Short Answer
First read the contract’s own language-priority clause.
Thai Civil and Commercial Code section 14 provides a default rule where a document is made in several languages including Thai, the texts differ and the parties’ intention as to which language should govern cannot be determined: in that situation, the Thai text prevails.
That means the familiar statement that “Thai always wins” is too broad.
But the opposite assumption is also dangerous. If the contract expressly says that one language controls, material protections negotiated into the other language should not be left inconsistent on the theory that the priority clause will solve the problem later.
A prevailing-language clause is a dispute rule—not a substitute for matching drafts.
Why This Matters
Bilingual contracts are often negotiated asymmetrically.
One side works mainly from English while the other side marks the Thai version. During several rounds of revisions, a new termination right, liability protection or payment condition can be inserted in one language but not carried through accurately to the other.
Everyone may still believe the commercial deal has been agreed.
The source behind this note involved exactly that risk: material protections were introduced in one language while the parallel language retained earlier wording, and the contract’s priority clause pointed to the other language. The final executed version and any dispute outcome were not available. fileciteturn7file2L33-L35
Typical Scenario
A commercial agreement is drafted in Thai and English.
During negotiation, the English version is revised to add a major protection for one party. The Thai version is not updated consistently.
The contract says the Thai text prevails if the two versions conflict.
Management signs off after reviewing only the English mark-up.
Which bargain has the business actually signed?
Practical Analysis
01Identify the controlling-language clause before reviewing amendments.
If the contract expressly states that Thai or English prevails in the event of inconsistency, every material edit should be checked against that clause.
A reviewer should not approve a commercial point merely because it appears in the non-controlling version.
02Understand section 14 as a default rule.
Section 14 applies where a document is executed in multiple languages including Thai, the texts differ and the parties’ intention about the governing language cannot be ascertained.
In that situation, Thai governs.
If the contract itself clearly states which language prevails, that clause is important evidence of the parties’ intention and the section 14 default should not be described as though it automatically overrides the agreed priority.
03Check governing law separately.
The language clause and governing-law clause answer different questions.
A contract can, for example, choose English as its controlling text while selecting Thai law to govern interpretation and remedies. If foreign law governs, its treatment of the priority clause also needs to be considered.
04Reconcile concepts, not only sentences.
Legal drafting rarely maps word-for-word across languages.
The review should test whether the same commercial effect appears in both texts: trigger, condition, time period, remedy, carve-out and responsibility.
05Pay special attention to later mark-ups.
The highest-risk discrepancies often arise after the first translation, when a commercial team revises only the language in which negotiations are being conducted.
Use a bilingual issue list for every material amendment.
06Do not wait for litigation to translate the bargain.
A prevailing-language clause can help resolve a conflict, but discovering at dispute stage that the signed texts contain different remedies is already a transaction failure.
What We Usually Look At
We review the controlling-language clause, governing law, dispute forum, both executed texts, material negotiation mark-ups and any clause involving price, commencement, termination, liability, indemnity, guarantees or conditions precedent.
Common Traps
Typical mistakes are saying “Thai always prevails,” approving only the English redline, assuming translations remain aligned after late negotiation and confusing the governing language with the governing law.
Practical Next Step
Before signature, prepare a short reconciliation table:
commercial point → Thai clause → English clause → same legal effect? → controlling language → final correction
Do not sign until every material row reads consistently.
Legal Sources
- Thai Civil and Commercial Code, section 14, on inconsistent multi-language documents including a Thai text.
- Thai Civil and Commercial Code, section 368, on interpretation of contracts in accordance with good faith and ordinary usage.
General legal information only. Please seek advice on your specific facts. Laws and regulatory practice may change.