Canada’s New Counter-Tariffs Start September 8: What Importers Should Check Now

Key Takeaways

Canada will introduce a new round of counter-tariffs on selected products originating in the United States on September 8, 2026.

The measures cover approximately C$27.6 billion in U.S. imports and apply additional tariff rates of 15%, 25% or 50%, depending on the individual Canadian tariff item.

Major affected sectors include steel and aluminum, dairy products, appliances, agricultural equipment, pulp and paper, plastics and electronics.

Importers should not apply a single tariff assumption across an entire product category. The official Canadian list operates at the individual tariff-item level.

When Do the New Tariffs Start?

The new countermeasures take effect at 12:01 a.m. on September 8, 2026.

The timing matters for shipments already moving toward Canada because the Government of Canada has provided an in-transit exception for qualifying goods.

What Tariff Rates Will Apply?

The new Canadian counter-tariffs use three principal additional rates:

• 15%
• 25%
• 50%

The rate applicable to a shipment depends on the specific tariff item listed in the Canadian measure.

Canada states that individual product rates broadly match the corresponding U.S. rates applied to Canadian goods under the relevant U.S. tariff actions.

Which Sectors Are Most Affected?

The Canadian government identifies several sectors as major targets of the September 8 measure, including:

• Steel and aluminum
• Dairy products
• Household appliances
• Agricultural equipment
• Pulp and paper
• Plastics
• Electronics

Existing Canadian counter-tariffs on other U.S. products, including certain automotive measures, continue separately.

Steel and Aluminum Can Face 50%

One important change concerns selected steel and aluminum products.

Canada states that existing counter-tariffs in some steel and aluminum categories will increase from 25% to 50% in order to match U.S. tariff levels.

Importers in metal-intensive industries should therefore recheck every affected tariff item rather than relying on a previously calculated 25% surtax.

Origin Matters More Than the Shipping Country

The September counter-tariffs apply to goods originating in the United States.

For this measure, Canada states that U.S.-origin goods are those eligible to be marked as goods of the United States under the Canadian country-of-origin marking rules applicable to CUSMA countries.

This means the country from which a shipment is dispatched is not necessarily sufficient to determine whether the surtax applies.

For example, routing U.S.-origin merchandise through a third-country warehouse does not automatically change its origin.

The In-Transit Exception

The Canadian government has confirmed that the new countermeasures do not apply to qualifying U.S. goods that are already in transit to Canada on the date the measures enter into force.

This makes transport documentation especially important for shipments moving close to September 8.

Importers should retain evidence showing when the goods began their direct and continuous movement toward Canada and confirm the exact administrative requirements once the applicable CBSA customs notice is available.

Do Not Use the Product Description Alone

The Canadian list is published at the tariff-item level.

Broad descriptions on the government page are indicative and should not replace tariff classification.

An importer should therefore follow this sequence:

1. Determine the correct Canadian tariff classification.
2. Check the exact tariff item against the September 8 counter-tariff list.
3. Confirm the additional rate associated with that tariff item.
4. Verify U.S. origin.

Why Classification Errors Become More Expensive

When an additional tariff reaches 25% or 50%, an incorrect classification can create a large financial difference.

Importers should review products that sit near classification boundaries, especially complex machinery, steel articles, electronic components and appliances.

If classification is uncertain, the importer should consider obtaining professional customs advice or using Canada's advance-ruling procedures where appropriate.

Recalculate Landed Cost

Companies importing covered U.S. goods should update landed-cost calculations before the measure takes effect.

The review should include:

• Purchase price
• Normal customs duty
• New counter-tariff
• Freight and insurance
• GST or other applicable taxes
• Brokerage and customs charges
• Warehousing and inland transport

A product that remained commercially viable under a 25% surtax may not remain viable if its applicable rate increases to 50%.

Review Incoterms and Contracts

The economic impact of the new tariff depends partly on who is contractually responsible for Canadian import duty.

Businesses should review their Incoterms and purchase contracts to determine:

• Who acts as importer of record
• Who bears customs duty and surtax
• Whether tariffs trigger a price-adjustment clause
• Whether purchase orders can be renegotiated
• Whether alternative sourcing is permitted

Existing Tariffs Have Not Disappeared

The September 8 action should not be viewed in isolation.

Canada already has other counter-tariffs on U.S. products, and the Department of Finance maintains a consolidated list covering the applicable tariff items, effective dates and rates.

Importers should therefore check the consolidated Canadian resource rather than looking only at the new September list.

What Importers Should Do Before September 8

1. Export the SKU List

Create a list of all U.S.-origin goods currently purchased or expected to enter Canada after September 8.

2. Confirm Canadian Classification

Do not rely only on the U.S. HTS classification used by the supplier.

3. Match the Tariff Item

Compare the Canadian classification against the government's official counter-tariff list.

4. Confirm Origin

Document why the goods are or are not considered U.S.-origin for the purposes of the measure.

5. Identify In-Transit Shipments

Separate shipments already moving toward Canada from shipments that will begin transportation after the effective date.

6. Update Landed Cost

Apply the correct 15%, 25% or 50% additional tariff to affected SKUs.

7. Inform Finance and Procurement

Customs changes should flow into purchasing decisions, customer pricing and margin analysis.

A Practical September 8 Checklist

• Confirm the Canadian tariff item for every potentially affected SKU.
• Check the authoritative September 8 product list.
• Confirm the applicable 15%, 25% or 50% rate.
• Verify U.S. origin.
• Identify goods qualifying for in-transit treatment.
• Retain transportation evidence for in-transit shipments.
• Recalculate landed cost.
• Review purchase contracts and Incoterms.
• Update ERP or customs-surtax logic.
• Check CBSA customs notices before entry.

What About Future Changes?

The current list was updated by the Canadian government as of August 26, 2026 and the Department of Finance maintains a consolidated tariff-response page.

Because tariff measures can be amended, suspended or expanded, importers should verify the official list again before customs entry rather than treating a downloaded spreadsheet as permanently current.

Conclusion

Canada's September 8 counter-tariffs create an immediate landed-cost issue for importers of selected U.S.-origin goods.

The measures cover C$27.6 billion of imports and use additional tariff rates of 15%, 25% and 50% across a wide range of industrial and consumer products.

The most important compliance steps are to confirm Canadian tariff classification, verify U.S. origin, identify in-transit shipments and recalculate landed cost before entry.

For businesses with large U.S.-Canada flows, the tariff review should be performed at the SKU level rather than by broad product category.

FAQ

When do Canada's new counter-tariffs take effect?

They take effect at 12:01 a.m. on September 8, 2026.

What are the new tariff rates?

The listed products are subject to additional rates of 15%, 25% or 50%, depending on the individual Canadian tariff item.

How much trade is covered?

The Government of Canada states that the September measure covers approximately C$27.6 billion of imports from the United States.

Which industries are targeted?

Major sectors include steel and aluminum, dairy, appliances, agricultural equipment, pulp and paper, plastics and electronics.

Do the tariffs apply to goods shipped from any country?

No. The September counter-tariffs apply to goods considered to originate in the United States under the relevant Canadian origin rules.

What happens to goods already in transit on September 8?

Canada states that the new countermeasures do not apply to qualifying U.S. goods already in transit to Canada when the measures come into force. Importers should retain appropriate transportation evidence and review CBSA implementation guidance.

Are these the only Canadian counter-tariffs on U.S. goods?

No. Other counter-tariffs already exist and continue to apply. The Department of Finance maintains a consolidated list.

Official References

• Department of Finance Canada — List of U.S. products subject to counter-tariffs effective September 8, 2026
• Department of Finance Canada — Complete list of U.S. products subject to Canadian counter-tariffs
• Canada Border Services Agency — Customs Tariff and Customs Notices

This article provides general customs and trade information and does not constitute legal or customs advice. Tariff treatment depends on the exact Canadian classification, country of origin, entry date and administrative rules in force at the time of import. Businesses should confirm current requirements with the Department of Finance Canada, CBSA and qualified customs advisers before entry.