Shipping from Canada to the US: calculate your shop’s full cost

A cheap label and an expensive delivered order can coexist. The label buys a transport service; it does not necessarily include the charge for customs handling, the amount advanced to customs or the labor needed to pack. Once you stop treating “shipping” as one number, it becomes easier to see whether the problem is the carrier, the product’s tariff treatment or the way you fulfill orders.

This worksheet is for Canadian shops selling to American customers. Prices and official guidance were checked on October 14, 2026. Insert your own quotes and product costs into the formulas; the worked AirPost comparison below uses published starting amounts and makes no claim about a shop’s actual volume or savings.

Which costs belong in the direct-shipping total? #

Define direct fulfillment cost as T + D + C + P + H. T is the complete transport quote, including identified surcharges. D is the applicable import assessment. C is the operator’s clearance, remittance or advancement charge. P is packaging and H is your packing and dispatch cost. Keep product manufacturing or purchase cost separately if you are calculating the order’s full margin.

Do not add a charge twice because it appears both in a carrier breakdown and in your own estimate. Conversely, a line reading “customs included” needs interpretation: it might refer to routine clearance services rather than the duties themselves. Ask what is included, what is variable and who receives the final bill. Save the quote’s terms with its date.

Why can two identical Canadian parcels receive different assessments? #

The transport channel and the way preference is claimed matter. A product that qualifies for CUSMA treatment through a supported commercial entry is not automatically treated identically through international post. The Canadian government’s current tariff resource specifically warns about the postal distinction. Ask for an assessment for the service you will book, rather than carrying a courier assumption into a postal budget.

The same resource records a 10% Section 301 measure from July 24, 2026, 50% Section 338 measures on covered Canadian products from August 22, and changes allowing Section 338 to stack with Section 232 from September 15. These are reasons to check coverage and stacking, not percentages to add to every shop order. Some products can also face restrictions rather than a payable tariff alone.

Keep ordinary preference, additional measures and admissibility separate in the worksheet. Request the actual tariff provisions used and the basis for any exemption. If a product is not admissible through the intended route, the useful output is a stop decision, not an increasingly expensive cost calculation. Review the treatment when the product or rules change, even if you keep the same carrier.

Who pays when your checkout collects duties? #

Separate the commercial promise from the operational payment path. If your checkout collects import charges, record which service or provider receives them and which shipment they fund. If the receiver will pay through clearance, explain that arrangement before purchase. Neither the word “international” nor the existence of a customs form identifies the payer.

For Canada Post, the US business guidance describes its Zonos-based declaration and payment process. The published workflow distinguishes lower-value parcels from goods over US$800. Use the booking’s actual treatment in your checkout language. Do not claim that collecting an estimate through an unrelated storefront setting automatically satisfies the carrier process.

Reconcile the final assessment after dispatch. Retain the order amount, the amount collected at checkout and the carrier or declaration bill. This lets you identify whether a difference comes from currency conversion, product details or a separate operator charge. Your margin report should use the actual expense where known, rather than permanently retaining a pre-dispatch estimate.

How do you request carrier quotes that can be compared? #

Provide the same origin and destination postal information, the finished parcel’s measurements and the same commercial goods record to each provider. Identify any requested delivery features and the responsible importer. If one quote assumes electronically supplied customs documents while another requires a different document process, record the extra work as well as the transport charge.

FedEx Canada’s documentation requirements call for complete information on non-document shipments and describe electronic trade documents. That is an operational requirement, not merely optional administration outside your shipping cost. A cheaper quotation can create more work if your product descriptions, invoice or submission process are not ready for the selected service.

Compare the total quote and its exclusions, not just a discounted list price. Check which amounts are estimates, what triggers reassessment and whether the quote covers an actual postal destination. Keep quotations for different service levels separate. You cannot attribute a price difference solely to the carrier if one parcel is booked under different delivery or customs terms.

What changes in the equation when inventory is already in the US? #

For cleared American stock, define domestic fulfillment as L + S + P + B/N. L is the domestic label, S the sender compensation, P local materials and B the batch’s incoming transport, import and receiving costs. N is the number of shipped units to which those batch costs can reasonably be allocated. Add other actual expenses where they apply; a formula is only as complete as your records.

The useful break-even test compares that domestic total with your comparable direct total. If the direct total minus L, S and P is positive, dividing B by that difference gives an indicative number of shipped units needed to recover the batch cost. If the difference is zero or negative, increasing volume does not fix that particular cost comparison. Use the same currency throughout.

Use units expected to ship, rather than every unit sent into storage, when testing the commercial case. Stock remaining unsold still consumed part of the incoming shipment. Keep a cautious allocation alongside an optimistic one using your own sales evidence. This is especially useful when only a few variants sell regularly in the US and slower variants would tie up inventory there.

What does the AirPost price snapshot add to that calculation? #

The US-to-US page displayed a small-parcel USPS Ground Advantage starting amount of about US$7.78 and a FedEx Ground Economy starting amount of about US$8.22 on October 14, 2026. Subtracting the two gives US$0.44. Both displayed amounts already include the platform fee; the sender compensation you agree remains separate.

That narrow comparison tells you the difference between two published outbound starting amounts. It cannot tell you that either amount is available for every weight, ZIP pair or package, and it cannot establish the full B/N inventory allocation. The page uses converted estimates and states euro settlement. Preserve the quoted payment currency and conversion when putting the result into a CAD margin report.

The CA-to-US query fell back to a Canadian domestic selection when retrieved. We therefore have no measured AirPost southbound price to place beside these US labels. That missing comparison is part of an honest worksheet. Get a supported cross-border quote separately, and compare it with the complete local fulfillment arrangement, including the first stock import.

How do you keep the worksheet useful after the first shipment? #

Archive the estimate and replace its variable lines with actual charges as invoices arrive. Keep the parcel record connected to its product version and customs assessment. If the same product repeatedly differs from its estimate, inspect the classification, value and channel assumptions before simply raising every US shipping rate.

Review US fulfillment by product group. A mixed shipment can contain articles with different origins and treatment, while the transport quote covers the whole box. The US classification guide explains the product-code distinction, and the customs document workflow shows why a label is not the entire document set. Use those checks to trace which part of the total needs attention.