What changed when both countries became Hague members
India ratified the Hague Apostille Convention in 2005; Thailand acceded with effect from 28 February 2027. From that date, civil, commercial, and educational documents issued in Thailand and destined for any Indian authority — central or state — no longer require attestation at the Embassy of India in Bangkok, then re-attestation by the Indian Ministry of External Affairs (MEA), then state-level Sub-Divisional Magistrate sign-off. A single Apostille from Thailand's Department of Consular Affairs is now the entire authentication chain.
For Thai applicants this collapses a 14–21 day, four-step pipeline into a 5–8 business day, single-step issuance. NYC's average corridor file for India closed at THB 4,500 in the last 90 days versus THB 8,500 under the pre-Hague flow — a 47% cost reduction.
OCI (Overseas Citizen of India) — most common Thai use case
OCI is the lifetime visa granted to people of Indian origin and to foreign spouses of Indian citizens. For a Thai national married to an Indian citizen, the documentary set is: (1) Thai marriage certificate (Kor.Ror.3) + certified English translation, (2) Thai birth certificate + translation, (3) Royal Thai Police clearance certificate, (4) sometimes a sworn affidavit of marital status.
All four are now Apostilled at Thai MFA and filed directly at IVAC Bangkok (or the Indian Consulate in Chiang Mai) for the OCI miscellaneous service. Processing time at IVAC averages 4–6 weeks after document despatch. NYC's role ends at MFA Apostille + courier delivery to IVAC.
X-1 / E employment visas — corporate documentary pack
Thai nationals taking up employment with Indian IT corporates (Infosys, TCS, Wipro, Tech Mahindra) in Bengaluru, Hyderabad, or Pune typically receive an X-1 (associate/spouse) or E (employment) visa with a 1-year initial validity. Required documents: degree certificate + transcript, professional licence (if applicable), Royal Thai Police clearance issued within the last six months, and an experience affidavit from the previous employer.
A standard 4-document corporate pack: translation to English THB 2,800 + MFA Apostille THB 1,600 + handling THB 1,500 = THB 5,900, completed in 5–8 business days, then DHL'd directly to the HR onboarding contact in India.
Hindi translation — when it's actually required
MEA and Government of India central authorities accept English as a working language. State authorities differ: Uttar Pradesh, Madhya Pradesh, Rajasthan, and Bihar frequently demand a parallel Hindi translation for Aadhaar/PAN linking and property registration. NYC fields an MFA-recognised Hindi translator and prices the parallel deliverable at THB 1,800 per page.
South Indian states (Tamil Nadu, Karnataka, Kerala, Andhra Pradesh) use English as the second official language; a Hindi translation provides no additional value there and is typically declined by local registries.