Standard work permit vs BOI / Smart Visa channel in Thailand
Working legally in Thailand requires both the right visa category and a work permit. The standard route runs through the Department of Employment, where the sponsoring company must meet registered-capital and Thai-staff ratio thresholds. BOI-promoted companies and qualifying specialists instead use the One Stop Service / Smart Visa channel, which relaxes the staff ratio and grants longer permissions.
Bottom line: Ordinary Thai employers with standard roles should use the regular route. If the employer holds a BOI promotion certificate, or the applicant is a specialist, investor, senior executive or startup founder in a targeted industry, the BOI / Smart Visa channel is faster and materially more flexible.
Side-by-side comparison
| Criterion | Non-B visa + standard work permit | BOI / One Stop Service / Smart Visa |
|---|---|---|
| Filing authority | Department of Employment + Immigration | One Stop Service centre / BOI |
| Thai-staff ratio | Ratio applies per foreign employee | Relaxed under the promotion conditions |
| Validity granted | Usually tied to the contract with annual renewal | Longer, renewed centrally at the OSS |
| Processing | Depends on the local employment office queue | Faster — steps consolidated in one counter |
| Company documents | Financials, tax filings, full employee register | Promotion certificate and BOI position approval |
Choose Non-B visa + standard work permit when
- The employer is an ordinary Thai company without promotion
- The role is a standard position outside targeted industries
- You need to start quickly using the company's existing paperwork
Choose BOI / One Stop Service / Smart Visa when
- The company holds a BOI promotion certificate
- The applicant is a specialist, investor or executive in a targeted sector
- You want longer validity and fewer annual renewals
Documents to prepare
- Passport with a valid visa page
- Employment contract and employer certification letter
- Degree certificate and experience letters (translated and legalized if issued abroad)
- Company affidavit, shareholder list and latest financial statements
- Medical certificate in the prescribed form
- BOI promotion certificate and position approval (BOI route only)
Step-by-step process
- Screen applicant eligibility and employer readiness before filing
- Prepare degrees and foreign documents with translation and legalization
- Obtain the correct visa category or convert status inside Thailand
- File the work permit at the Department of Employment or the OSS
- Collect the permit, file residence notification and 90-day reporting
- Diary renewals at least 30–45 days ahead
Common pitfalls
- Starting work before the permit is issued — penalties apply to both sides
- A job title that does not match the actual duties, flagged on inspection
- Foreign degrees without the full legalization chain
- Visa and permit expiry dates drifting apart, forcing a restart
Frequently asked questions
- Do I need the visa before the work permit?
- Yes. You must already hold a visa category that permits employment before filing the work permit; otherwise you convert your status or apply for a new visa abroad.
- What happens when I change employer?
- A work permit is employer-bound. The old employer files a termination notice and the new application must be filed within the statutory window, or the right to stay lapses.
- Who is Smart Visa for?
- Science and technology specialists, investors, senior executives and startup founders in targeted industries, with longer stays and lighter reporting duties.
- How does your team help?
- We pre-screen eligibility, sequence the whole document set, translate and legalize foreign records, file and follow up to collection, and diary renewals for you.
Prefer not to run the paperwork yourself?
Our team is an advisory practice, not just a filing agency. With 15+ years of cross-border document work we map the full route before you spend anything: we confirm what the receiving authority actually accepts, sequence translation, notarisation and legalisation in the right order, forecast a realistic timeline, and flag the details that normally cause rejections. Send us photos of your documents for a free initial assessment.
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