U.S. documents for Thailand

Thailand is not a party to the Hague Apostille Convention — Acceded 2026-06-30; enters into force 2027-02-28 (HCCH). Until then, embassy legalization is required.. An apostille will not be accepted. U.S. documents must be authenticated and then legalized: state authentication certificate (for state documents), U.S. Department of State authentication, and legalization at Thailand's embassy or consulate in the United States.

The route, step by step

1. State authentication (state documents)

   Request an authentication certificate from the state competent authority, naming Thailand as the destination.

2. U.S. Department of State authentication

   Submit the state-certified or federal document to the Office of Authentications with Form DS-4194 and $20 per document.

3. Legalization at the Thailand embassy or consulate

   Royal Thai Embassy, 2300 Kalorama Rd NW, Washington DC (covers AL, DC, DE, FL, GA, LA, MD, MS, NC, SC, TN, TX, VA, WV, PR; other states use NY, Chicago, LA consulates). Requires state Secretary of State authentication then US Dept of State seal; the embassy does not accept apostilles. $15 per document, money order/cashier's check, 15-21 business days, no expedite.

4. Translation

   Confirm whether Thailand requires a translation and at which stage.

Using U.S. documents in Thailand

Thailand acceded to the Convention on 30 June 2026, and it enters into force for Thailand on 28 February 2027. Until then, U.S. documents must be authenticated by the U.S. Department of State and legalized at the Royal Thai Embassy in Washington, D.C. or a Thai consulate-general; after arrival they are translated into Thai and the translation certified at the Thai Ministry of Foreign Affairs’ Legalization Division. Typical documents: single-status affidavits for marriage (U.S. citizens usually swear the affidavit at the U.S. Embassy in Bangkok instead, which Thai amphur offices accept after MFA legalization), birth and marriage certificates for family and visa matters, degrees for work permits and teaching licenses, FBI background checks for some visas and teaching positions, POAs for property and company matters, and corporate documents. From March 2027 a U.S. apostille will replace the embassy step.

Why U.S. documents are sent to Thailand

• marriage in Thailand (affirmation of freedom to marry)
• retirement/long-stay visas
• work permit
• registration of children
• property/power of attorney

Thailand-specific points

• Non-Hague: notarize/state-certify, then US Dept of State authentication certificate (Form DS-4194, $20/doc, ~4 weeks by mail), then legalization at the destination country's embassy/consulate.
• Switch to apostille only for documents presented in Thailand on or after 2027-02-28.
• Florida documents fall under the Washington DC embassy's jurisdiction.