What Documents Are Required to Establish a Branch Company in Thailand? How Long Does BOI Approval Take? A Comprehensive Guide to the Entire Registration Process

Establishing a branch office in Thailand is not as simple as completing forms and waiting for the license. In practice, the preparation of documents, the logic of approval procedures, and inter-departmental coordination-often down to minute details-determine the pace and ultimate success or failure of the entire process.

Core Documents Required for Registering a Branch Office in Thailand

1. Original resolution of the parent company’s board of directors, explicitly authorizing the establishment of a branch office in Thailand and appointing the Chief Representative;

2. Notarized and authenticated copies of the parent company’s most recent Certificate of Incorporation and Articles of Association (requiring double authentication by a Royal Thai Embassy or Consulate abroad);

3. Proof of registered local address in Thailand for the branch office (e.g., lease agreement or title deed), accompanied by a certified Thai translation;

4. Copy of the Chief Representative’s passport and a Certificate of No Criminal Record (requiring authentication by the Thai Ministry of Foreign Affairs);

5. Capital verification letter issued by a Thai bank (though branch offices are not subject to a minimum capital requirement, proof must be provided that operational funds are legally sourced and sufficient);

6. Description of the branch office’s business scope (must comply with Thailand’s Foreign Business Act restrictions; additional licenses may be required for certain industries).

BOI Application Timeline and Key Milestones

Approval by the Thailand Board of Investment (BOI) does not follow a fixed timeframe. Under standard procedures, preliminary review typically takes 15-20 working days from the date of complete submission. For projects falling under priority promotion categories (e.g., new energy, digital healthcare, automated manufacturing), an expedited review channel is available, reducing average processing time to 8-12 working days. Projects requiring cross-departmental technical assessments (e.g., environmental compliance, land-use planning) may take 6-8 weeks. Note The more times supplementary documentation is requested, the longer the overall timeline becomes-thus, completeness and accuracy of the initial submission are critical.

Key Steps in the Full Registration Process

1. Determine the business type and foreign shareholding structure, and conduct a preliminary BOI eligibility assessment;

2. Submit the BOI application while simultaneously preparing branch office registration documents;

3. Upon BOI approval, submit the branch office registration application to the Department of Business Development (DBD), Ministry of Commerce;

4. Upon DBD approval, obtain the Certificate of Registration for the branch office;

5. Complete tax registration (Forms PND 1 and PND 20), social security registration (SSO), and filing for work permits for foreign employees with the Ministry of Labour.

Common Bottlenecks and Practical Tips

The four most frequent causes of delay in practice are (i) failure to obtain double authentication for required documents; (ii) vague or inaccurate business descriptions leading to incorrect BOI classification; (iii) inability to verify the registered address on-site; and (iv) mismatch between the Chief Representative’s visa type and work permit requirements (e.g., holding a tourist visa does not permit direct conversion to a work permit). It is strongly recommended to engage a local practicing lawyer experienced in both DBD and BOI procedures for pre-submission document review before initiating the process.

The above outlines the core requirements and practical roadmap for registering a branch office in Thailand and applying for BOI promotion. If you have related questions-or wish to explore industry-specific market access requirements, detailed document authentication procedures, or the precise applicability boundaries of BOI incentives-we recommend consulting, in advance, a qualified cross-border corporate registration and compliance service provider aligned with your specific business context.