International Contracts: Drafted, Reviewed, Translated and Certified for Use in Thailand and Abroad

What Makes a Contract International

A contract is international when the parties are based in different countries, or when goods, payment or performance cross a border. Common examples in Thailand include export and import sales agreements, distribution and agency agreements, service agreements with overseas clients, trademark or software licences, joint venture agreements and consultancy agreements with foreign advisers.

The key difference from a domestic contract is that more than one legal system may apply. If the contract is silent, a court or tribunal must first decide which law governs, which costs time and money and may produce a result neither party expected. In Thailand the choice-of-law rules are found in the Conflict of Laws Act B.E. 2481 (1938), which generally respects the law the parties have chosen.

Enforcement matters just as much. A foreign court judgment is not automatically enforceable in Thailand. By contrast, an arbitral award made in a New York Convention state can be enforced through a Thai court under the Arbitration Act B.E. 2545 (2002), because Thailand is a party to the 1958 Convention. That difference strongly shapes the choice of dispute resolution.

Essential Clauses in a Cross-Border Contract

• Governing law — name one legal system and check that both sides can obtain advice on it.
• Dispute resolution — which court, or which arbitral institution, seat, language and number of arbitrators.
• Prevailing language — in a bilingual contract, state which version controls if the texts differ.
• Scope, price, currency and exchange-rate risk, withholding tax and who bears it.
• Delivery terms (for example Incoterms 2020), the point at which risk passes, and the trade documents required.
• Force majeure, termination rights, liquidated damages and limitation of liability.
• Confidentiality, intellectual property and, where personal data leaves Thailand, compliance with the PDPA.
• Notices — valid addresses, accepted email addresses and when electronic notice takes effect.

Bilingual Thai–English Contracts: Benefits and Traps

A bilingual contract lets the Thai party genuinely understand the terms, reducing later arguments that the language was not understood. It also helps when the contract must be filed with Thai bodies such as the Department of Business Development, the Board of Investment, the Land Department or a Thai court, all of which work in Thai.

The most common trap is mismatched key terms. Words such as 'indemnify', 'best efforts', 'consequential loss' or 'termination for convenience' have no single Thai equivalent for every context, and a literal translation can change the legal effect. A translator who understands both legal systems should review the text, and key terms should be pinned down in the definitions clause.

If no prevailing language is stated and the Thai and English versions conflict, a court may have to infer intent from other evidence, making the outcome hard to predict. The safer approach is to choose one controlling language and describe the other as a convenience translation.

Court or Arbitration: How to Choose

Choosing Thai courts suits deals where the other party's assets are in Thailand, because judgments can be enforced directly. A foreign court may be convenient for the foreign party, but if enforcement against Thai assets is needed, a foreign judgment generally cannot be enforced as such; a fresh claim in Thailand may be required, using the judgment as evidence.

Arbitration is popular in international contracts because it is confidential, lets the parties choose expert decision-makers, and produces awards enforceable across New York Convention states. Institutions frequently used include the Thai Arbitration Center (THAC), the Thai Arbitration Institute (TAI), SIAC and the ICC. Some disputes, such as those involving state contracts, may face specific restrictions under Thai law.

Draft the clause using the chosen institution's model wording, stating the seat, language and number of arbitrators. Ambiguous clauses, for example ones naming both courts and arbitration without saying how they interact, are a leading cause of satellite disputes over jurisdiction.

Signing, Notarisation and Using the Contract Abroad

In Thailand most contracts take effect on agreement, and electronic signatures are recognised under the Electronic Transactions Act B.E. 2544 (2001). Some contracts, however, must follow a prescribed form, such as sales of land or leases of immovable property over three years, which must be registered with the competent official. Many receiving authorities also still require wet-ink signatures with certification.

When a contract or power of attorney will be used overseas, the destination often requires the signature to be certified by a Notarial Services Attorney, followed by legalisation at the Department of Consular Affairs of the Ministry of Foreign Affairs and at the destination country's embassy. Thailand has acceded to the Apostille Convention, but it enters into force for Thailand on 28 February 2027; until then, the traditional legalisation chain still applies.

In the other direction, a contract signed abroad for use in Thailand, for example for filing with the Department of Business Development, usually needs certification by a foreign notary, legalisation at the Thai embassy in that country, and a certified Thai translation. Always check the receiving authority's requirements before signing.

Contract Types We See Most Often

Distribution and agency agreements: the key issues are exclusivity, territory, minimum purchase targets, termination notice, and what happens to stock and customer data when the relationship ends. Foreign principals should also check whether the Thai partner's role triggers foreign business licensing rules.

Service and software agreements with overseas clients: Thai service providers should focus on payment security, withholding tax under the relevant double tax treaty, limits of liability, ownership of deliverables and data transfer obligations under the PDPA.

Joint ventures and shareholder agreements: these must align with the Thai company's articles of association and the Civil and Commercial Code, as well as foreign ownership limits under the Foreign Business Act. A shareholder agreement that conflicts with the registered articles may be difficult to enforce against the company.

Licensing of trademarks and technology: registration of the underlying rights in Thailand, royalty structures, quality control and the tax treatment of royalties all need attention before signing.

Supply and manufacturing agreements: specifications, inspection, warranty periods, product liability and Incoterms allocation are where most disputes start, so they deserve precise drafting.

How We Work

• Intake: parties, countries, goods or services, value, duration and the authority where the contract will be filed.
• Review of your existing draft or preparation of a new one, with a clause-by-clause risk summary and proposed changes.
• Bilingual drafting with a consistency check on legal terminology in both languages.
• Support in negotiating amendments on your instructions.
• Coordinating signing, signature certification, certified translation and consular legalisation for the destination country.

Common Mistakes

• Using an online template governed by a foreign law that nobody on the team knows.
• Leaving out a prevailing-language clause in a bilingual contract.
• Choosing a foreign court although the counterparty's assets are in Thailand.
• Overlooking withholding tax and double tax treaties, so net income is lower than expected.
• Discovering after signing that the receiving authority needed certified signatures or translations, forcing a re-signing.

Our Role

We draft, review, translate and certify contract documents for use in Thailand and abroad. Where a point needs advice under foreign law, we will flag it and recommend involving a lawyer qualified in that country.

Negotiation and dispute outcomes depend on the facts and on the other party. We cannot promise any particular result.

Frequently asked questions