Incoterms define the allocation of costs, risks, and responsibilities between buyer and seller in international trade. They must be agreed before the contract is finalised, as they form a fundamental part of the contractual terms. Considering Incoterms early ensures clarity on delivery obligations, customs responsibilities, insurance, and transport costs. Selecting Incoterms after contract agreement or at order placement would create ambiguity and risk disputes. Ethical and responsible sourcing requires clear contractual definitions to prevent misunderstandings, ensure compliance, and fairly allocate risk in global supply chains.