How to stress-test China landed costs
Freeze a documented baseline, change each uncertain input separately, then combine credible adverse changes. Recalculate cost per sellable unit and margin at your planned selling price. Find the freight, currency and usable-quantity limits that erase your margin. Review the assumptions with Cambridge China Bridge.
Freeze the baseline and define failure
Build your starting model using Understanding your landed price. Save the supplier quotation, buyer-supplied freight quotes, payment currencies, ordered quantity, expected sellable quantity and verified tariff inputs beside it. Mark each input as confirmed, estimated or unresolved, with its source and review date.
Keep your planned selling price and selling costs fixed during the initial tests. Define margin as net sales revenue less landed cost and the selling costs you have included. Record both the minimum margin you require and the point where that margin disappears. Keep cash required before sales in a separate output. For channel buying limits, see target landed costs for wholesale and retail.
Test each input while preserving its effects
Reset to the baseline before changing each input. Use buyer-supplied freight quotes with matching shipment details and delivery scope; list exclusions separately. Use payment-provider quotes or buyer-approved currency assumptions, and inspection or previous-batch evidence for usable quantities. Label unsupported adverse assumptions as stress cases, rather than forecasts.
Hold unrelated inputs fixed, but let dependent calculations update. Freight to the UK border enters customs value, so a freight change can also change duty. Keep payment conversion separate from customs conversion; ask your customs broker to confirm the applicable customs exchange rate and whether any contractual rate can be used. See customs value and exchange-rate budgeting.
| Input | Change | Recalculate |
|---|---|---|
| Freight | Replace the quote and its excluded charges | Transport cost, customs value and affected duty |
| Payment exchange rate | Change conversion for unpaid foreign-currency amounts | Goods and other exposed payments in sterling |
| Customs exchange rate | Change the declaration conversion assumption | Customs value and affected duty |
| Usable quantity | Reduce units available for sale | Cost per sellable unit and net sales revenue |
| Verified tariff inputs | Substitute a documented applicable alternative | Duty using its verified calculation basis |
Verify tariff alternatives before modelling them
The UK Trade Tariff service helps you find a commodity code. Ask your customs agent to document the product description, origin, intended import date, applicable duty calculation and any additional measures used in your model. A guessed rate is an unresolved assumption. Use finding your commodity code to prepare the product details.
Do not choose a different code because it produces a better margin. Where classification or measure coverage remains unresolved, show separately documented alternatives and obtain clarification before committing. Anti-dumping duty is charged in addition to other applicable duties. Check the relevant scope with trade-remedy duty checks, rather than assuming ordinary duty is the whole bill.
Combine credible adverse changes
Create a combined case using higher freight, less favourable payment conversion, lower usable quantity and the applicable verified tariff case. Describe why those assumptions could occur together. Keep paid or contractually fixed amounts unchanged. Avoid combining incompatible shipping quotes or tariff alternatives into a result that could never describe your order.
Recalculate the complete model rather than adding the separate margin losses. Higher freight can increase the duty base while fewer sellable units spread the remaining cost more thinly. Add documented sorting, rework or disposal costs where relevant. Do not reduce the purchase bill merely because fewer units are usable, or assume a supplier refund that has not been agreed.
Find the limits and make the commitment decision
Starting from the baseline, move each uncertain input towards an adverse value until your required margin is breached, then until margin disappears. Record the maximum affordable freight bill, least favourable affordable payment rate and minimum usable quantity. For tariff inputs, compare the verified alternatives rather than inventing intermediate rates. Repeat the limit search with the other adverse assumptions already in place.
Rank assumptions by their margin impact over the ranges you actually tested, and record the remaining headroom. Attach an action to each fragile assumption: refresh freight, agree payment terms, obtain quality evidence or resolve tariff treatment. Commit only when the downside and cash requirement fit your buying limits; otherwise change the order, selling price or timing and rerun the model. To compare the import option with domestic buying, see UK wholesale prices versus China landed costs.
Frequently asked questions
What freight quote should I use for a stress test?
Use buyer-supplied quotes for the same shipment and delivery scope. Record expiry, currency, exclusions and destination charges. Keep a clearly labelled adverse assumption if no comparable alternative quote is available.
Should I use my bank rate or the HMRC rate?
Use your payment-provider rate for payment exposure. Ask your customs broker to confirm the applicable customs exchange rate and whether any contractual rate can be used. Keep these inputs separate and test their effects separately.
How do I allow for defective units?
Reduce the quantity available for sale while retaining the committed purchase cost. Add relevant sorting or rework costs. Use batch evidence where available and show uncertain usable quantities as stress assumptions.
How do I know which assumption could erase my margin?
Find each input's limit at your planned selling price, then repeat with other adverse changes in place. Compare those limits with documented quotes and batch evidence. An unresolved tariff input needs clarification before commitment.