Canada's Counter‑tariffs Under the United States Surtax Order (in Force 8 Sept 2026): Scope, Rates and What Importers Must Do Now

Canada’s counter‑tariffs under United States surtax measures came into force at 12:01 a. m. on 8 September 2026 under the United States Surtax Order (2026), imposing additional duties of 15%, 25% or 50% on a defined list of goods originating in the United States. For importers, manufacturers, customs brokers and in‑house counsel, this is an immediate and material change to landed cost, contract economics and compliance risk. The surtax is applied on the value for duty of affected shipments at the time of importation, layered on top of any existing customs duties.

This guide sets out the legal basis, the scope by rate band, how to classify and value goods, how to apply for remission, and the contractual steps businesses should take now to manage exposure. It is written for practical use, but legal statements should be confirmed against the primary government sources cited throughout and reviewed with qualified Canadian trade counsel.

Search intent: Practical compliance and mitigation, step‑by‑step guidance for importers, customs brokers, manufacturers and legal counsel to determine whether shipments are subject to the surtax, how to calculate duties, how to apply for remission, and what contract clauses to consider.

Contributed by: Global Law Experts, International Trade & Customs panel. For jurisdiction‑specific advice, contact International Trade counsel through the GLE directory.

Quick summary and key facts

• In force: 12:01 a.m. on 8 September 2026 under the United States Surtax Order (2026).
• Rate bands: 15%, 25% and 50% surtax, applied by tariff line to goods originating in the United States.
• Legal basis: Order made under the surtax authority of Canada’s Customs Tariff; the operative product list is published by the Department of Finance.
• Affected goods: Set out in the Department of Finance list of products from the United States subject to counter‑tariffs effective 8 September 2026.
• Operational guidance: Provided in CBSA Customs Notice 26‑23, covering accounting, valuation and compliance for importers and brokers.
• Base for the surtax: The value for duty of the imported goods, as determined under the Customs Act.

At‑a‑glance rate table

Note: the assignment of specific tariff lines to each band is set out only in the Department of Finance list. Always confirm the band for a given line against that published list rather than relying on general categories.

What the United States Surtax Order is, legal basis and background

The United States Surtax Order (2026) is Canada’s retaliatory measure in response to United States trade action affecting Canadian exports. Canada’s counter‑tariffs under United States surtax rules are structured as an additional surtax on imports of listed goods that originate in the United States. The mechanism draws on the surtax authority in Canada’s Customs Tariff, which permits the Governor in Council to impose additional duties in response to acts, policies or practices of another government that adversely affect Canadian trade interests.

Two documents govern day‑to‑day application. The Department of Finance publishes the authoritative product list identifying which goods fall within each rate band, and the Canada Border Services Agency (CBSA) issues Customs Notice 26‑23 setting out how the surtax is collected, accounted for and administered at the border. The formal Order itself is published in the Canada Gazette, which is the definitive source for the instrument’s text and for any subsequent amendments or expiry notices.

Canada has, in previous rounds of countermeasures, described its approach as a “dollar‑for‑dollar” style response, calibrating the value of affected imports to the value of the United States action being answered. That framing helps explain why the list is selective rather than universal: it is designed to concentrate pressure on particular sectors while limiting collateral harm to Canadian supply chains that depend on United States inputs. In international law terms, retaliatory measures of this kind sit within the broader framework of trade remedies and dispute settlement administered by the World Trade Organization, though the domestic legal authority for the surtax is the Customs Tariff.

Timeline of key dates and documents

• August 2026: Department of Finance publishes the list of products subject to counter‑tariffs, confirming the 8 September effective date and the three rate bands.
• 8 September 2026, 12:01 a.m.: The United States Surtax Order (2026) comes into force; the surtax applies to affected goods accounted for on or after this time.
• On or around the in‑force date: CBSA issues Customs Notice 26‑23 providing operational and valuation guidance to importers and brokers.
• Ongoing: The formal Order and any amendments are published in the Canada Gazette; importers should monitor for changes to the list or the rates.

Scope, which goods are subject and the applicable rates under Canada’s counter‑tariffs under United States surtax

Scope is determined line by line. A shipment is caught only if it originates in the United States and its tariff classification appears on the Department of Finance list. The list assigns each affected tariff line to one of the three rate bands, so two products in the same broad category can attract different surtax rates depending on their precise classification. This is the single most important point for compliance: rate exposure follows the tariff line, not the general description of the goods.

The surtax is calculated on the value for duty of the goods and is applied at importation, in addition to any customs duty otherwise payable. Certain goods and situations may fall outside the surtax, for example, goods that do not originate in the United States, or lines simply not included on the Department of Finance list. Because the list is the operative instrument, general assumptions about “US goods” are unreliable; each SKU must be checked against the published tariff lines and rate assignments.

Tariff rate bands and representative examples

The examples below are illustrative only. The definitive assignment of any product to a band is found in the Department of Finance list, which must be checked by tariff line before accounting for goods.

How to check whether a specific HS code is included

To confirm exposure for any product, work from the classification rather than the description:

1. Confirm the correct tariff classification for the goods using CBSA’s tariff classification and Customs Tariff resources.
2. Search the Department of Finance product list for that tariff line and note the assigned rate band.
3. Confirm the origin of the goods, the surtax applies to goods originating in the United States.
4. Cross‑check against CBSA Customs Notice 26‑23 for any operational qualifications or accounting instructions relevant to that line.

Where the Department of Finance list and CBSA operational materials appear to differ, treat the discrepancy as a compliance flag and seek confirmation before accounting for the goods.

Duration, review periods, and how to confirm whether tariffs remain in effect

Countermeasures of this nature can be amended, expanded or withdrawn as the underlying trade dispute evolves. To verify current status, importers should monitor the Department of Finance for list updates, the Canada Gazette for amendments or expiry of the Order, and CBSA notices for operational changes. Building a periodic check into compliance routines, for example, before each large shipment or contract renewal, reduces the risk of applying an outdated list or rate.

Classification, HS codes, how to identify tariff lines and common pitfalls

Because Canada’s counter‑tariffs under United States surtax rules operate at the tariff‑line level, accurate classification is the foundation of compliance. Errors flow directly into duty exposure, penalties and reassessment risk. Importers and brokers should confirm classification using CBSA’s Customs Tariff schedules and tariff lookup tools, and document the reasoning behind each classification decision.

Composite and multi‑component goods are a frequent source of difficulty. Where an article combines materials or functions, classification turns on interpretive rules and on which component gives the article its essential character. Small differences in specification, processing or assembly can move a product between tariff lines, and therefore between rate bands or out of scope entirely. For any ambiguous product, the safest course is to obtain certainty in advance rather than to self‑assess and face reassessment later.

When reclassification is possible, risks and best practice

Reclassification is legitimate where the original classification was incorrect and a defensible alternative applies on the facts. It is not a device to avoid duty by mischaracterising goods. Reclassifying solely to escape the surtax, without a genuine technical basis, exposes an importer to penalties, interest and reputational risk on audit. Best practice is to base any classification change on the objective characteristics of the goods, supported by technical specifications, and to retain the analysis on file.

How to request an advance ruling from CBSA

Where classification is uncertain or commercially significant, an advance ruling from CBSA can provide certainty for the goods described. In general terms, the importer submits a written request with a full product description, technical specifications, samples or literature as appropriate, and the proposed classification with supporting reasoning. A ruling helps protect the importer against later reassessment for identical goods and is particularly valuable where the difference between rate bands is large. Because processing takes time, requests for high‑value or high‑volume lines should be prioritised early. Follow CBSA’s current published requirements and forms for advance rulings when preparing a request.

Valuation and calculating the surtax (value for duty), worked examples

The surtax is charged on the value for duty of the imported goods, determined under the valuation provisions of the Customs Act. The primary method is the transaction value, broadly, the price paid or payable for the goods when sold for export to Canada, adjusted as the Act requires. Depending on the terms of sale, the value for duty may include or exclude elements such as freight and insurance, and may require additions for assists, royalties and licence fees where those conditions are met. Getting the value for duty right is essential, because the surtax percentage is applied to it directly.

Worked example 1, goods on the 25% band

Assume goods classified on a tariff line assigned to the 25% band, with a value for duty of CAD 100,000 and an assumed existing customs duty of 5% (the actual customs duty rate depends on the specific tariff line).

• Customs duty (illustrative 5%): CAD 100,000 × 5% = CAD 5,000.
• Surtax: CAD 100,000 × 25% = CAD 25,000.
• Total duty and surtax: CAD 30,000, calculated on the CAD 100,000 value for duty before other taxes.

The surtax alone adds a quarter to the value for duty, materially changing landed cost and margin.

Worked example 2, goods on the 50% band

Assume goods on a tariff line in the 50% band, with a value for duty of CAD 200,000.

• Surtax: CAD 200,000 × 50% = CAD 100,000.
• Any applicable customs duty is calculated separately on the same value for duty and added.

Here the surtax equals half the value for duty, a decisive commercial signal to evaluate alternative sourcing, remission eligibility or contractual cost recovery.

Common valuation errors and how to avoid them

• Understating the value for duty: Omitting dutiable additions such as assists or royalties understates both duty and surtax and invites reassessment.
• Misapplying freight and insurance: Whether these are included depends on the terms of sale and the valuation method; treat them consistently and document the basis.
• Using the wrong valuation method: The transaction value method has conditions; where it does not apply, alternative methods under the Customs Act must be used in the prescribed order.
• Inconsistent currency conversion: Apply the correct rate and record it, as errors compound across the duty and surtax calculation.

Accounting entries and customs accounting implications

The surtax must be reported and accounted for through CBSA’s import accounting processes in line with Customs Notice 26‑23. Importers should ensure their broker instructions, ERP pricing and duty‑accrual entries reflect the surtax band for each affected line, and that supporting valuation records are retained for the period required under the Customs Act in case of audit or verification.

Origin rules, proving US origin, documentation, and exemptions

The surtax applies to goods that originate in the United States. Correctly establishing origin therefore determines whether Canada’s counter‑tariffs under United States surtax rules apply to a given shipment. Importers claiming that goods are not of United States origin should hold documentation supporting that position, for example, origin declarations, certificates or other evidence consistent with the applicable origin framework, including CUSMA (the Canada–United States–Mexico Agreement) where relevant. Where goods genuinely originate outside the United States, the surtax should not apply, but the burden of demonstrating that origin rests with the importer.

Robust recordkeeping is essential. On verification, CBSA may require evidence of where goods were produced, the inputs used and the processing performed. Importers should retain purchase records, supplier declarations, production data and shipping documents that together support the origin claimed. Note that the origin rules that apply for surtax purposes may differ from preferential rules of origin under a free trade agreement, so confirm the correct rules for the surtax before relying on a determination.

When supply chain changes affect origin

Restructuring supply chains to change origin can be legitimate, but must reflect substantive changes in production rather than paper routing. Transshipment through a third country does not change origin, and mere relabelling will not withstand verification. Any origin‑based mitigation should be built on genuine changes to where and how goods are produced, documented thoroughly, and stress‑tested against the applicable origin rules before reliance.

Remission, refunds, appeals and compliance procedures

Where the surtax causes disproportionate harm, for example, where no reasonable domestic or non‑United States alternative exists, importers may be able to seek relief. CBSA Customs Notice 26‑23 is the operational reference for how the surtax is administered, and it, together with Department of Finance guidance, indicates whether and how remission or refund routes are available. Any remission process for these measures is established by the Government of Canada; importers should confirm the current availability, grounds and procedures against Department of Finance and CBSA guidance before filing.

A remission or refund submission should be evidence‑led. Prepare the following before filing:

1. Identify the affected tariff lines, rate bands and the surtax paid or payable.
2. Assemble import documentation, valuation records and origin evidence.
3. Set out the grounds for relief with supporting commercial evidence (sourcing analysis, supply constraints, contract dates).
4. Quantify the surtax impact clearly, with calculations tied to the value for duty.
5. Submit through the process indicated in the applicable Government of Canada guidance, within any applicable deadlines, and retain proof of filing.

Practical tips for building a strong remission submission

• Lead with evidence, not assertion: document the lack of alternatives rather than simply stating it.
• Show the commercial harm with figures tied to the value‑for‑duty calculations above.
• Demonstrate diligence: show that alternative sourcing was genuinely investigated.
• Keep records contemporaneous and consistent with what was declared at the border.

When to consider appeal or judicial review

If a classification, valuation or relief decision is disputed, importers generally have recourse to reconsideration and review mechanisms under the Customs Act, and ultimately to judicial review of decisions made under the relevant statutory authority. Litigation is a last resort, appropriate where a decision is legally flawed and the amounts or precedent justify the cost. Legal advice should be obtained early, because appeal routes carry deadlines and the strength of any challenge depends heavily on the record built at the outset.

Commercial and contractual implications, pricing, passthroughs and drafting clauses

Canada’s counter‑tariffs under United States surtax rules change the economics of existing and future contracts, and the central commercial question is who bears the cost. Businesses should review supplier and customer agreements to determine whether the surtax can be passed through, absorbed or shared, and should address the point expressly in new contracts rather than leaving it to be argued after the fact.

Key drafting levers include price‑adjustment clauses that allow prices to move with changes in duties and surtaxes; change‑in‑law provisions that allocate the risk of new government measures; and clear notice and evidence requirements so that any adjustment is transparent and auditable. Force majeure is generally a poor fit for tariff changes, because a surtax rarely prevents performance, a dedicated change‑in‑law mechanism is usually the better tool. Audit and cost‑recovery rights help ensure that any pass‑through reflects the surtax actually incurred.

Buyer vs seller responsibilities under Incoterms

The chosen Incoterm influences who is responsible for import duties and, in practice, who initially bears the surtax. Under terms where the buyer clears goods for import, the buyer typically carries the surtax; under delivered‑duty‑paid arrangements, the seller may bear it. Parties should align their Incoterm choice with their commercial intention on tariff risk and confirm that price and clause drafting are consistent with it.

Insurance, hedging and alternative mitigation strategies

• Sourcing: Evaluate non‑United States or domestic suppliers where the 50% band makes United States sourcing uneconomic.
• Inventory management: Manage flows and stock positions with the in‑force date and rate bands in mind.
• Contractual allocation: Use price‑adjustment and change‑in‑law clauses to allocate risk clearly.
• Relief applications: Pursue remission where grounds exist and the surtax impact is material.

Practical compliance checklist and immediate steps for importers

The following ten steps translate Canada’s counter‑tariffs under United States surtax obligations into immediate action:

1. Identify all SKUs sourced from the United States and map them to tariff lines.
2. Verify HS classification for each affected line using CBSA tariff resources.
3. Cross‑check each line against the Department of Finance list to confirm the rate band.
4. Confirm origin and retain supporting documentation.
5. Update customs accounting and broker instructions in line with Customs Notice 26‑23.
6. Recalculate landed cost using the value‑for‑duty method and revised surtax rates.
7. Notify suppliers and open negotiations on cost sharing where appropriate.
8. Review and amend contracts to address pass‑through, notice and change‑in‑law.
9. Assess remission eligibility and begin assembling supporting evidence.
10. Update ERP pricing, communicate with customers, and seek qualified legal counsel.

Contact points and templates to prepare

• A request for a CBSA advance ruling for uncertain or high‑value lines.
• A remission cover letter template setting out grounds, evidence and quantified impact.
• A tariff impact calculation for each affected SKU, tied to value for duty.

For jurisdiction‑specific support, consult the International Trade & Customs practice page, Canada and use the GLE directory to find an International Trade lawyer in Canada.

Conclusion

Canada’s counter‑tariffs under United States surtax measures are now in force and impose real, immediate cost on a wide range of imports from the United States. The compliance logic is line‑by‑line: confirm classification, confirm origin, confirm the rate band on the Department of Finance list, and calculate the surtax on the correct value for duty under the Customs Act. Where the impact is significant, particularly in the 50% band, remission, sourcing changes and contractual allocation of risk should be evaluated without delay. Because the list and the Order can change, importers should monitor the Department of Finance, CBSA and the Canada Gazette and build periodic checks into their processes.

This guide is general information, not legal advice; given the amounts at stake and the audit exposure, businesses should confirm their position against the primary sources below and take qualified Canadian trade counsel on Canada’s counter‑tariffs under United States surtax obligations.

Sources

1. Department of Finance, List of products from the United States subject to counter‑tariffs (effective 8 September 2026)
2. Canada Border Services Agency, Customs Notice 26‑23: United States Surtax Order (2026)
3. Canada Gazette
4. Justice Laws Website, Customs Act
5. Justice Laws Website, Customs Tariff
6. CBSA, Tariff classification and Customs Tariff resources
7. World Trade Organization