Canada’s September 2026 tariff developments create three separate origin and product-scope tests for importers. From September 8, specified U.S.-origin goods became subject to additional surtaxes. From September 17, provisional anti-dumping duties became payable on certain wheat gluten from Italy, Poland and the United Kingdom. A separate tariff-system update made the United Kingdom’s preferential treatment available for eligible goods effective September 1. For importers in Mississauga, Brampton and Toronto, the practical question is whether the shipment file proves the treatment being claimed—not simply where the goods were shipped from.
Three measures, three different tariff questions
The U.S. measure applies additional surtaxes of 15%, 25% or 50% to specified goods originating in the United States. The products are identified at the tariff-item level and include goods in sectors such as steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. The surtax is calculated on value for duty and is additional to regular customs duty and applicable GST/HST. The published measure excludes goods already in transit to Canada on September 8, 2026.
For this measure, the key test is U.S. origin. A shipment exported from the United States is not necessarily a U.S.-origin shipment. Importers generally need to review the tariff item, origin records and the transaction’s valuation before determining whether the surtax applies. The CBSA customs notice and Department of Finance product list provide the published details.
The wheat gluten measure asks a different question: whether the goods fall within the product definition covered by the preliminary dumping determination. Provisional anti-dumping duties apply to subject goods released by the CBSA on or after September 17, 2026, when originating in or exported from Italy, Poland or the United Kingdom. The goods are normally classified under tariff items 1109.00.10.00 and 1109.00.20.00, but classification alone does not establish that the product is subject to the measure.
The third development is preferential rather than punitive. The updated 2026 Customs Tariff added Comprehensive and Progressive United Kingdom Tariff treatment for eligible goods from the United Kingdom, the Channel Islands and the Isle of Man. The tariff entitlement is effective September 1, 2026, and the applicable tariff-treatment code is CPUKT, code 35. Shipment from the U.K. alone does not establish eligibility; the applicable rules of origin still need to be met.
What the distinction means for import accounting
Origin is not the same as export location
Importers should avoid using the exporting country shown on a commercial document as a substitute for origin analysis. That risk is most direct for the U.S. surtax, but the same discipline matters when assessing U.K. preferential treatment and the wheat gluten measure. A supply chain may involve production, processing, sale and export in different countries. The accounting record should identify which origin rule or product definition supports the treatment used.
Classification is a starting point, not the entire decision
The U.S. surtaxes are tied to listed tariff items, while the wheat gluten duties also require an assessment against the covered product definition. An importer of food ingredients, for example, may need to compare the commercial description and physical characteristics of the goods with the scope of the determination rather than relying only on the tariff number supplied by a vendor.
Preferential treatment requires positive support
For eligible U.K. goods, an importer claiming CPUKT treatment would generally be expected to confirm the relevant origin requirements and use code 35 where applicable. The availability of the treatment in the tariff system does not by itself prove that a particular product qualifies.
A practical review for GTA importers
Importers receiving goods through Pearson or moving commercial freight into Peel Region warehouses can separate the review into three records: the product record, the origin record and the accounting record. This is useful whether the goods are distributed in Toronto, stored in Mississauga or handled through a Brampton facility.
- Product record: retain the tariff classification, commercial description and, where relevant, enough product information to assess whether the goods fall within a listed tariff item or a trade-remedy product definition.
- Origin record: document the country of origin separately from the country of export. For U.K. preference claims, retain the information needed to support the applicable rules of origin.
- Accounting record: check the treatment code, value-for-duty basis and any additional duty or surtax calculation before the accounting is finalized. For wheat gluten subject to provisional duties, the published notice also identifies required exporter, producer, origin, product and transaction information.
The September measures should therefore be reviewed as different legal mechanisms rather than as one general tariff change. A U.S.-origin surtax review, a wheat gluten scope review and a U.K. preferential-origin review may involve the same shipment workflow, but they do not use the same eligibility test. Importers generally benefit from keeping those decisions separate in their customs records and escalation procedures.
Source notices and effective dates
| Development | Effective or publication date | Core test |
|---|---|---|
| Specified U.S.-origin surtaxes | September 8, 2026 | Listed tariff item and U.S. origin |
| Wheat gluten provisional anti-dumping duties | September 17, 2026 | Subject product, origin or export source, and release date |
| U.K. preferential tariff treatment | Entitlement effective September 1; updated tariff available September 16 | Eligible U.K.-related origin and applicable rules |
This article is general information, not a determination for a specific transaction. Importers with goods in one of the affected categories generally should match the shipment’s product, origin and accounting evidence to the relevant official notice before release or accounting.