Written by the Thai Legal & Immigration legal team · Last reviewed · Editorial policy
The Non-Immigrant B visa is the foundation for foreigners employed by, or directing, a Thai company. It is normally obtained abroad with sponsor documents, then extended in Thailand once a work permit has been issued.
Extension eligibility depends on the sponsoring company: paid-up capital, Thai headcount, tax filings and salary levels are all reviewed. We audit the employer side first so that renewals do not fail on corporate paperwork.
What we handle
- Sponsor document pack for embassy application.
- Corporate compliance audit (capital, Social Security, tax filings).
- Conversion and one-year extension after work permit issuance.
- BOI and Regional HQ fast-track routes.
How the process works
Step 1
Employer audit
We confirm the company meets ratio and filing requirements.
Step 2
Visa application
Embassy application or in-country conversion where permitted.
Step 3
Work permit
Work permit filed with the Department of Employment.
Step 4
Extension
One-year extension of stay filed with immigration.
Not sure this route fits you?
Get a Free Preliminary Eligibility Review from our licensed team.
Why are applications refused, and how do we prepare?
| Common refusal reason | How we prepare |
|---|---|
| Employer documents incomplete or company not eligible | We review company papers before you leave for the embassy. |
| Job description overlaps reserved occupations | We draft a compliant job description. |
Counsel's note
Salary thresholds for extensions vary by nationality. Under-declared salaries on PND 1 filings are a frequent cause of refusals at renewal.
Frequently asked
Can I enter visa-exempt and convert to Non-B?
Does a BOI company need the 4:1 ratio?
Advice by nationality
Why clients choose us
Six licensed Thai attorneys
Including Notarial Services Attorneys registered with the Lawyers Council of Thailand.
77 provinces covered
Offices in Bangkok and Khon Kaen with field representatives nationwide.
Your passport stays with you
We work from copies and only handle originals for filings you approve.
Honest assessment first
A Free Preliminary Eligibility Review tells you your options before any engagement.
Sources & references
- Thai Immigration Bureau (official portal) — checked 2026-11-03
- Department of Employment — checked 2026-11-03
General information only, not legal advice. Immigration decisions rest with the Thai authorities. See our disclaimer.