The US imposed a 50% tariff on roughly $20 billion in Canadian goods under Section 338 of the Tariff Act of 1930, effective August 22, 2026. This guide covers which products are affected, how tariff stacking works, what Canada’s retaliatory tariffs mean for US exporters, and how US-based fulfillment infrastructure can reduce cross-border tariff exposure.
Estimated reading time: 10 min
The US-Canada tariff environment changed significantly on August 22, 2026. Three presidential proclamations under Section 338 of the Tariff Act of 1930 imposed a 50% additional duty on specified Canadian goods, covering roughly 569 product categories and approximately $20 billion in annual imports. Canada has announced dollar-for-dollar retaliatory tariffs effective September 8.
For ecommerce brands with any part of their supply chain touching Canada, the operational and financial impact is immediate. Landed cost models, fulfillment routing, and inventory allocation strategies built before August 22 are now out of date for affected product lines.
Who This Guide Is For: Ecommerce brands sourcing finished goods or components from Canada, DTC and retail sellers shipping cross-border into Canada, and supply chain operators evaluating whether to shift fulfillment domestically to reduce tariff exposure.
Contents
- What Is Section 338 and Why Does It Matter Now
- Which Products Are Covered
- USMCA Does Not Exempt Covered Goods
- How Tariff Stacking Works Under Section 338
- Canada’s Retaliatory Tariffs on US Goods
- What This Means for Ecommerce Brands
- Fulfillment Strategies to Reduce Tariff Exposure
- Why DCL Is Built for Tariff-Disrupted Supply Chains
- FAQ
What Is Section 338 and Why Does It Matter Now
Section 338 is a provision within the Tariff Act of 1930 that authorizes the president to impose new or additional duties of up to 50% on goods from any country found to discriminate against US commerce. It has rarely been invoked at scale. The August 2026 action against Canada represents the first modern use of Section 338 for a tariff action of this magnitude.
On July 20, 2026, President Trump signed three separate proclamations, each targeting a specific trade dispute with Canada. The tariffs were originally set to take effect August 19 but received a three-day suspension to allow for final trade negotiations. Those negotiations collapsed on August 22, and the tariffs took effect automatically at 12:01 a.m. Eastern Time.
The three named disputes driving the action are:
- Dairy: Canada’s supply-managed dairy system and tariff-rate quota administration, which the US argues grants more favorable treatment to EU cheese imports than to comparable American dairy exports.
- Alcoholic beverages: After most Canadian provinces pulled American liquor from their shelves, Canadian imports of US alcoholic beverages dropped approximately 81%, from $718 million to $137 million.
- Motor vehicles: Canadian motor vehicle exports to the US fell approximately 22% (from $25.9 billion to $20.3 billion) over the year ending March 2026, and the administration frames the tariff as offsetting Canadian discrimination against US automotive commerce.
Unlike the Section 122 surcharge that expired earlier in 2026, Section 338 tariffs have no built-in expiration date. The duties remain in effect until the administration changes or removes them through a new proclamation.
Which Products Are Covered
The headlines focus on dairy, motor vehicles, and alcoholic beverages, but the actual product coverage extends far beyond those three categories. Each proclamation includes an Annex II, and those annexes are where the real breadth of coverage lives. The US Trade Representative estimates the three proclamations collectively cover nearly $20 billion in Canadian imports across hundreds of eight-digit HTS classifications, roughly 5.2% of the $382 billion in goods the US imported from Canada in 2025.
Beyond the headline categories, covered products include cement, plywood, furniture, hockey sticks, seeds, clothing, fishing rods, wigs, swimming pools, electronics, and a range of other consumer and industrial goods.
| Category | Example Products | Proclamation | Rate |
|---|---|---|---|
| Dairy | Cheese, butter, milk products | Proclamation 11047 | 50% |
| Alcoholic Beverages | Beer, spirits, wine | Proclamation 11046 | 50% |
| Motor Vehicles | Passenger vehicles, light trucks | Proclamation 11048 | 50% |
| Broad Annex II Coverage | Cement, plywood, furniture, textiles, electronics, seeds, consumer goods | Proclamation 11048 Annex II | 50% |
Excluded from Section 338: energy, potash, fish, critical minerals, civil aircraft goods qualifying under General Note 6 of the HTSUS, and any product already subject to Section 232 tariffs. That last exclusion is significant because it means steel, aluminum, copper, autos already under 232, semiconductors, pharmaceuticals, and wood products do not face the additional 50%.
One critical detail: duty applies based on where a product was manufactured, not where it ships from. A Canadian-made component routed through a US fulfillment center or customs broker is still Canadian-origin for tariff purposes.
USMCA Does Not Exempt Covered Goods
This is the single most important operational detail for brands with cross-border supply chains. A valid USMCA (formerly CUSMA) certificate of origin does not exempt goods from Section 338 duties. Covered Canadian-origin products owe the 50% whether or not they qualify as USMCA-originating.
Every prior tariff action against Canada trained importers to treat the USMCA certificate as a shield. Section 338 breaks that pattern deliberately. The proclamations explicitly state that covered goods may be subject to Section 338 duties even when they otherwise qualify for preferential treatment under the agreement.
USMCA does still matter for one specific interaction. The separate Section 301 forced-labor tariff (10%, effective July 24, 2026) applies to Canadian goods generally, but products entered duty-free under a USMCA claim are exempt from that 10% layer. So a Canadian-origin product on a Section 338 annex could face 50% (Section 338) plus 10% (Section 301 forced-labor) if it is not entered under USMCA, or 50% alone if it is. Brands that assumed USMCA would continue to neutralize tariff exposure need to reassess their landed cost calculations for every affected product line.
How Tariff Stacking Works Under Section 338
The 50% Section 338 rate is not a replacement for existing duties. It is an additional duty that stacks on top of the product’s ordinary MFN rate and any other applicable tariffs, taxes, and fees. For brands importing covered Canadian goods, the all-in duty rate can be substantially higher than the headline 50% suggests.
| Tariff Layer | Rate | Applies To | USMCA Exempt? |
|---|---|---|---|
| MFN (base duty) | Varies by HTS code | All imports | Yes |
| Section 301 (forced labor) | 10% | 60 economies incl. Canada | Yes |
| Section 338 | 50% | Specified Canadian-origin goods | No |
| Section 232 | 25% (varies) | Steel, aluminum, copper, autos, semiconductors, etc. | N/A (excluded from 338) |
The anti-stacking rule between Section 232 and Section 338 is important to understand precisely. Goods already carrying a Section 232 duty are excluded from Section 338 entirely. This is not a blanket exemption. It means those goods escape the 50% only because they already face a 232 rate. Importers should confirm what each Canadian product line is already subject to before assuming the 50% applies or does not apply.
Here is a practical example. A Canadian-manufactured consumer electronics component (not covered by Section 232) with a 3% MFN base rate and no USMCA claim would face: 3% MFN + 10% Section 301 + 50% Section 338 = 63% total duty. The same component entered under a valid USMCA claim would face: 0% MFN + 0% Section 301 (exempt under USMCA) + 50% Section 338 = 50% total duty. USMCA still saves 13 percentage points in this scenario, but the 50% floor is unavoidable. For a broader look at how layered tariffs are reshaping ecommerce cost structures, see DCL’s tariff impact analysis.
One additional trap: goods sitting in a foreign-trade zone (FTZ) generally needed to be admitted in privileged foreign status before August 22, or they inherit the new duty when entered for consumption. This is an easy detail to miss if FTZ admissions are not actively managed.
Canada’s Retaliatory Tariffs on US Goods
On August 22, 2026, Canadian Prime Minister Mark Carney announced that Canada would match the US tariffs dollar-for-dollar. Effective September 8, 2026, Canada will impose counter-tariffs at 15%, 25%, and 50% on products covering approximately $27.6 billion in imports from the US. Rates for individual products are set to match the US rate on the same goods.
Canada’s retaliatory tariffs target sectors including steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. The counter-tariffs apply only to goods originating from the US, determined under the CUSMA country-of-origin marking regulations. An in-transit exemption means US goods already on their way to Canada on September 8 are not subject to the new duties.
This creates a two-sided tariff problem for brands operating across the border. US brands selling into Canada will see landed costs rise on covered product categories. Combined with the suspension of the Section 321 de minimis exemption (which ended duty-free entry for individual shipments under $800 in August 2025), the economics of shipping DTC from the US into Canada have deteriorated significantly. Brands running omnichannel operations with both US and Canadian customer bases now face tariff pressure in both directions. Tracking the cost impact requires tight supply chain metrics on landed cost, duty spend, and margin by channel.
What This Means for Ecommerce Brands
Brands Sourcing From Canada
Any finished goods or components manufactured in Canada and imported into the US now carry the additional 50% on covered categories, regardless of USMCA status. Landed cost modeling built before August 22 is out of date for every affected product line.
The immediate action is to confirm HTS classifications line by line against the three proclamation annexes. Misclassification can result in paying Section 338 on goods that are actually excluded (especially in Chapters 84 and 85, where Section 232 carve-outs apply), or worse, failing to pay on goods that are covered and facing a CBP audit later. Brands should also review inventory planning assumptions, since the cost basis for Canadian-sourced inventory has changed.
Brands Selling Into Canada
Canada’s September 8 retaliation raises the cost of US-origin goods entering Canada at rates of 15%, 25%, or 50% depending on the product category. Brands shipping DTC or B2B from US facilities into Canada will see higher duties either passed to the end consumer or absorbed into margin.
The old model of low-friction cross-border fulfillment is gone. Between the de minimis suspension in August 2025, the Section 301 forced-labor tariff in July 2026, and now Section 338 plus Canadian retaliation, the cost of every border crossing has increased. Brands with significant Canadian customer bases should evaluate whether in-market fulfillment from Canadian facilities makes more financial sense than shipping cross-border from US warehouses.
Brands With Cross-Border Supply Chains
Components that cross the US-Canada border multiple times accumulate tariff exposure at each crossing. This is common in electronics, consumer packaged goods, and any category where raw materials, sub-assemblies, and finished goods move between the two countries during production. Shifting final assembly or fulfillment to the destination market reduces crossing events and the associated tariff load.
For brands that have considered nearshoring or domestic fulfillment consolidation, the Section 338 tariffs add quantifiable urgency. The 50% rate on covered goods makes the cost-benefit calculation for moving inbound logistics and fulfillment operations to the US significantly more favorable than it was before August 22.
Fulfillment Strategies to Reduce Tariff Exposure
Confirm HTS classification accuracy. Misclassification is the fastest way to overpay or underpay. The Section 232 exclusion means some products in Chapters 84 and 85 may not owe the 50%, but only if they are correctly classified under a 232-covered heading. Classification review should happen before the next entry, not after a CBP audit.
Consolidate fulfillment in the destination market. For US-bound orders, fulfilling from US-based ecommerce fulfillment facilities eliminates the per-shipment tariff event. Brands currently shipping from Canadian warehouses to US consumers face the 50% on every covered product at the border. Moving fulfillment stateside converts a per-order tariff cost into a one-time bulk import duty on inventory, which is easier to manage and forecast.
Optimize carrier costs to offset margin compression. Tariffs compress product margins directly. Shipping cost savings become a dollar-for-dollar offset. DCL’s SelectShip carrier optimization engine shops rates at dispatch using origin, weight, dimensions, and channel service requirements across both parcel and freight, delivering 10%–15% savings versus independent carrier management.
Use real-time inventory visibility to manage split-market stock. Brands operating inventory in both the US and Canada need clear visibility into which stock is allocated to which market and which tariff regime applies. eFactory, DCL’s proprietary platform combining OMS, TMS, EDI, and client portal functionality, provides live inventory counts, order status by channel, and shipment tracking across all facilities from a single dashboard.
Evaluate kitting and value-added services domestically. If kitting or assembly currently happens in Canada before US import, moving those operations stateside avoids the tariff on the finished kit. DCL operates dedicated value-added services teams (not general labor) for kitting, assembly, and custom packaging at its US facilities.
Review your fulfillment outsourcing model. For brands currently self-fulfilling from Canadian locations or using Canadian-based 3PLs for US orders, the tariff math has changed. Partnering with a US-based 3PL with inventory control systems and multi-facility distribution eliminates the cross-border tariff event for domestic orders while maintaining service levels.
Why DCL Is Built for Tariff-Disrupted Supply Chains
DCL Logistics operates seven US facilities totaling 680,000+ sq ft across Fremont CA (HQ), Ontario CA, Perris CA, Louisville KY, and York PA, giving brands domestic ecommerce fulfillment coverage that eliminates cross-border tariff events for US-bound orders. eFactory provides the real-time inventory and order visibility brands need to manage split-market inventory allocation across tariff-affected and tariff-free channels, with live counts, order status by channel, and shipment tracking from a single dashboard. SelectShip recovers margin on the shipping side, delivering 10%–15% carrier cost savings that directly offset tariff-driven margin compression.
Talk to DCL about reducing your tariff exposure →
Frequently Asked Questions
Does USMCA protect my Canadian imports from Section 338 tariffs?
No. Section 338 tariffs apply to covered Canadian-origin goods regardless of USMCA qualification. A valid certificate of origin does not provide an exemption. This is a deliberate departure from prior tariff actions, where USMCA origin typically shielded goods from additional duties. USMCA does still exempt qualifying goods from the separate Section 301 forced-labor tariff (10%), but that exemption does not extend to Section 338.
Which products are excluded from Section 338?
Energy, potash, fish, critical minerals, civil aircraft goods, and products already subject to Section 232 tariffs (steel, aluminum, copper, autos, semiconductors, pharmaceuticals, and wood products). This is an anti-stacking rule: those goods are excluded only because they already carry a Section 232 duty, not because of a blanket exemption.
Do Section 338 tariffs stack with other duties?
Yes. The 50% applies on top of the existing MFN duty rate and any other applicable duties, taxes, and fees. This includes the Section 301 forced-labor tariff (10%) for goods not entered duty-free under USMCA. The exception is Section 232 goods, which are excluded from Section 338 entirely. For a covered Canadian product with a 3% MFN rate and no USMCA claim, the total duty could reach 63% (3% MFN + 10% Section 301 + 50% Section 338).
When do Canada’s retaliatory tariffs take effect?
September 8, 2026. Canada will impose tariffs at 15%, 25%, and 50% on approximately $27.6 billion in US goods, with rates matching the corresponding US tariff on the same product category. Targeted sectors include steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics. US goods already in transit to Canada on September 8 are exempt from the counter-tariffs.
How can ecommerce brands reduce Section 338 tariff exposure?
The most direct strategy is consolidating fulfillment in the destination market. Brands fulfilling US orders from US-based warehouses eliminate the per-shipment tariff event on Canadian-origin goods. Additional strategies include confirming HTS classification accuracy (to ensure goods are not misclassified into or out of covered categories), optimizing carrier costs to offset margin compression, and moving any Canadian-based kitting or assembly operations stateside to avoid the tariff on finished kits.
