Peak Season Shipping Maths Changed for Canadian Stores
Peak season planning usually means stock, ads and staffing. This year, for anyone shipping across the Canada and US border, landed cost is the variable that moved most. Duty free treatment for low value parcels is gone, two sets of tariffs landed in the last month, and the shipping deadlines that decide your cut-off dates are not published yet. Here is what is confirmed, what is not, and what to decide now.
Checked on 20 September 2026. Where an official source has not published something yet, this article says so rather than guessing.
What actually changed for cross-border parcels this year?
Three things, and together they change the maths on every international order you take this quarter.
- The US de minimis exemption ended. Duty free treatment for shipments under US$800 was suspended from 29 August 2025 and applies to all countries. Parcels that used to clear without duty now need proper entry.
- US Section 338 duties of 50% took effect on 22 August 2026 on specified Canadian-origin goods, covering categories including dairy, alcoholic beverages and motor vehicle products. A USMCA claim does not exempt a covered product.
- Canada's counter-tariffs took effect on 8 September 2026, at rates of 15, 25 and 50 percent across roughly C$27.6 billion of US goods, including steel, dairy, appliances, agricultural equipment, pulp and paper and electronics.
Note the direction of each. The first two raise the cost of what you ship to American customers. The third raises the cost of inventory you buy from American suppliers. Most merchants have modelled one and forgotten the other.
What does this do to your peak season margin?
It attacks it from both ends, which is why a September review matters more than usual.
| Where it hits | What changes | What to do before November |
|---|---|---|
| Outbound US orders | Duty now applies to low value parcels | Decide whether you collect at checkout or absorb it |
| Canadian-origin goods on the Section 338 list | 50% on top of the ordinary rate | Check classifications product by product |
| US-sourced inventory | Counter-tariffs of 15 to 50% | Reprice or resource before peak buying |
| Free shipping thresholds | Were set when duty was zero | Recalculate, or they now quietly lose money |
| Returns | Duty is generally not recovered on a return | Model the true cost of a returned cross-border order |
The free shipping threshold is the one we see most often. A C$75 threshold set in 2024 assumed a parcel crossed the border for nothing. On a US-bound order that now carries duty and formal entry, that same threshold can turn a modest order into a loss.
Should you collect duties at checkout or absorb them?
Decide deliberately, because doing nothing is itself a choice and it is usually the expensive one.
Collecting at checkout shows the customer the full landed cost and prevents refused deliveries. It also raises the visible price at the moment of purchase, which costs you some conversion during the most competitive weeks of the year.
Absorbing the duty keeps the checkout price clean and moves the cost into your margin. That is defensible on high margin products and dangerous on thin ones, especially on categories carrying the new 50% rate.
Doing nothing means the customer meets a charge at the door. During peak season that produces refused parcels, chargebacks and a support queue you cannot staff. If you make one change this month, make it this one. We covered the mechanics in why your checkout charges the wrong duties.
How do you explain a duty charge to a customer?
Badly handled, this becomes your most expensive support conversation of the season. Well handled, it is a differentiator.
What works, in order of impact:
- Say it before checkout, not at it. A line on the product page for international destinations costs you nothing and removes the nasty surprise at the last step.
- Use plain words. Most shoppers do not know what de minimis means, and they do not need to. "Import duty is included in this price" or "customs charges may apply on delivery" is enough.
- Put it in the order confirmation email too. The gap between buying and delivery is where anxiety builds, and a customer who was told twice rarely opens a dispute.
- Train whoever answers messages on one script for the question, so five different answers do not go out in a week.
The stores that get complaints are not the ones charging duty. They are the ones where the charge appeared without warning, which reads to the customer as a hidden fee rather than a government one.
When are the 2026 holiday shipping deadlines?
Canada Post has not published its 2026 Christmas deadlines yet. Historically these appear in November, and several third-party sites are already circulating dates that appear to be last year's. Do not build your cut-off communications on those.
What you can plan around now:
- Christmas Day 2026 falls on a Friday, which compresses the final delivery week compared with a mid-week Christmas
- Cross-border parcels need more buffer than domestic ones this year, because formal customs entry replaced the express lane for low value goods
- Publish your own cut-off dates earlier than the carrier's, and keep a day or two in hand for clearance delays
Set a reminder to check Canada Post's official calendar in early November and update your banners then, rather than committing now to a date you cannot verify.
One more scheduling point specific to this year. If a meaningful share of your orders cross the border, work backwards from clearance rather than from transit time. A parcel that would have moved in three days under the old low value rules can now sit waiting on entry paperwork, and that delay lands precisely in the week where a late gift becomes a refund request.
Is Canada Post reliable for this peak?
More stable than last year, but not risk free. The labour dispute that disrupted the 2025 season is resolved: CUPW members ratified agreements on 1 June 2026, running to 31 January 2029, and the deal includes a weekend parcel delivery model.
The financial picture is still difficult, with reported quarterly losses through 2026, and that is the kind of pressure that produces service changes rather than strikes. The sensible posture is not to avoid Canada Post, it is to avoid depending on any single carrier for your peak volume.
Worth knowing if you are considering Shopify's Managed Markets for international orders: Canadian stores can only buy DHL Express and FedEx labels through it, and Canada Post is not available. That is a real constraint on your shipping mix, covered in our Managed Markets guide for Canada.
What about carrier surcharges this season?
Peak surcharges are normal, they usually run from late October into January, and they apply to residential and oversize parcels in particular. We are not quoting figures here because we could not confirm 2026 amounts on the carriers' own pages, and third-party summaries at this time of year tend to recycle last season's numbers.
The action is simple: ask your account manager for your 2026 peak surcharge schedule in writing this month, and put those numbers into your shipping calculator before you set free shipping thresholds for November.
What should you do in the next two weeks?
- Audit HS codes and country of origin on your top-selling products, since these now drive a 50% decision on some Canadian goods
- Recalculate free shipping thresholds with duty included in the landed cost model
- Choose your duty approach and implement it, rather than leaving customers to meet charges at the door
- Reprice or resource US-sourced inventory affected by the September counter-tariffs before peak buying
- Request peak surcharge schedules from every carrier you use
- Diarise early November to publish cut-off dates once Canada Post confirms its calendar
Where does this leave smaller stores?
In a better position than they think, provided they act early. Large retailers absorb tariff costs across huge volume and compete on price. A smaller brand cannot win that fight, but it can win on clarity: an accurate landed cost at checkout, honest delivery dates, and no surprise charges at the door. In a season where plenty of shoppers will get an unexpected customs bill from somebody else, being the store that told the truth is a real advantage.
For the wider market picture, see our analysis of US and Canada ecommerce data for 2026.
Get your peak season setup reviewed
Free review. Email hello@exactwhy.com with subject "Peak season" and tell us your store URL, which countries you ship to and your current free shipping threshold. We will tell you where your landed cost model breaks and what to change before November. We respond within 4 hours.
Prefer a form? Send it through the contact page instead. It reaches the same inbox.
The stores that struggle in December are usually the ones that set their shipping rules in a different tariff environment and never revisited them. Two hours of arithmetic now is worth more than any campaign you run in November.
Tariff dates verified against Canada's Department of Finance announcements and US trade advisories. Canada Post labour agreement details from CUPW, June 2026. Canada Post 2026 holiday deadlines and 2026 carrier peak surcharge amounts were not published on official sources at the time of writing and are deliberately not stated here.