Sales and Purchase Contracts: International Trade Essentials

The sales contract is the workhorse of commercial law — the document under which most physical goods move between businesses. Whether you call it a purchase agreement, supply contract, or order form, the legal structure is essentially the same. This guide is part of our master series on business agreements.

What is a sales contract?

A sales contract is a legally binding agreement in which the seller agrees to transfer ownership of specified goods to the buyer, and the buyer agrees to pay the agreed price. It is distinct from a service contract, which governs the performance of work rather than the transfer of goods.

In practice, the sales contract may take many forms — a master purchase agreement covering multiple shipments, individual purchase orders under standard terms, a one-time bespoke contract for a major asset sale. The legal structure is similar across all of them.

What governs cross-border sales between businesses?

For commercial sales of goods between parties in different countries, the United Nations Convention on Contracts for the International Sale of Goods (CISG) often applies automatically unless the contract explicitly excludes it. Roughly 95 countries have ratified the CISG, including most major trading nations.

Whether to apply or exclude the CISG is one of the most important drafting choices in cross-border deals. The CISG creates a uniform framework that reduces dependence on either party’s national law; on the other hand, it has its own quirks — particularly around remedies and inspection periods — that may not suit every transaction. Many large companies routinely exclude the CISG and apply a chosen national law instead. Whatever the choice, it should be made deliberately, not by default.

What clauses must every sales contract include?

A standard sales contract contains ten clauses covering identification, price, delivery, risk, ownership, and remedies.

1. Identification of goods — quantity, specification, quality standards, packaging, labelling.
2. Price and payment terms — total price, currency, payment schedule, advance payments, security (letters of credit, bank guarantees).
3. Delivery — date or schedule, delivery point, mode of transport, partial deliveries.
4. Incoterms — internationally standardised allocation of transport, insurance, customs, and risk.
5. Title and risk transfer — exact moments when ownership and risk pass to the buyer.
6. Inspection and acceptance — buyer’s right to inspect, time window, consequences of non-conformity.
7. Warranties — express warranties on quality and fitness; treatment of implied warranties.
8. Remedies for non-conformity — repair, replacement, price reduction, refund, damages.
9. Force majeure — events that excuse non-performance.
10. Governing law and dispute resolution — including explicit treatment of the CISG.

How do Incoterms allocate risk and cost?

Incoterms, published by the International Chamber of Commerce, are standardised three-letter codes that define which party is responsible for transport, insurance, customs, and risk during shipment. The 2020 edition is the current standard. Choice of Incoterm dramatically affects total landed cost and insurance arrangements.

When does title to the goods transfer?

Title transfer is separate from risk transfer. Risk usually passes when the goods are delivered to the carrier at the named delivery point; title may pass at a different moment — most commonly on full payment.

Sales of high-value goods on credit terms often include a retention of title (Romalpa) clause stating that ownership remains with the seller until the price is fully paid. This protects the seller in the buyer’s insolvency: even if the buyer files for bankruptcy holding unpaid goods, the seller can usually recover them as their property. Retention of title clauses must be drafted carefully to be effective in the relevant insolvency jurisdiction.

How should warranties and remedies be structured?

Sales contracts typically combine express warranties (specific commitments by the seller) with treatment of implied warranties (those imposed by statute). The remedy structure defines what the buyer can do if the goods do not conform.

• Express warranties — specific commitments: conformance with specification, no defects in materials and workmanship, period (e.g., 12 months from delivery), and remedy hierarchy (repair → replacement → refund).
• Implied warranties — under most jurisdictions, goods come with implied warranties of merchantability and fitness for purpose. These can usually be excluded by clear contract language in B2B sales, but exclusion is harder in consumer sales.
• Remedy hierarchy — most contracts give the seller the first opportunity to repair or replace, with refund as a last resort. Buyers benefit from clearly defined time windows for seller response.

What are the most common drafting mistakes in sales contracts?

Five mistakes recur most often in our review work on sales contracts.

1. No or wrong Incoterm — without an Incoterm, allocation of delivery cost and risk is ambiguous and may default unfavourably under the chosen law.
2. Implicit CISG application — failing to address the CISG explicitly means a court determines its application later, often during litigation.
3. Vague quality specifications — “good quality” or “industry standard” without measurable criteria invites disputes.
4. No inspection window — without a defined inspection period, the buyer may lose the right to reject defective goods after a “reasonable time” that is unclear in advance.
5. Weak retention of title — generic clauses that do not match local insolvency law often fail when most needed.

Frequently Asked Questions

Quick answers to the most common questions readers ask about this topic.