Every example and amount on this page is illustrative. It shows the method and is not a benchmark, a quote or advice.
What the US–Canada tariff question actually measures
A customs duty is the charge assessed when goods enter the United States. It is determined by factors such as the product’s tariff classification, country of origin, customs value and shipment documentation. A Canadian shipping address does not, by itself, determine the duty. A product sold by a Canadian merchant may have been made in Canada, made elsewhere and shipped from Canada, or qualify for different treatment under applicable origin rules.
Total landed cost is broader than the customs duty. It is the cost of getting a specific unit into sellable inventory, including the product cost and relevant transport, insurance, brokerage, handling and duty charges. The correct scope depends on the merchant’s accounting policy and the shipment terms. Landed cost is therefore the measure for pricing, purchasing and inventory decisions; the duty is only one input.
Margin impact is the effect of that cost on the economics of the sale. A duty can leave the customer price unchanged while reducing gross profit and gross margin. It can also change the result differently across products if their costs, prices or duty treatment differ. ORVX computes product costs from a cost model and reports gross profit and margin at product and collection level, using realized revenue from delivered orders rather than treating cancelled or returned orders as revenue.
| Measure | What it describes | When to act on it |
|---|---|---|
| Customs duty | The border charge assessed on an import shipment | When checking import documentation, classification, origin or cash required at entry |
| Total landed cost | The cost of bringing a unit into sellable inventory | When setting prices, evaluating suppliers, or valuing inventory |
| Margin impact | How the resulting cost changes profit per sale and margin | When deciding whether a SKU, collection or channel remains economically viable |
The cost formula from invoice to gross margin
Start with the customs calculation, not the retail price. Convert the invoice product value into US dollars using the customs exchange rate applicable to the entry, rather than a later spot rate. Then identify the dutiable customs value under the product’s valuation rules. Freight, insurance, and other charges may be treated differently from the merchandise value, so keep each amount separately documented instead of assuming every import charge belongs in the duty base.
Apply any applicable exemption before calculating the duty. An exemption may remove an item from the duty base, reduce the dutiable value, or set the applicable duty rate to zero; the treatment depends on the exemption and the entry. The operational rule is to calculate duty from the resulting dutiable value and applicable rate, not to subtract a generic percentage from total logistics costs.
Landed cost answers what the inventory cost to arrive at your facility. It includes the converted product cost, freight, insurance, brokerage, duty, and other import charges you assign to the unit. Brokerage and freight therefore affect landed cost even when they are not part of the customs duty base. Allocate shipment-level costs consistently by unit, weight, value, or another documented method.
Gross margin is a sales measure, so use realized revenue from delivered units and keep operating expenses separate. Advertising, payment processing, fulfilment overhead, payroll, software, and general overhead are not part of the gross-margin formula unless your accounting policy explicitly classifies a particular cost as COGS. For category decisions, compare the margin before and after the duty or landed-cost change; for cash planning, track the full landed-cost dollars per unit.
- Customs value (USD) = invoice product value in the relevant foreign currency × applicable customs exchange rate, adjusted for required valuation additions or exclusions.
- Duty = dutiable customs value after applicable exemptions × tariff rate.
- Unit landed cost = converted unit product cost + allocated freight + allocated insurance + allocated brokerage + unit duty + other allocated import charges.
- Unit gross profit = realized revenue per delivered unit − unit landed cost.
- Gross margin (%) = unit gross profit ÷ realized revenue per delivered unit × 100.
| Measure | Includes | Use it to decide |
|---|---|---|
| Duty | Dutiable customs value, exemptions, and tariff rate | Estimate the border charge |
| Landed cost | Product, freight, insurance, brokerage, duty, and allocated import charges | Set SKU economics and inventory cost |
| Gross margin | Realized delivered revenue minus COGS | Assess product profitability before broader operating expenses |
A worked example for a Canadian-made SKU
Consider one Canadian-made SKU sold in the US for $80. Assume the customs value is $40, freight to the US is $5, and the applicable duty rate is 10%. The rate is an illustration; the product’s classification and origin treatment determine the actual duty. Before duty, landed cost is $40 + $5 = $45.
At the existing $80 price, the duty adds $40 × 10% = $4, increasing landed cost to $49. Gross profit falls from $80 − $45 = $35 to $80 − $49 = $31. Gross margin falls from $35 ÷ $80 = 43.75% to $31 ÷ $80 = 38.75%. This isolates the tariff effect; payment fees, fulfillment, advertising, returns and other operating costs are not included.
Where tariff calculations go wrong
Tariff calculations go wrong when a product-level estimate is treated as the final entry amount. An estimate answers: “What duty should this SKU carry if these assumptions are correct?” The final entry amount is the shipment-level amount reported and assessed at import, after classification, origin, customs value, entry timing, currency rules, and any applicable programs are applied. Use the estimate for pricing and assortment decisions; reconcile the final entry amount for accounting and margin reporting.
Classification is not a product description written for shoppers. The same broad category can contain different HTS classifications, rates, and additional measures. Origin is also separate from ship-from location: a parcel dispatched from Canada is not automatically Canadian-origin, and a Canadian seller does not make every imported component eligible for Canadian treatment. USMCA eligibility requires the product to satisfy the applicable origin rules and the required certification process; it should not be assumed from the seller’s address alone. These errors can make a reasonable-looking SKU estimate use the wrong rate.
Customs value is another common fault line. The amount paid by the customer may include retail markup, discounts, tax, and shipping that do not map directly to customs value. Freight allocation can also be mishandled: allocating inbound freight across units may be useful for landed-cost analysis, while the amount included in customs value depends on the applicable valuation rules and where the cost occurs. Adding freight to a landed-cost model and then adding it again as a separate tariff base is double counting.
Timing and currency create smaller-looking errors that compound across orders. The relevant entry date and customs exchange rate may differ from the Shopify order date or the rate used in a finance dashboard. Keep the customs calculation in its required reporting currency, then translate the resulting cost consistently for profitability analysis. A return or refund reduces realized ecommerce revenue, but it does not automatically erase the original import duty. Treat duty recovery or drawback as a separate, documented adjustment rather than assuming every refund reverses it.
For operating decisions, compare the reconciled entry duty with the product’s full cost model rather than inserting an estimate twice. ORVX reports realized revenue from delivered orders, refund value against revenue, and product-level gross and net profitability; that makes it possible to see whether a tariff assumption is affecting an actual SKU margin or merely a planning scenario. For category-specific context, see How Tariffs Affect Clothing Brands: A Margin Guide.
| Measure | What it captures | When to act on it |
|---|---|---|
| Product-level tariff estimate | Assumed classification, origin, value, rate, currency, and allocated freight for one SKU | Scenario pricing, sourcing, and assortment decisions |
| Final entry amount | Shipment-level duty assessed using the filed entry details and applicable timing | Reconcile landed cost, finance records, and realized margin |
How duties change decisions across exposed categories
A duty does not create the same operating problem in every category. The right response depends on how quickly the product becomes obsolete, how much inventory is already committed, and whether an alternative supplier can meet the same specification. Compare the exposed SKU or collection before changing a category-wide price or purchase plan.
The decision measures differ by category. Product and collection profitability show where the added cost is concentrated; contribution after advertising shows whether paid demand still supports the item. Inventory position, dead stock and remaining stock value show whether purchasing less protects cash or simply leaves an existing commitment stranded. For apparel, the apparel tariff margin guide covers the margin implications in more detail.
| Category | Pricing and purchasing decision | Inventory, sourcing and supplier-risk trade-off |
|---|---|---|
| Apparel | A price increase may protect unit margin, but can reduce sell-through on seasonal or promotional products. Rework purchase quantities by style, size and color rather than applying one rule to the whole range. | Holding extra units risks markdowns and dead stock after the season. A second factory can reduce concentration risk, but may require new samples, minimums, quality checks and lead time. |
| Automotive | Customers may compare the tariff-affected part with substitutes, so price changes should be tested against part-level contribution and order volume. Purchase planning should distinguish core replacement parts from optional accessories. | Compatibility, certification and tooling can make supplier changes slow or costly. A lower-cost source is not useful if it creates fit, warranty or return exposure. |
| Electronics | Protect margin on products with limited substitution, but avoid pricing inventory above the market once a model ages. Reforecast purchases when duty changes affect already-ordered units. | Obsolescence and component dependency increase the cost of excess stock. Dual sourcing lowers concentration risk but can introduce firmware, certification or performance differences. See the [electronics landed-cost guide](/resources/electronics-tariffs-in-ecommerce-landed-cost-and-margin). |
| Food and beverage | Shelf life limits how long a business can wait for demand to absorb a higher price. Review pack size, assortment and reorder cadence alongside price. | Domestic or alternate sourcing may reduce duty exposure, but ingredient consistency, labeling, food-safety approval and minimum volumes can constrain the switch. |
| Home and furniture | Large, expensive items may absorb a price change differently from low-ticket accessories. Evaluate contribution per delivered order, not revenue alone, before expanding or cutting purchases. | Bulky inventory ties up cash and storage capacity. Diversifying suppliers can increase freight complexity, damage risk and quality variation even when it reduces geographic concentration. |
What US canada tariffs ecommerce actually measures
The phrase “US Canada tariffs ecommerce” can refer to several different measures. They answer different operating questions, so a tariff percentage alone is not enough for a pricing, sourcing or marketing decision. A rate describes exposure. A dollar duty describes the cash charge on an entry. A duty-adjusted product cost shows what the item costs before fulfilment and selling expenses. Profitability measures show whether the SKU still earns money after the rest of the business costs are included.
Use the tariff rate when screening products, suppliers or origin changes. It is useful for identifying which SKUs require review, but it does not show the commercial impact by itself. Use duty dollars when planning the cash required to clear an inbound shipment or comparing two shipment scenarios. This is an entry-level measure: it applies to the imported goods, not automatically to every unit sold during the period.
Use landed product cost when deciding whether a product’s retail price, pack size or sourcing arrangement remains viable. It is the right bridge between customs data and ecommerce economics. For category-specific applications, see the clothing tariff margin guide, electronics landed-cost guide and beauty ecommerce tariff guide.
Use gross margin when assessing the product’s economics before advertising and other operating costs. Use contribution after advertising when deciding whether to scale, reduce or stop promotion for that product or collection. The distinction matters: a SKU can retain positive gross profit while paid acquisition consumes the remaining contribution. A collection-level view can also reveal that one exposed product is dragging down an otherwise viable range.
For a complete operating decision, pair profitability with realized revenue, returns and inventory. Revenue should come from delivered orders, not cancelled or returned orders. Return rate and refund value show whether tariff pressure is being evaluated against revenue that the merchant actually keeps. Inventory position, dead stock and remaining stock value indicate whether the business should protect cash, sell through existing units or reassess future imports. ORVX reports these measures separately, keeps the merchant’s trading currency intact, and shows product- and collection-level profitability rather than revenue alone.
| Measure | What it is for | When to act on it |
|---|---|---|
| Tariff rate | Screens exposure by product or origin | Review classification, sourcing or origin assumptions |
| Duty dollars | Estimates the customs cash charge on an entry | Plan shipment cash and compare import scenarios |
| Landed product cost | Connects import cost to unit economics | Review price, pack size or sourcing |
| Gross margin | Shows product economics before advertising | Assess whether the SKU is viable before promotion |
| Contribution after advertising | Shows what remains after paid acquisition | Scale, reduce, test or stop promotion |
| Realized profitability plus inventory | Combines delivered revenue, returns and stock exposure | Prioritize sell-through, assortment or capital decisions |
General information only: tax, duty and import rules change and depend on your situation, so check with an accountant or the official source before acting.