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CISG: When the UN Sales Convention Applies to Your Export Contract and What to Put in It

The CISG (UN Convention on Contracts for the International Sale of Goods, Vienna 1980) is a uniform sales law in force in 97 States, including China, the United States, Germany, Japan, the Republic of Korea, Viet Nam, Brazil, Türkiye and, since 1 September 2024, Saudi Arabia; the United Kingdom and India are not parties. It applies automatically to a sale of goods between businesses located in two different contracting States, unless the contract excludes it, and it covers how the contract is formed and the rights and obligations of seller and buyer: delivery, conformity of the goods, risk, remedies and damages. Incoterms rules written into the contract take precedence over the CISG on the points they cover.

Checked against official sources: 2026-10

At a glance

Full nameUnited Nations Convention on Contracts for the International Sale of Goods (Vienna, 1980)
Parties97 States (UNCITRAL status page, October 2026)
Not parties (examples)United Kingdom, India, Indonesia, United Arab Emirates, Bangladesh, Pakistan, Thailand, Malaysia
Applies whenSeller and buyer have their places of business in different contracting States (Art. 1(1)(a)), unless excluded (Art. 6)
Not forConsumer sales, auctions, securities and money, ships and aircraft, electricity (Art. 2)
FormNo written form required (Art. 11), unless a party's State made an Article 96 declaration
DefectsNotice within a reasonable time after discovery, and at the latest two years after the goods were handed over (Art. 39)
ImpedimentsA party is not liable in damages for a failure due to an impediment beyond its control (Art. 79)

When the CISG applies to your sale

The CISG applies to contracts for the sale of goods between parties whose places of business are in different States when both States are contracting States (Article 1(1)(a)). For example, a Korean exporter selling to a buyer in Germany, the United States or Viet Nam is usually under the CISG unless the contract says otherwise. It can also apply when the rules of private international law lead to the law of a contracting State (Article 1(1)(b)), but China, the United States and Singapore have declared under Article 95 that they are not bound by that rule.

The CISG does not apply to goods bought for personal, family or household use, sales by auction or on execution, stocks, securities, negotiable instruments or money, ships, vessels, hovercraft or aircraft, and electricity (Article 2). It does not deal with the validity of the contract or with the property in the goods, which remain under national law. The parties may exclude it entirely or vary its provisions (Article 6), for example by writing "The United Nations Convention on Contracts for the International Sale of Goods shall not apply"; choosing "the law of" a contracting State without excluding the CISG usually brings the CISG in, because it is part of that State's law.

Offer, acceptance and the proforma invoice

Conformity, notice of defects and risk

Remedies, damages and force majeure

What to put in the sales contract

Whether the CISG applies or not, write down the points it leaves to the parties: the goods and specifications, quantity and tolerance, price and currency, Incoterms rule and named place with "Incoterms 2020", delivery date, payment terms and documents, inspection and the period for notice of defects, packaging and marks, warranty, limitation of liability, force majeure, governing law (and whether the CISG applies or is excluded) and dispute resolution. Triplicate's sales contract template and generator include most of these headings, from the goods, price, Incoterms rule and payment to packing, insurance, documents, quality claims, force majeure and disputes, so the proforma invoice, commercial invoice and contract all match.

Step by step

  1. Check whether both countries are CISG contracting States on the UNCITRAL status page.
  2. Decide whether to keep the CISG or exclude it expressly, and write the governing law clause accordingly.
  3. Make the offer definite: goods, quantity and price, with an Incoterms rule and payment terms.
  4. Set inspection and defect-notice periods and a force majeure clause in the contract.
  5. Have both parties sign the contract or confirm the proforma invoice in writing.

Documents you usually need

Common problems and how to avoid them

The contract says "governed by the laws of Korea" and the seller assumed only the Korean Civil Act applied.

What to do: Korea is a CISG contracting State, so the CISG applies to an international sale unless the contract excludes it expressly.

The buyer's purchase order changes the delivery date and payment terms of the proforma.

What to do: Under Article 19 those are material changes, so the order is a counter-offer. Confirm the final terms in writing before shipping.

The buyer complains about defects 30 months after delivery.

What to do: Under Article 39 the buyer loses the right to rely on a lack of conformity if it gives no notice within two years of the goods being handed over, unless the contract sets a longer guarantee period.

A sale to a buyer in the United Kingdom is assumed to be under the CISG.

What to do: The UK is not a contracting State; the governing law clause and English or other national law decide. State the governing law in the contract.

Sources

  1. Status: United Nations Convention on Contracts for the International Sale of Goods (Vienna, 1980) United Nations Commission on International Trade Law (UNCITRAL)
  2. Text of the Convention (CISG) CISG-online, University of Basel

Rules change often. This note is practical guidance based on the sources above, not legal advice. Confirm current requirements with the authority, your importer or a licensed customs broker before you ship.

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Common questions

What is the CISG?

The United Nations Convention on Contracts for the International Sale of Goods (Vienna, 1980), a uniform law for international sales of goods between businesses, in force in 97 States.

Does the CISG apply automatically?

Yes, to a sale of goods between businesses in two different contracting States, unless the contract excludes it. Choosing the law of a contracting State without excluding the CISG usually brings it in.

Which countries are not parties to the CISG?

Among others, the United Kingdom, India, Indonesia, the United Arab Emirates, Bangladesh, Pakistan, Thailand and Malaysia were not parties in October 2026. Check the UNCITRAL status page for current information.

How do I exclude the CISG?

State it expressly, for example: "The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this contract", and name the national law that applies instead.

Do Incoterms override the CISG?

On the points they cover, yes: an Incoterms rule agreed in the contract sets delivery, risk transfer, costs and export and import clearance, while the CISG continues to govern other matters such as conformity and remedies.

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