Notarising contracts and agreements signed in Thailand
Short answer
Contracts signed in Thailand are notarised by having each signatory sign in front of a Notarial Services Attorney, who certifies the signatures and identities. The certification covers execution, not the fairness or legality of the terms. Certification usually takes 1–2 business days, with translation and legalisation added when the destination requires them.
When a contract signed in Thailand has to be relied on abroad, the counterparty or registry often asks for proof that the signature is genuine. The Notarial Services Attorney witnesses the signing and certifies the signature and the identity of the signatory — the commercial terms of the contract remain a matter between the parties.
When this is needed
- • Sale and purchase agreements with an overseas buyer or seller
- • Employment or service agreements used in a visa or work permit application abroad
- • Loan and guarantee documents required by a foreign bank
- • Share transfer and joint venture agreements filed with a foreign registry
- • Licensing or distribution agreements requiring proof of execution
What to prepare
- • Final version of the contract, with no blank fields left to be completed later
- • Original identification of every signatory attending
- • Corporate records and authority evidence where a party is a company
- • Any annexes or schedules referred to in the contract, attached before signing
- • Confirmation of how many originals each party needs
Step-by-step process
1. Finalise the text before the appointment
Every blank must be filled and every annex attached. Handwritten changes after certification can invalidate the whole document in the eyes of the receiving authority.
2. Verify signing authority
For corporate parties, the attorney checks the affidavit and any board resolution to confirm the signatory can bind the company.
3. Sign in the attorney's presence
All signatories present sign during the appointment. Where a party signs elsewhere, their signature is certified separately in their own jurisdiction.
4. Translate and legalise as required
The signed set is translated by a recognised translator and, if the destination requires, legalised by the Department of Consular Affairs and then apostilled or embassy-legalised.
Common reasons documents are rejected
- • Blank fields or unattached annexes at the time of signing
- • Amendments written on the document after certification
- • A corporate signatory who is not authorised in the company affidavit
- • Only some parties' signatures certified, leaving the document incomplete for the registry
- • Different versions of the contract circulating, so the certified copy does not match the counterparty's version
Frequently asked questions
Does notarisation make the contract legally enforceable?
No. Enforceability depends on the applicable law and the terms themselves. The certificate only evidences who signed and when.
Can parties in different countries sign the same contract?
Yes. Each party's signature is certified where they are, and the certified counterparts are then combined. Confirm that the receiving authority accepts counterparts.
Can a contract in English be notarised in Thailand?
Yes. The attorney certifies the signature regardless of the contract's language. A translation may still be needed for the receiving authority.
How many original sets should be certified?
Prepare one certified original for each party plus any set the registry retains, since producing more later requires all signatories to attend again.
Does the attorney review the contract terms?
Notarisation does not include legal advice on the terms. If you need the terms reviewed, arrange separate legal advice before the signing appointment.
What if a signatory cannot attend?
They can appoint an attorney-in-fact through a notarised power of attorney, provided the receiving authority accepts signature by proxy.
Related documents
- Corporate documentsHow company affidavits, shareholder lists, board resolutions, and director signatures are notarised in Thailand for foreign registries, banks, and counterparties.
- Power of attorneyHow a power of attorney signed in Thailand is notarised by a Notarial Services Attorney for use overseas: documents to prepare, the certification chain, common rejection reasons, and FAQs.
- Certified true copyHow a Notarial Services Attorney certifies that a copy matches the original Thai document, which originals must be presented, and how the copy fits into the overseas legalisation chain.
Related services
Reviewed August 2026. General procedural information only, not legal advice. Confirm current requirements with the Lawyers Council of Thailand and the Department of Consular Affairs.