When a tariff lands mid relationship, neither the brand nor the supplier caused it, and both feel they should not pay it alone. Cost sharing deals work when they are formula based, time boxed, and tied to the actual duty paid.
A new tariff usually arrives between orders, on goods priced months earlier under a different cost structure. The brand points at the supplier price. The supplier points at the importer's legal duty to pay customs. Both are describing the same bill and hoping the other side absorbs it.
Ad hoc settlements make it worse. A discount given on one order becomes the expected baseline for the next, while the actual duty varies by classification, value, and any exclusions in force. Within a quarter, neither side can say what was agreed, and every purchase order reopens the fight.
The durable deals share the assessed duty, not a guessed percentage of price. Common forms: the supplier cuts the unit price by an amount equal to an agreed share of the duty per unit, the brand absorbs the rest in margin or price, and both sides see the entry summary figures the split is calculated from.
Time boxing is what makes suppliers sign. A sharing formula tied to a named tariff action, reviewed on a set date or when the rate changes, is a bridge both sides can cross. An open ended promise to share future unknown duties is a blank check neither side should write.
Name the products, the tariff line, and the calculation: duty assessed per unit, the share each side bears, and how currency and freight changes are treated so the formula does not quietly double count them. State what happens if an exclusion is granted, a rate falls, or goods are reclassified, because each of those changes the bill the formula divides.
Include the evidence flow. The brand, as importer, holds the customs records, so the deal should say when entry data is shared and how either side can check the math. Sharing arrangements collapse on suspicion faster than on cost, and shared numbers are the cheapest trust available.
Sometimes the better answer is not dividing the duty but shrinking it. Suppliers can help with tariff engineering input, alternative materials, or production shifts that change classification or origin, and those moves often save more than any split. A cost sharing conversation is the right moment to price those options together.
Brands can also share the burden with the customer instead of only with the supplier: a modest price rise, a surcharge shown honestly at checkout, or a smaller pack at the old price. The right mix depends on how price sensitive the product is, but deciding deliberately beats letting margin absorb the whole shock by default.
If a supplier will not share any of a sudden, large duty and the product cannot carry it at any workable price, the honest conclusion is that the product, as sourced, no longer works. Renegotiating forever while losing money on every unit is not loyalty. It is a slow write off.
Document the landing either way. A signed sharing formula, or a decision to exit a product with notice and a sell through plan, both protect the relationship and the balance sheet. The worst outcome is the unwritten understanding each side remembers differently at the next order.
Keep reading: How do country of origin rules change when a product is assembled in a third country?, How does tariff engineering work, and where is the legal line?, and How do Section 301 tariff exclusions work, and when is filing worth it? cover the nearby cases in this series.
The importer of record owes the duty to customs, which for most DTC brands is the brand itself. Splitting the cost with a supplier is a commercial agreement about who ultimately bears it, not a change to the legal obligation.
Better to split the duty actually assessed per unit. Price percentages drift away from the real bill as rates, values, and classifications change, while the assessed duty is a checkable number.
Tie it to the tariff action and set a review date or a rate change trigger. Open ended sharing of unknown future duties is a commitment neither side can price responsibly.
Price the alternatives honestly: engineering or sourcing changes, customer facing price moves, or exiting the product. A refusal is information about the product's viability at the new rate, not just a negotiating position.