Short answer: Review shipping zones, delivery profiles, product weights and HS codes, and the duty and tax settings in your shipping apps every quarter. Rules moved in 2026: the US ended duty-free treatment for low-value parcels, the EU added a flat duty on low-value imports in July, and the UK is still debating its own threshold change. Settings written when the old thresholds applied now understate what the customer will pay.
Why a quarterly cadence
- Duty thresholds are policy, and policy moved three times in twelve months across the US, EU, and UK corridors.
- Carrier rules and surcharges drift too: fuel, remote-area fees, and brokerage minimums change without a big announcement.
- A quarterly slot, about an hour with your ops lead, catches drift before a busy season turns small mismatches into hundreds of misquoted orders.
1. Shipping zones and delivery profiles
- Open each market in Shopify Markets and confirm the zones still match where you actually sell. Markets added quickly for a promo often include countries your carrier cannot service at the quoted rate.
- Check delivery profiles for products added since the last review. New SKUs land in the default profile, which may not carry the right rates or the right duty handling for the lanes you serve.
- Confirm duties are set to be collected at checkout (DDP) in every market where you promised it. A zone added in a hurry often defaults to DAP, and customers get a collection request at the door.
2. Product data the duty math depends on
- Reconfirm HS codes on any SKU whose classification was a guess the first time. The July 2026 EU low-value duty made low-value classification accuracy matter more, not less.
- Verify country of origin on SKUs that changed suppliers or sourcing countries. An origin change resets the duty rate, and Shopify still uses the old value unless someone updates it.
- Check declared weights and dimensions on every product variant. Carriers increasingly audit declared weights, and underdeclared weights come back as adjustment invoices, not silent corrections.
3. Duty, tax, and shipping app settings
- If you use a duty and tax app, confirm its rule tables are current: low-value thresholds, product-identifier requirements, and any flat-rate duties introduced since the last review.
- Spot-check three recent cross-border orders against the app's estimate. Small consistent gaps usually mean an outdated table; large one-off gaps usually mean bad product data on that SKU.
- Review the checkout copy for duty disclosure. If the rules changed, the wording should too, especially in markets where the customer now pays more than the product price suggested.
A one-page checklist you can run in an hour
- All active markets in Shopify Markets, zones confirmed against carrier service maps
- New SKUs assigned to the correct delivery profiles
- Duty collection setting (DDP vs DAP) matches what checkout promises
- HS codes and country of origin verified for new or resourced SKUs
- Weights and dimensions current on all variants
- Duty and tax app rule tables updated to current thresholds
- Three recent orders spot-checked against the checkout estimate
- Checkout duty wording reflects the current rules
Questions buyers ask
How often should a Shopify brand review duty-related settings?
Quarterly is a practical cadence. Low-value thresholds and duty rules changed several times in 2026, and shipping rates, zones, and carrier rules drift between reviews.
What breaks first when de minimis rules change?
The checkout estimate. If duty and tax calculations still assume a threshold that no longer applies, the customer total understates the real landed cost and the support queue feels it first.