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For foreign investors expanding in Thailand, establishing multiple companies can make it easier to manage different business activities, markets, assets, and risks. Each entity can focus on a defined business line while maintaining separate accounts, contracts, employees, and operational records. However, a multi-entity structure also creates additional legal, tax, accounting, licensing, transfer-pricing, and corporate-governance obligations.
A common arrangement is a Thai holding company that owns several operating subsidiaries. Each subsidiary can be established for a specific business activity and use the legal pathway appropriate to that activity, such as ordinary Thai-majority ownership, Board of Investment (BOI) promotion, a Foreign Business License (FBL), a Foreign Business Certificate, or another statutory exception. The holding company must also comply with Thai law if it conducts business activities itself, provides services to subsidiaries, or holds assets in a manner covered by the Foreign Business Act (FBA).
Choosing the Right Business Structure
A Thai private limited company is commonly used for operating subsidiaries. Each company is a separate legal entity, which can help keep liabilities, contracts, employees, assets, and finances separate between business lines. This separation is not absolute, however. It does not protect a group from consequences arising from fraud, sham transactions, unlawful nominee arrangements, insolvency-related conduct, or failure to maintain proper corporate separateness.
Foreign ownership can reach 100% in some circumstances. This may be possible when the relevant activity is outside the FBA's restricted activities, the company receives BOI promotion, obtains an FBL or Foreign Business Certificate where applicable, or qualifies for protection under the US-Thailand Treaty of Amity. These routes are activity-specific and may be subject to conditions under the FBA, sector-specific laws, the BOI promotion certificate, land laws, and other regulations.
A branch office is another option, but it is an extension of the foreign parent rather than a separate Thai legal entity. The foreign parent therefore remains responsible for the branch's obligations, including relevant contractual, civil, criminal, and tax liabilities. A branch conducting a reserved or restricted business generally requires an FBL. A branch requiring permission under the FBA may also be subject to minimum investment capital and staged-remittance requirements, including a general minimum of THB 3 million, together with other conditions.
For investors with several business lines, a holding-company structure can provide a more organized approach. The holding company can oversee multiple subsidiaries while each company focuses on its own operations. Before using this structure, investors should determine whether the holding company's activities will be limited to shareholding or whether it will also provide management, financing, marketing, technical, or other services that may require separate licensing or transfer-pricing analysis.
Understanding Foreign Ownership Rules
The FBA divides restricted activities into List 1, List 2, and List 3. Before incorporating a company, investors should identify the actual activities that the company will conduct and determine which list, if any, applies. The classification should be based on the substance of the business rather than only the company's registered objectives or broad industry label.
List 1 activities are generally prohibited to foreigners. List 2 and List 3 activities may be available to foreign-majority companies if the investor obtains the required authorization and satisfies the applicable conditions. An FBL is not a general permit for unrestricted foreign ownership. It authorizes the particular restricted activities described in the license.
BOI promotion can be useful for eligible businesses. Depending on the activity and applicable conditions, it may allow foreign-majority or wholly foreign-owned participation, provide corporate income-tax or import-duty incentives, and grant certain non-tax benefits. For a promoted activity, the company generally obtains a Foreign Business Certificate rather than an FBL. BOI promotion does not automatically override other Thai laws or remove conditions imposed by the BOI or another regulator.
Investors that do not qualify for BOI promotion may need an FBL if they want foreign-majority ownership in an eligible List 2 or List 3 business. A Foreign Business Certificate may also be relevant where the company qualifies under a treaty, statute, or other applicable legal route. US investors may have an additional option under the US-Thailand Treaty of Amity, subject to nationality, ownership, certification, sector, and other requirements. Treaty protection is not a universal exemption from Thai licensing rules or sector-specific restrictions.
Managing Tax and Transfer Pricing
Multiple companies generally mean separate tax and accounting obligations. Thailand does not generally permit corporate groups to file one consolidated corporate income-tax return. Each company normally calculates its own taxable income, submits its own tax filings, and pays tax on its own obligations.
This makes transfer pricing especially important. Transactions between related companies, including management fees, royalties, loans, cost allocations, asset transfers, and other charges, should follow the arm's-length principle. The pricing should be supported by written agreements, commercial explanations, appropriate allocation methods, and evidence that the services or assets were actually provided.
A Thai company with related-party transactions and annual revenue exceeding THB 200 million may be required to submit a transfer-pricing disclosure form and prepare supporting transfer-pricing documentation. Companies below the reporting threshold may not have the same filing and documentation obligations, but they should still use commercially supportable, arm's-length pricing and retain adequate records.
Good recordkeeping is essential, particularly when money, services, intellectual property, employees, or assets move between companies. The group should document invoices, payment records, loan terms, board approvals, service descriptions, cost-allocation calculations, tax treatment, and the business purpose of each transaction.
What Changed in 2026
Thailand has increased scrutiny of companies involving foreign participation, particularly where Thai shareholders may be acting as nominees. In 2026, the Department of Business Development introduced additional documentation and source-of-funds checks in relevant company-registration and amendment filings. Reported requirements include investment-confirmation documents and bank statements showing that Thai shareholders genuinely funded their shares.
The exact documents required depend on the company's structure, the identities and roles of its shareholders and directors, and the type of filing being submitted. The requirements should therefore not be described as an identical documentation package for every company using a 49/51 ownership structure.
A 49/51 arrangement is not automatically unlawful. It must, however, reflect genuine Thai ownership and genuine investment. Thai shareholders should own and fund their shares for their own benefit rather than hold them on behalf of foreign investors to evade the FBA. Investors should not treat the traditional 49/51 structure as a routine workaround for foreign-ownership restrictions.
Build the Structure Before Expanding
A multi-entity setup can provide flexibility, but only when it is planned around the actual businesses the group will conduct. Investors should first map each proposed activity, determine whether the FBA or another sector-specific law applies, and identify the ownership and licensing route available for each entity.
The planning process should address:
- BOI eligibility and promotion conditions.
- FBA classification and FBL or Foreign Business Certificate requirements.
- Treaty or statutory ownership exceptions.
- Minimum capital and funding requirements.
- Land, property, employment, and sector-specific restrictions.
- Corporate income tax, VAT, withholding tax, and payroll obligations.
- Transfer-pricing policies for intercompany transactions.
- Accounting, financial statements, and statutory filings.
- Beneficial ownership, source-of-funds, and nominee-risk controls.
- Board approvals, shareholder rights, and intercompany agreements.
Getting the structure right at the beginning can reduce the risk of costly reorganizations, licensing problems, tax disputes, and regulatory scrutiny later. Foreign investors should obtain advice from qualified Thai legal, tax, accounting, and business professionals before incorporating or moving funds between related entities.
Sources
This article is based primarily on Thailand's Board of Investment 2026 Investment Promotion Guide and BOI guidance on branch offices and foreign-business authorization, the Department of Business Development's materials on the Foreign Business Act, and Thailand Revenue Department guidance on transfer pricing. Current 2026 reporting on DBD Order 2/2569 and related registration checks was also used for the discussion of Thai shareholder funding and nominee-risk documentation. The cited materials indicate that BOI ownership treatment, FBL or Foreign Business Certificate requirements, transfer-pricing obligations, and 2026 registration-document requirements depend on the specific facts and business activity. Investors should confirm the current position with the relevant Thai authorities and professional advisers before acting.