A tariff clause in a supplier contract states who pays when duty rates change between signing and delivery: buyer, seller, or a split, sometimes with a threshold or a right to renegotiate. Without one, the importer of record usually bears the full change by default, whatever the sales conversation assumed.
Why this conversation belongs in the contract
Duty risk used to be background noise: rates moved rarely, so contracts ignored them and nobody paid for the omission. In a period of frequent tariff actions, that silence is an unpriced bet placed by whichever side the default rules happen to favor.
For more on this, see this related guide and our earlier explainer on the same theme.
A tariff clause does not eliminate the cost. It decides, calmly and in advance, whose cost it is and what happens next. That certainty is worth real money to both sides when a rate moves thirty days before a large shipment lands.
The main clause designs
Simplest is a fixed allocation: buyer bears all changes, or seller delivers duty paid and bears them. Next is a banded split, where small moves sit with the buyer and large moves are shared by formula. Most flexible is a renegotiation trigger, where a move beyond the band opens a defined process with deadlines and a termination right if talks fail.
Each design prices differently. A seller bearing tariff risk will charge for it, openly or inside the unit price. Compare the premium to your own cost of bearing the risk rather than assuming shifting it is free.
Details that decide whether clauses work
Define the trigger precisely: which duty types, measured against which baseline date and rate, applied to which shipments. Vague clauses about tariff increases invite the argument they were meant to prevent, especially when old and new actions overlap on the same code.
Readers also found this companion piece from our archive useful.
Add notice duties and evidence. The party claiming a change should have to share the official notice and the entry documentation showing the rate actually paid. Clauses run on documents, not on news links and recollections.
Negotiating before you need it
Raise tariff clauses at signing and renewal, framed as fairness for both sides: the clause that protects you from a rate rise protects the supplier from being forced to absorb one in silence until they fail to perform. Suppliers prefer a defined split to a desperate mid shipment phone call.
Keep a register of which contracts have which clause. When a new tariff action lands, that register is the difference between an afternoon of checking a list and a week of reading every agreement you own.
Frequently asked questions
Who pays a new tariff if the contract says nothing?
Legally, the importer of record owes customs the duty. Between buyer and seller, silence usually means the buyer absorbs it within the agreed price, unless the delivery term or other wording shifts it. That default surprises one party in almost every dispute.
What is a change in law clause?
It is a contract provision covering government changes after signing, including tax and duty changes, that sets out who bears the cost or how the parties will renegotiate. Tariff specific clauses are a narrower, clearer version of the same idea.
What threshold makes sense in a tariff clause?
Many contracts trigger sharing only when the rate moves beyond a small band, like two to five points, so normal noise stays with the buyer while large shocks are shared or renegotiated. The right band depends on margin and volatility in your category.
Should we add tariff clauses to existing contracts?
At renewal or amendment, yes, and the conversation is easier when no change is pending. Mid crisis amendments happen too, but both sides negotiate harder when a specific shipment cost is already on the table.