Which authority decides a Non-Immigrant B business visa — Visas issued abroad are decided by Thai embassies and consulates-general; extensions, reporting and re-entry permits fall to the Immigration Bureau; work permits to the Department of Employment; promoted companies use the BOI Single Window. BOI-promoted companies use the Single Window / e-Expert channel for visas and work permits, separate from the standard Department of Employment route. A re-entry permit must be obtained before leaving Thailand in order to preserve an existing permission to stay. Work permits are issued by the Department of Employment and are tied to the named employer, position and work location. Check the office hours and any online queue-booking system first, because several offices only serve applicants with a prior appointment. Thai law recognises several forms of will under the Civil and Commercial Code, each with its own witness requirements. Where a minor is involved, evidence of parental authority or parental consent must be included. NAATI credentials in Australia come in different levels, and some recipients specify a minimum certification level. We confirm at the outset that the chosen document route actually matches the receiving body’s requirements before quoting time and cost.
“Which authority decides a Non-Immigrant B business visa?” falls within an end-to-end service that combines document preparation, translation, signature certification, consular legalisation and coordination with the destination mission into a single file. The people who search for it are usually preparing a filing against a fixed deadline, recovering from a rejected submission and trying to identify the missed step, or coordinating documents for several people at once.
In practice, each step sits with a different body: the issuing office, the Notarial Services Attorney, the Department of Consular Affairs, and the destination country’s diplomatic mission. Knowing which body owns which step makes it possible to judge how many stages a bundle needs, and which of them cannot be corrected without starting again.
This is a baseline set. Individual receiving authorities may add requirements, so confirm with the destination body first.
Record how many stages each document needs, who certifies it, and what must finish first, so no step has to be redone.
Check personal names, company names, addresses and dates across the whole bundle before any certification begins.
Original → translation → signature certification / legalisation → destination mission. Doing these out of order forces a restart.
Verify the number of sets, the seals, the binding, and that issue dates are still within the destination’s validity window.
| Route | When it applies |
|---|---|
| Notarial Services Attorney certification | For privately drafted instruments — powers of attorney, affidavits, consent letters — signed in the attorney’s presence. |
| Legalisation at the Department of Consular Affairs | Where a foreign authority needs confirmation of the Thai issuing office’s signature and seal, or of the translation. |
| Attestation at the destination mission | Where the destination country requires its embassy or consulate in Thailand to attest the file after consular legalisation. |
| Thailand’s Apostille status | Thailand acceded to the Apostille Convention on 30 June 2026 and it enters into force for Thailand on 28 February 2027. No Apostille is issued in Thailand before that date. |
If you are working through “Which authority decides a Non-Immigrant B business visa?”, start by getting the receiving authority’s requirement in writing, then plan the certification chain backwards from your real filing date.