Authentication chain for Certificate of Authority / Signing Authority bound for United States
United States is a member of the Hague Apostille Convention — therefore Certificate of Authority / Signing Authority must pass through: Notary Public → MFA Thailand → Apostille (for United States).
Once the MFA issues an Apostille, United States accepts it directly — no further embassy step required, saving 1-2 weeks and embassy fees.
Our team refreshes United States requirements quarterly to avoid bounce-back on format changes.
About Certificate of Authority / Signing Authority
Notarial confirmation of corporate signing authority for foreign counterparties, banks, and registrars.
Common reasons clients prepare Certificate of Authority / Signing Authority for United States: Signing M&A / Joint Venture agreements with a foreign counterparty · Opening a corporate account with a foreign bank · Registering an overseas branch/subsidiary.
Source documents to bring: Company affidavit issued within 30 days, Memorandum of Association, Directors' passports.
Total cost and timeline
Notary Public: confirmed in a written quotation from staff — turnaround timeline depends on the document — ask our staff.
MFA Consular Affairs (Chaengwattana): confirmed in a written quotation from staff per stamp (standard) or confirmed in a written quotation from staff (express) — 2-3 business days (1-day express available).
Apostille included with the MFA step — no embassy fees.
Total ~5-7 business days · Express ~2-3 days.
Document checklist
- Original Certificate of Authority / Signing Authority (or copy to be certified)
- Signer's Thai ID / passport
- State Apostille as the destination
- Power of attorney (if our runner files on your behalf)
- Certified translation (if the destination requires local language)
FAQ
Will my Certificate of Authority / Signing Authority be accepted in United States?
Yes — after the Apostille, United States accepts it directly with no extra embassy step.
Total turnaround?
5-7 business days · express in 2-3 days.
Total cost?
Notary MFA confirmed in a written quotation from staff per stamp (standard) or confirmed in a written quotation from staff (express) (includes Apostille).
Does an Apostille expire?
The Apostille itself does not expire, but many receiving authorities want documents dated within 3-6 months — verify with the recipient.