin goods must declare the surtax through the CARM Client Portal, EDI, or API, using codes 26186A (15%), 26186B (25%), or 26186C (50%) in field 85 of the Commercial Accounting Declaration. De minimis shipments are not exempt. Goods in transit on September 8 may be exempt with supporting documentation such as a bill of lading. Existing steel remission orders are expected to extend to the new tariffs, but importers should apply at the time of entry rather than waiting for a refund.

New Aluminum Origin Reporting: In Effect Since October 1

As of October 1, importers of aluminum goods covered by General Import Permit No. 83 must declare three new data elements in every Integrated Import Declaration through CBSA's Single Window Initiative: Country of Largest Smelt (CLS), Country of Second-Largest Smelt (C2S) where applicable, and Country of Most Recent Cast (CRC). The requirement flows from Customs Notice 26-15. Exemptions apply to CSA-importer releases and shipments valued at CAD $5,000 or less. Importers who have not already done so need to confirm that their overseas suppliers can provide this smelting origin data and that their customs broker or trade software is capturing and transmitting all three fields.

Wood Cabinet and Vanity Surtax: Ongoing

A provisional 25% safeguard surtax on specified wood cabinets, vanities, and subassemblies took effect July 31, 2026, and runs for up to 200 days. Eligibility is determined by specific tariff item descriptions in Customs Notice 26-17 — not general product names. Importers should review open orders and any bonded inventory for exposure.

CPTPP: UK and Crown Dependencies Now Eligible

Effective September 1, 2026, goods from the UK, Channel Islands, and Isle of Man became eligible for CPUKT (CPTPP) preferential treatment under Customs Notice 26-22. The benefit is not automatic: goods must qualify under the rules of origin, and importers need current origin documentation to support the claim at entry.

Pending: CBSA "Last Sale" Valuation Proposal

The CBSA is still working through a proposal to adopt a "last sale" valuation rule, which would require duties to be calculated on the final sale price to Canadian buyers rather than the first sale price. For goods moving through multi-tier supply chains, this would increase declared values and duty obligations. No implementation date has been announced, but importers with complex sourcing structures should be modelling the cost impact now.

What this means for importers: Three changes are already live and require action: the US surtax (CARM coding and documentation), the aluminum smelt-origin fields (supplier data and systems), and the CPTPP UK expansion (origin certification). The wood cabinet surtax adds a fourth for relevant product categories. Together, they represent the most documentation-intensive compliance environment Canadian importers have faced in years — and the last-sale valuation proposal hasn't landed yet.

Sources:

Canadian Supply Chain Rules and Regulations: Latest Changes for Importers

Canadian Supply Chain Rules and Regulations: Latest Changes for Importers

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