“Non-Immigrant visa” is a family of Thai visa categories for purposes other than a short tourist visit. It is not one universal 90-day visa. The letter on the visa—such as B, O or ED—identifies the underlying purpose and affects the documents, extensions and activities permitted.
Main categories
- B: business, employment and certain investment activities. Work usually also requires separate authorization.
- O: qualifying family, retirement and other specified purposes.
- ED: approved study, training or research.
- F: official duties; M: media work; IB: qualifying investment or BOI-related activity.
- Other specialist categories apply to diplomacy, experts, religion and official missions.
What “90-day visa” usually means
A single-entry Non-Immigrant visa may lead to an initial permission to stay of up to 90 days, but the immigration officer’s stamp is decisive. This is different from 90-day address reporting, which is a recurring notification duty for many people who remain in Thailand long term.
Single versus multiple entry
Single and multiple entry describe how the visa may be used during its validity. They do not automatically preserve an extension already granted inside Thailand. Before travelling, check whether a re-entry permit is required to protect the current permission to stay.
Visa, extension and work permit
A visa facilitates travel and application for entry. An extension permits a longer stay inside Thailand. A work permit or other lawful work authorization concerns employment. One document does not automatically replace the others.
Before applying
- Define the real purpose of the stay.
- Check the category at Thai e-Visa or the responsible embassy.
- Confirm whether the application must be made abroad.
- Prepare sponsor, financial, family, study or company evidence.
- After entry, verify the stamp before leaving immigration.
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