Audit Report Apostille for International Bidding in Thailand
The Situation
An equipment supplier in Changsha came to us after the first submission had been returned, preparing a bid document set for bid submission in Thailand.
The audit report had been notarized and apostilled. It was then examined by the tender committee, and the objection was not about the Apostille seal. It was about what the earlier stage had certified — the audit firm must hold the licence the receiving authority recognises, and reports from unlicensed firms cannot be certified onward.
What Actually Went Wrong
Thailand is not covered until 28 February 2027, so consular legalisation applies until then.
In this case the gap was narrower: the audit firm must hold the licence the receiving authority recognises, and reports from unlicensed firms cannot be certified onward. Everything downstream was procedurally correct and substantively useless, because the receiving side needed the fact and had been given the form.
Thailand requires consular legalisation until the Convention takes effect.
How It Was Resolved
The fix ran through the audit report plus the firm's practice licence rather than through the Apostille stage. Once that record was in hand, the notarization could certify the report must be signed by two certified public accountants, and single-signature reports are rejected, and the Apostille attached to it meant something.
The redo took five to ten working days at the Apostille stage on top of the time needed to retrieve the record. Because bid submission runs on a fixed deadline, that recovery time came out of the client's own buffer rather than extending the deadline.
The General Rule
Three things decide whether a audit report clears bid submission in Thailand:
One, the audit firm must hold the licence the receiving authority recognises, and reports from unlicensed firms cannot be certified onward.
Two, the report must be signed by two certified public accountants, and single-signature reports are rejected.
Three, Consular legalisation dominates the timeline until the Convention takes effect.
The Apostille stage itself is the predictable part — five to ten working days, no surprises. The surprises all sit upstream and downstream of it.
Check These Before You Submit
- Confirm what the tender committee in Thailand requires, in writing, before notarizing
- Check that the notarization certifies the fact — the audit firm must hold the licence the receiving authority recognises, and reports from unlicensed firms cannot be certified onward
- Verify the report must be signed by two certified public accountants, and single-signature reports are rejected
- Have the audit report plus the firm's practice licence ready before the notary appointment
Legal Basis
Hague Apostille Convention of 5 October 1961; China in force since 7 November 2023.