THAILAND BOARD OF INVESTMENT
One Start One Stop Investment Center (OSOS)
An independent T3 guide to BOI's long-running one-stop investor service — 38 government agencies' information and consultation brought together at a single Bangkok location, from company setup to visas, site selection and aftercare.
Independent T3 guide • Official OSOS/BOI links clearly marked • All OSOS services are free of charge
T3's Role
T3 — The True Thailand is an independent information platform. It does not represent, partner with or speak for the Thailand Board of Investment, OSOS or TIESC, and this page does not imply any endorsement of T3 by BOI.
OSOS and TIESC — How They Relate
The One Start One Stop Investment Center (OSOS) is a Board of Investment (BOI) service that began operating in November 2009, bringing together staff from investment-related government agencies at a single Bangkok location so investors do not need to visit each agency separately. Since the Thailand Investment and Expat Services Center (TIESC) opened on 17 March 2025, OSOS's in-person services operate from the same One Bangkok location as TIESC, alongside Immigration Bureau and Department of Employment counters. T3 exposes OSOS's published services to investors without implying that OSOS itself issues approvals — each participating agency still makes its own decisions.
OSOS at a Glance
Information only — all OSOS services are described as free of charge on OSOS's own website; confirm current scope, hours and appointment arrangements directly with OSOS or TIESC before relying on this page.
Est. November 2009
OSOS has operated as part of the Board of Investment since 2009, expanding its services further in July 2015.
38 Agencies, One Location
Staff from 38 investment-related government agencies provide information and consultation at a single Bangkok address.
Free of Charge
OSOS states on its own website that all services it provides to investors are free of charge.
How OSOS Helps
Six stages, from first contact to ongoing aftercare. OSOS coordinates access to the relevant agencies — it does not itself make approval decisions.
1One Point of Contact, Many Agencies
Instead of visiting agencies individually across Bangkok, investors reach OSOS by email, telephone, in person or online, and OSOS coordinates the relevant officers for a single consultation.
Our Service (opens in a new tab)
2Setting Up the Business
Guidance on registering a company, acquiring a foreign business license, and related procedures — one of 16 published "Setting Up Business" topics ranging from registration to taxes and contracts.
Setting Up Business (opens in a new tab)
3Site Selection
OSOS arranges site visits by coordinating with the Industrial Estate Authority of Thailand — investors send their location requirements and receive a shortlist of potential sites and a site-visit programme.
Our Service (opens in a new tab)
4Visa & Work Permit
The One Stop Service Center for Visas and Work Permits sits alongside OSOS at the same location, along with the Smart Visa Unit and Strategic Talent Center, for foreign personnel connected to an investment.
Setting Up Business (opens in a new tab)
5Aftercare & Ongoing Support
OSOS remains a single point of contact after setup — for further consultation, recruiting and labour questions, tax matters, contract enforcement and other issues that arise as a business operates in Thailand.
Setting Up Business (opens in a new tab)
6Visit or Contact OSOS
OSOS is located on the 7th Floor, PARADE Zone, One Bangkok — the same building as TIESC. Reach OSOS by phone, email or its enquiry form to arrange a consultation before visiting.
Contact OSOS (opens in a new tab)Setting Up a Business — Topic Index
OSOS publishes guidance across 16 topics on its own website, from company registration through to taxes, contracts and insolvency. Each links directly to the official page.
Agencies Represented at OSOS
38 agencies participating in providing information and consultation at OSOS, per OSOS's own "About Us" page (last confirmed count published there; some ministries list more than one participating department).
Office of the Prime Minister
- Office of the Board of Investment
Royal Thai Police
- Immigration Bureau
Ministry of Commerce
- Department of Business Development
- Department of International Trade Promotion
Ministry of Industry
- Department of Industrial Works
- Department of Primary Industries & Mines
- Industrial Estate Authority of Thailand
Ministry of Interior
- Department of Lands
- Department of Public Works and Town & Country Planning
- Provincial Electricity Authority
- Metropolitan Electricity Authority
- Provincial Waterworks Authority
Ministry of Finance
- The Customs Department
- The Revenue Department
- The Excise Department
Ministry of Energy
- Department of Mineral Fuels
- Department of Energy Business
- Department of Alternative Energy Development and Efficiency
- Office of the Energy Regulatory Commission
Ministry of Labour
- Department of Employment
- Department of Labor Protection and Welfare
- Social Security Office
Ministry of Natural Resources and Environment
- Office of Natural Resources and Environmental Policy and Planning
- Royal Forestry Department
Ministry of Public Health
- Food and Drug Administration
Ministry of Transport
- Department of Land Transport
Ministry of Tourism and Sports
- Department of Tourism
Ministry of Science and Technology
- National Innovation Agency
- Thailand Science Park
- Software Park Thailand
Official Link Directory
Every resource below is an official BOI/OSOS property, with a verification date and a scheduled review date.
| Resource | Purpose | Verified | Review After |
|---|---|---|---|
| OSOS Official Website (opens in a new tab) | Main OSOS gateway — services, news, seminars, FAQ | 10 September 2026 | 10 December 2026 |
| About OSOS (opens in a new tab) | History, scope of service and full 38-agency list | 10 September 2026 | 10 December 2026 |
| Our Service (opens in a new tab) | Consultation channels, site-visit arrangement, web services | 10 September 2026 | 10 December 2026 |
| Setting Up Business (opens in a new tab) | 16-topic guidance index (registration, permits, visas, taxes and more) | 10 September 2026 | 10 December 2026 |
| Contact OSOS (opens in a new tab) | Address, phone, fax, email and enquiry form | 10 September 2026 | 10 December 2026 |
| OSOS Enquiry Form (opens in a new tab) | Submit a business plan, agenda or enquiry for a consultation meeting | 10 September 2026 | 10 December 2026 |
| BOI Investment Promotion Guide (opens in a new tab) | Current official BOI guide (PDF) | 10 September 2026 | 10 December 2026 |
Contact Panel
OSOS Contact
Address
One Start One Stop Investment Center (OSOS), One Bangkok, PARADE Zone, 7th Floor, 1877 Rama IV Road, Lumphini, Pathumwan, Bangkok 10330, Thailand
Phone
+66 2209 1100Fax
+66 2209 1199
Confirm Directly Before You Rely on This
Confirm current opening days, hours and appointment arrangements directly with OSOS or TIESC before travelling — this page does not state hours because a current, official hours listing could not be independently confirmed at the time of writing.
Submit an OSOS enquiry (opens in a new tab)Frequently Asked Questions
They are related but not identical. OSOS is BOI's own one-stop investor service, operating since November 2009. TIESC, which opened 17 March 2025, co-locates BOI, Immigration Bureau and Department of Employment counters at One Bangkok. Today, OSOS's in-person services operate from that same One Bangkok location alongside TIESC's other counters.
OSOS's own website states that all services it provides to investors are free of charge. Confirm current terms directly with OSOS if a specific service is unclear.
No. OSOS provides information, consultation and facilitation — it coordinates access to the agencies that make decisions, but each participating agency (BOI, Immigration Bureau, Department of Employment and others) makes its own determination.
Email osos@boi.go.th, call +66 2209 1100, or use the official enquiry form. OSOS will arrange for the relevant officers to join a consultation, and can arrange Chinese or Japanese interpretation on request.
Yes — OSOS coordinates with the Industrial Estate Authority of Thailand (IEAT) to provide a shortlist of potential locations and arrange site visits, based on the requirements an investor submits.
No. OSOS states its services are available to Thai or foreign, large or small, BOI-promoted or non-promoted investors.
No. T3 — The True Thailand is an independent information platform. It does not represent, partner with or speak on behalf of BOI, OSOS or TIESC, and cannot confirm eligibility, book appointments, or guarantee any outcome on their behalf.
Sources & Independence
Source: One Start One Stop Investment Center (OSOS) — official website (osos.boi.go.th) · Accessed 10 September 2026 · About Us, Our Service, Setting Up Business and Contact pages fetched directly during this build.
Independent T3 Disclaimer
T3 — The True Thailand is an independent information platform. It does not represent, partner with or speak for the Thailand Board of Investment, OSOS or TIESC, and this page does not imply any endorsement of T3 by BOI.
Information only — all OSOS services are described as free of charge on OSOS's own website; confirm current scope, hours and appointment arrangements directly with OSOS or TIESC before relying on this page.