Your new engineer lands in three weeks, your company holds Board of Investment (BOI) promotion, and someone has told you the work permit will be “much faster because of BOI.” Nobody has told you how much faster, or what has to already be in place for that to be true.
Here is the short answer. A work permit filed through the BOI route can be processed within 3 hours of complete documentation, while the standard work permit process takes 7-10 business days. But the fast lane is not something you apply for alongside the work permit — your company must already hold BOI promotion status before the route exists for you at all.
Key Takeaways▾
- The BOI’s One Start One Stop Investment Center (OSOS) processes work permit and visa applications and renewals within 3 hours of receiving complete, correct documents, according to BOI OSOS guidance.
- A standard work permit through the Ministry of Labour route takes 7-10 business days after the Non-Immigrant B visa is issued and the employee has entered Thailand, based on Simple Outsource’s own processing experience.
- BOI promotion status is a precondition, not part of the work permit application — the company registers on the BOI’s online Single Window system only after its promotion certificate has been issued.
- Under BOI promotion, work permits run 1 year for a regular position and 2 years for an executive or expert position (BOI, “Working in Thailand”), and the application must be filed within 30 days of BOI approving the position.
What does BOI promotion actually change about your work permit?
It changes where you file, how long it takes, and how long the permit lasts — not whether your employee needs one.
Two names come up constantly here. The One Start One Stop Investment Center (OSOS) is the service centre where BOI-promoted companies file visa and work permit applications; the BOI’s own site lists it in the PARADE Zone, 7th floor of One Bangkok, on Rama IV Road, Lumphini, Pathumwan — it moved there from Chamchuri Square in March 2025, so double-check the address if you are working from an older guide. The Single Window for Visa and Work Permit System is the online system a promoted company registers on, after its promotion certificate is issued, to bring in foreign technicians, experts and their families — that sequencing comes from the BOI’s own “Working in Thailand” page.
So the BOI route is not a different kind of permission. It is the same work permit, obtained through a channel built for promoted companies.
BOI route vs standard route: the side-by-side
| BOI route (via OSOS) | Standard Ministry of Labour route | |
|---|---|---|
| Processing time | Within 3 hours of complete, correct documents (BOI OSOS) | 7-10 business days after the Non-B visa is issued and the employee has entered Thailand (Simple Outsource) |
| Precondition on the company | Must already hold a BOI promotion certificate and be registered on the Single Window system (BOI) | Registered capital of THB 2 million per foreign employee for Thai-majority companies, THB 3 million for foreign-majority companies, plus the 4:1 Thai-to-foreign employee ratio (Simple Outsource) |
| Permit validity | 1 year for a regular position, 2 years for an executive or expert position (BOI) | Varies by application — see the standard work permit process |
| Position extension | Form 11.1 takes 5 working days, Form 11.2 takes 3 working days (BOI OSOS FAQ) | Not handled through OSOS |
| Fees commonly quoted | Re-entry permits processed through OSOS: 1,000 baht single, 3,800 baht multiple (BOI OSOS) | Government fee on the work permit application: THB 750-3,000 depending on permit duration (Simple Outsource) |
Read the last row carefully: those are different fee types — a re-entry permit at OSOS versus the government fee on the application itself. Comparing them gives you a number that means nothing.
Is your company eligible for the BOI work permit route?
Only if it already holds BOI promotion status. This is the point most articles skip, and the one that derails start dates.
The BOI’s “Working in Thailand” guidance is explicit about the order: the promotion certificate is issued first, and then the company registers on the Single Window system to bring in foreign staff. A pending promotion application or a tax privilege from another scheme does not open this channel.
Promotion status also affects the quota maths. Our service page notes that some industries and BOI-promoted companies are exempt from certain quota requirements — the 4:1 ratio is the one employers ask about most, and it is worth confirming against your specific promotion category rather than assuming. Salary floors still apply to BOI positions; we cover those in our guide to work permit minimum salary requirements .
What the BOI route looks like in practice
For a foreign expert under BOI promotion, the BOI OSOS FAQ sets out this order: obtain the Non-Immigrant B visa from a Thai embassy or consulate abroad, apply for stay permission through the BOI, secure the work permit from the Department of Employment, then complete immigration procedures.
Two timing rules sit inside that sequence. The work permit application must be submitted within 30 days of the BOI notifying that the position has been approved (BOI, “Working in Thailand”). And where the need is urgent, the BOI OSOS FAQ states that approval can be granted within 3 hours for a maximum of 30 days — but only once. It is a bridge, not a strategy.
The documents OSOS expects, per its published guidance: a passport with a Non-Immigrant B visa valid at least six months, a medical certificate from a licensed Thai physician, three 5x6cm photographs taken within six months, educational qualifications and employer references, a detailed job description, a power of attorney with a 10 baht duty stamp if a representative files for you, and any relevant professional licences. Renewals also require proof that the previous year’s taxes have been paid.
The obligations that arrive after the permit is issued
Position extensions are requested 15 to 90 days before expiry and granted for one to two years from the expiry date, according to the BOI OSOS FAQ. At management level, extensions require evidence of technology transfer to Thai employees — dates, topics, training methods and results. That is a record you build across the year, not a document you produce the week before filing.
When a BOI-sponsored expert resigns, the company must submit a termination notice 15 days before the expiry date (BOI OSOS FAQ).
When the BOI route is not your answer
If your company does not hold promotion status, chasing BOI promotion to speed up one work permit is the wrong trade. Promotion is an investment decision with its own criteria and timeline, and a 7-10 business day standard filing is not the problem that justifies it. Get the standard route right the first time instead — ratio, registered capital, document set.
What to do next
If you know your promotion status and your position approval date, you can work backwards: position approval, then the 30-day window to file, then an OSOS appointment with complete documents. If either fact is missing, that is where to start.
Simple Outsource manages BOI work permit applications and advises whether your company qualifies for BOI-route processing. For a straight answer on which route your company is actually on, start with our work permit and visa service in Thailand — including the answer that you do not need us.
Frequently asked questions
What is the difference between a BOI work permit and a non-BOI work permit?
It is the same work permit obtained through a different channel. BOI-promoted companies file through the BOI’s One Start One Stop Investment Center, which states it processes applications and renewals within 3 hours of receiving complete, correct documents. Companies without promotion status use the standard Ministry of Labour route , which Simple Outsource sees complete in 7-10 business days once the Non-Immigrant B visa is issued and the employee has entered Thailand.
Can we apply for BOI promotion and the work permit at the same time?
No. The BOI’s “Working in Thailand” guidance sets the order: the promotion certificate is issued first, and the company then registers through the online Single Window for Visa and Work Permit System to bring in foreign technicians, experts and their families. Until the certificate exists, the OSOS channel is not available.
Does BOI status remove the 4:1 Thai-to-foreign employee ratio?
Not automatically for every promoted company. Simple Outsource’s service page states that some industries and BOI-promoted companies are exempt from certain quota requirements, which is why it should be confirmed against your specific promotion category rather than assumed. The 4:1 ratio, alongside registered capital of THB 2 million per foreign employee for Thai-majority companies and THB 3 million for foreign-majority companies, is the standard-route baseline.
What happens if a BOI-sponsored employee resigns?
The company must submit a termination notice 15 days before the expiry date, according to the BOI OSOS FAQ. Treat it as part of offboarding rather than an immigration afterthought, since the position record sits with the BOI as well as with the Department of Employment.
Written and reviewed by the Simple Outsource team — Thailand-based professionals handling company registration, work permits and payroll compliance for foreign-owned businesses.