Foreign Business in Thailand: Comparing BOI, FBL, and Treaty of Amity

Reviewed by ThaiLawOnline, a licensed Thai law firm practising in Thailand since 2006. Thai lawyer of record: Wichuda Atthamethakon, LL.M., Thai Bar Licence 3149/2556.

Last updated on 30 September 2026

Licence exemptions: check the activity first

The official text of Ministerial Regulation No. 5 B.E. 2569, published on 28 August 2026, adds two securities services and six further service categories to the exemptions and revises the derivatives provision. The eight additions are securities-purchase lending; reverse repurchase transactions; qualifying Type 1 telecommunications; treasury centres; qualifying intra-group administration, HR and IT; qualifying intra-group domestic debt guarantees; employee-service machine space rental; and petroleum drilling under a direct qualifying contract. Derivatives changes are a separate revision to an existing provision. The conditions matter: an exemption from the Foreign Business Act licence requirement does not remove a sector licence or authorise an unrelated activity.

For intra-group administration, HR and IT and domestic guarantees, check the relationship tests in clauses 3(15) and 3(16). These cover a majority overlap in shareholders or partners by number, a shareholder or partner holding at least 25% in each entity, one entity holding at least 25% in the other, or a majority overlap in authorised directors or managing partners. A shared brand or informal group relationship is insufficient. Hotels, restaurants and tour businesses do not appear among these eight additions. Foreign ownership definitions and the prohibition on nominee arrangements remain applicable.

Thailand has three main legal ways for foreign investors to own their businesses fully or mostly. These are: Board of Investment (BOI) promotion, Foreign Business License (FBL), and the US-Thailand Treaty of Amity. Each pathway serves different investor needs, with distinct advantages, requirements, and limitations. Knowing these differences is important for making smart investment choices. These choices should match your business goals, nationality, industry, and long-term plans.

The Rule All Three Routes Turn On: the Foreign Business Act

Every route below exists because of one definition. Section 4 of the Foreign Business Act B.E. 2542 treats a company registered in Thailand as an alien where aliens hold shares amounting to half or more of its capital, or have invested half or more of the total capital. The test is the half, which is why the Thai side has to hold more than half and why the shorthand for a Thai-majority company is 49 percent. A company that crosses the line is an alien for the purposes of the Act no matter where it was incorporated, and everything that follows applies to it.

What being an alien costs you depends on the activity, which section 8 sorts into three Lists annexed to the Act. A List 1 business is closed to aliens outright. A List 2 business needs the permission of the Minister with the approval of the Cabinet. A List 3 business, which is where most service businesses sit, needs the permission of the Director-General with the agreement of the Board. An activity that appears on none of the three Lists needs no permission under this Act at all, which is the first thing to establish and the reason the exemption check at the top of this page comes first.

The routes then divide into two instruments, and the difference is not cosmetic. A company promoted by the Board of Investment, or authorised under the industrial-estates law, notifies the Director-General and receives a certificate under section 12, and while it holds that promotion it is exempt from this Act apart from the provisions the section preserves. An American company under the Treaty of Amity notifies and receives a certificate under section 11, which the Director-General must issue within 30 days of a compliant notification. Neither is an application that can be weighed on its merits: the entitlement comes from the promotion or the treaty, and the certificate records it.

The Foreign Business Licence is the opposite. Under section 17 an alien applies, and the application is decided: the Cabinet decides a List 2 application and the Director-General a List 3 one, within 60 days of filing, extendable by up to 60 days more where the Cabinet cannot finish in time; the licence itself is issued within 15 days of approval. So the practical question is not which route sounds best but which one you are entitled to. If an activity is promotable, promotion gives you a certificate; if you are American, the treaty gives you a certificate; if neither, you are asking for a discretionary licence, and that is the route that can be refused.

Board of Investment (BOI) Promotion: The Premium Pathway for Foreign Business in Thailand

Overview and Strategic Value

The BOI promotion is Thailand’s main investment program. It aims to attract valuable foreign investment in key sectors. These sectors support the country’s economic development goals. The program changes foreign businesses from limited entities into promoted companies. These companies gain important benefits that go beyond basic ownership rights.

Key Benefits and Incentives

The BOI promotion provides the best benefits for foreign investors in Thailand. Tax incentives are a key part of BOI benefits. Corporate income tax exemptions last from 3 to 13 years. The length depends on the activity promoted and where the investment is located. High-technology activities and knowledge-based operations focusing on research and development are examples. They can receive up to 13 years of complete corporate income tax exemption.

The 2025 enhanced incentive structure brings important changes for small and medium businesses. It extends corporate income tax exemptions from 3 years to 5 years. It also raises the exemption rate from 50% to 100% for investments in efficiency-related improvements. You can get more tax benefits. These include no import duties on machinery and raw materials. You can also get double deductions for transportation and utility costs. Additionally, there are tax exemptions on dividends during the promotion period.

Non-tax privileges provide equally valuable advantages. BOI-promoted companies have 100% foreign ownership rights. Even in sectors usually limited by the Foreign Business Act, foreign-owned companies can find chances through strategic partnerships. Foreign-owned BOI companies can also be permitted to own land for their promoted operations, on criteria the BOI tightened in 2024 and 2025 (see our BOI incentives page).

Work permit and visa benefits significantly streamline human resource management. BOI companies benefit from expedited work permit processing: the BOI approves the foreign positions in the project itself, and the Immigration Bureau’s 4:1 Thai-employee ratio, which governs the ordinary business extension of stay, does not apply to them.

Eligibility Requirements and Application Process

The BOI promotion has eight main activity categories.

1. Agriculture and agricultural products
2. Mining and basic metals
3. Light industry
4. Metal products and machinery
5. Electronics
6. Chemicals and plastics
7. Services and public utilities
8. Technology and innovation development

Each category contains specific sub-activities with defined criteria for promotion eligibility.

The application process changes with the size and complexity of the investment, whether or not the applicant is already a Thai limited company. Projects under THB 200 million receive consideration within 40 working days, while larger projects require 60-90 working days. The process involves comprehensive project evaluation, including detailed business plans, financial projections, technology transfer capabilities, and economic impact assessments.

Capital requirements vary by activity; the general floor is a project investment of at least THB 1 million, excluding the cost of land and working capital, which is a different measure from the registered capital an FBL or Treaty company needs. However, BOI expects substantial investment commitments commensurate with the incentives granted.

Strategic Considerations and Limitations

BOI promotion works best for investors with significant capital commitments and long-term operational plans in Thailand. The comprehensive benefits justify the complex application process and ongoing compliance requirements for businesses that can fully utilize the available incentives.

Sector limitations restrict BOI promotion to government-defined priority activities. Businesses outside these categories cannot access BOI benefits regardless of their investment size or potential economic impact. Land-ownership privileges also depend on the BOI’s current land criteria, which it tightened in 2024 and 2025.

Foreign Business License (FBL): The Comprehensive Access Route

Overview and Scope

The Foreign Business License gives the best access to restricted business activities in Thailand. It allows foreign-majority companies to operate in List 2 and List 3 activities under the Foreign Business Act. Unlike BOI promotion’s sector-specific focus, FBL can accommodate virtually any business activity not explicitly prohibited to foreigners.

Access to Restricted Activities

FBL allows foreign investment in List 2 activities. These activities relate to national security, arts, culture, and natural resources. However, they need Cabinet approval to obtain a foreign business license, and under section 15 Thai shareholders must still hold at least 40% of the capital (reducible by the Cabinet to 25%) with at least two-fifths of the directors Thai. List 3 activities where Thai nationals are not yet ready to compete with foreigners. These require approval from the Ministry of Commerce through the Foreign Business Committee.

List 3 encompasses most service sector activities including consulting, legal services, accounting, engineering, advertising, trading, retail, hospitality, and construction. This wide coverage makes FBL the main option for service-oriented businesses. These businesses do not qualify for BOI promotion or Treaty of Amity benefits.

Eight services no longer need an FBL (Gazette publication: 28 August 2026). Under the Ministerial Regulation Prescribing Service Businesses Not Requiring Permission for Foreigners to Operate Businesses (No. 5) B.E. 2569, published in the Royal Gazette on 28 August 2026 and in force, a foreigner does not need a Foreign Business Licence or Certificate for these eight service businesses:

• Type 1 telecommunications services, meaning services provided without the operator’s own network. The NBTC licence is still required.
• Treasury centre services carried on under the Bank of Thailand’s exchange control rules.
• Securities-purchase lending, subject to the applicable securities-law conditions.
• Buying securities under a reverse repurchase agreement, subject to the applicable securities-law conditions. The regulation separately revises the existing derivatives exemption.
• Administrative, human resources and IT management services, but only between related companies that meet the regulation’s shareholding or directorship test.
• Guarantees of domestic debts, but only between related companies that meet the regulation’s shareholding or directorship test.
• Petroleum drilling services under a contract made directly with a petroleum concessionaire, production-sharing contractor or service contractor under petroleum law.
• Leasing space for ATMs, electronic financial service machines or vending machines for the benefit of a company’s own employees.

Sector licences still apply (NBTC, Bank of Thailand, SEC, Department of Mineral Fuels), and the intra-group test is narrow: being affiliated in a loose sense is not enough. The 49 percent threshold and the three Lists are unchanged. On 14 September 2026 the Department of Business Development publicly denied online claims that hotels, restaurants, tour operators, souvenir shops, sports services or language schools are covered: they are not, and they still need an FBL. Full detail on our Foreign Business Act page.

Application Process and Requirements

Capital requirements establish the foundation for FBL applications. Section 14 of the Foreign Business Act sets the minimum capital an alien must bring to start a business in Thailand at THB 2 million, and at least THB 3 million for each business that needs a licence under the Lists. The ministerial regulation made under section 14 may set the period within which that capital must be brought into Thailand, so plan to transfer it from abroad and keep the bank evidence.

The application process involves extensive documentation and review procedures. Key requirements include detailed business plans showing economic benefits to Thailand, which are essential for foreign-owned companies. You must provide financial statements that prove company stability. Technology transfer proposals are also needed. Lastly, there should be commitments to hire Thai nationals.

Processing timelines typically range from 60 to 120 days, making FBL the slowest pathway among the three options. The Foreign Business Committee evaluates applications based on economic impact, national security considerations, technology transfer potential, and benefits to Thai society.

Strategic Benefits and Limitations

FBL offers maximum flexibility in business activity selection, accommodating companies that cannot access BOI or Treaty of Amity benefits. The license provides full foreign ownership rights and operational independence once granted.

However, FBL provides no tax incentives or special privileges beyond ownership rights. Companies must follow Thai tax rules and job requirements. This includes the 4:1 ratio of Thai to foreign employees, which Immigration applies to the one-year extension of stay rather than the Department of Employment to the work permit.

Application complexity and uncertainty represent significant challenges. The committee-based approval process involves subjective assessments of economic benefit and national interest, creating approval uncertainty even for well-prepared applications.

US-Thailand Treaty of Amity: The American Advantage of a Foreign Business in Thailand

Overview and Special Status

The Treaty of Amity and Economic Relations was signed in 1966. It gives American citizens and companies national treatment in Thailand. This means they are mostly exempt from the Foreign Business Act restrictions. This bilateral agreement provides Americans with unique investment privileges unavailable to other nationalities.

National Treatment Benefits

American investors have the same rights as Thai companies in many business areas. This includes 100% ownership, operational independence, and equal regulatory treatment with local businesses. This status eliminates the need for Foreign Business Licenses in most sectors and simplifies regulatory compliance.

Streamlined Setup Process

Treaty of Amity certification typically requires 4-6 weeks for completion, making it the fastest pathway to 100% foreign ownership. The process involves US Embassy certification of American ownership and control, followed by a certificate from the Department of Business Development, which section 11 of the Foreign Business Act requires within 30 days of a compliant notification.

Eligibility Requirements and Restrictions

Ownership and control requirements state that American shareholders must own at least 51% of company shares. Additionally, at least 50% of the board of directors must be American citizens. These requirements must be maintained throughout the company’s operation to preserve Treaty benefits.

Capital requirements establish a THB 3 million minimum registered capital, reflecting the foreign-majority ownership structure. This requirement aligns with standard Foreign Business Act provisions for foreign-controlled companies.

Sector restrictions limit Treaty benefits in specific areas deemed sensitive to national interests. Prohibited sectors include land ownership, communications, transportation, fiduciary functions, banking with depository functions, natural resource exploitation, and domestic trade in agricultural products.

Strategic Considerations

Treaty of Amity provides exceptional value for qualifying American investors, combining rapid setup, full ownership rights, and national treatment status. The pathway particularly benefits service-oriented businesses, trading companies, and technology firms that don’t require BOI’s manufacturing-focused incentives.

Future uncertainty surrounding the Treaty’s status presents a strategic consideration. World Trade Organization obligations require Thailand to provide equal treatment to all member nations, potentially affecting the Treaty’s preferential benefits. However, no immediate changes are anticipated, and the Treaty remains fully operational.

Comparative Analysis and Decision Framework

Table: Comparing BOI Promotion, Foreign Business License (FBL), and Treaty of Amity

Pathway	Capital Requirement	Processing Time	Ownership Rights	Tax/Non-Tax Benefits	Best For
BOI Promotion	From THB 1 million (varies by activity)	40-90 working days	Up to 100% in promoted sectors	3-13 years corporate income tax exemption, import duty exemptions, land ownership, relaxed work permits	High-tech, manufacturing, innovation-driven, or large-scale investors
Foreign Business License (FBL)	THB 2-3 million (some sectors higher)	60-120 days	Up to 100% in approved List 3 activities; List 2 needs at least 40% Thai shareholding (section 15)	No tax incentives, only access rights	Non-BOI sectors, mainly services (consulting, legal, retail, engineering, trading)
Treaty of Amity (US only)	THB 3 million	4-6 weeks	100% ownership for US citizens, equal to Thai nationals	Faster setup, national treatment, no need for FBL	American service firms, trading companies, tech businesses seeking quick market entry

Investment Size and Capital Considerations

BOI promotion offers the most flexible capital requirements, with minimums starting from THB 1 million depending on the activity. However, meaningful BOI benefits typically require substantial investment commitments that justify the extensive incentive packages provided.

Foreign Business License requires THB 2-3 million minimum capital for most activities, with higher thresholds for specific sectors. The capital must demonstrate serious commitment to long-term operations in Thailand.

Treaty of Amity mandates THB 3 million minimum capital, reflecting its foreign-majority ownership structure. This requirement, while higher than some BOI activities, remains accessible for most serious American investors.

Processing Time and Setup Efficiency

Treaty of Amity offers the fastest setup at 4-6 weeks, providing immediate 100% ownership for qualifying American businesses. This speed advantage suits investors needing rapid market entry or those operating in competitive environments.

BOI promotion requires 40-90 working days depending on investment size, representing a middle ground between speed and comprehensive benefits. The timeline reflects the thorough evaluation process necessary for significant incentive grants.

The Foreign Business License takes the longest to process, usually 60 to 120 days. This is due to a complex review process and many required documents.

Sectoral Coverage and Business Activities

BOI promotion provides access to eight defined activity categories with specific sub-activities eligible for promotion. This structure works well for manufacturing, technology, and innovation-focused businesses but excludes many service sector activities.

The Foreign Business License covers many sectors. It allows almost any business activity listed in Lists 2 and 3 of the Foreign Business Act. This comprehensive access suits service businesses, trading companies, and specialized industries not covered by BOI or Treaty frameworks.

Treaty of Amity provides national treatment across most sectors except specifically prohibited areas. This broad access works well for diverse American business interests while maintaining strategic restrictions on sensitive sectors.

Long-term Benefits and Operational Advantages

BOI promotion provides great long-term value. It offers big tax savings, special operational privileges, and strategic benefits. These can greatly improve profits during the incentive period. The comprehensive package justifies the complex application process for eligible businesses.

Foreign Business License provides basic operational rights without additional benefits beyond ownership and activity permissions. The license serves as a regulatory compliance tool rather than a business development incentive.

The Treaty of Amity provides good long-term value. It offers national treatment status and easier regulatory compliance. However, it does not include specific tax incentives or extra operational privileges beyond ownership rights.

Strategic Recommendations by Investor Profile can guide foreign companies in choosing the right business structure.

Technology and Innovation Companies

American technology companies should focus on the Treaty of Amity for quick setup and national treatment benefits. The BOI promotion can be a second option if their activities fit into digital or innovation categories.

Non-American technology investors should seek BOI promotion in technology and innovation. This will help them access incentives, tax benefits, and easier work permit processes.

Manufacturing Operations

Manufacturing investors should think about BOI promotion, no matter their nationality. This is because there are great tax incentives, land ownership rights, and good employment ratios for manufacturing activities.

American manufacturers have two options. They can choose BOI promotion for the best benefits. Alternatively, they can select the Treaty of Amity for a faster setup. They can choose if they want more incentives or faster market entry. This is important if they are starting a limited company in Thailand.

Service Sector Businesses

American service companies gain the most from the Treaty of Amity. This treaty offers national treatment and wide access to sectors. It does this without the restrictions and complexity of FBL applications.

Non-American service providers usually need to apply for a Foreign Business License. They must show clear economic benefits to Thailand. They also need to demonstrate their ability to transfer technology. This can help improve their chances of getting approved.

Trading and Commercial Operations

High-capital trading operations can have full foreign ownership without a licence, because they fall outside List 3 of the Foreign Business Act. Wholesale is on List 3 only where the minimum capital per shop is under THB 100 million (item 15). Retail is on List 3 where the total minimum capital is under THB 100 million or the minimum capital of any shop is under THB 20 million (item 14), so a retailer needs both to get out. More on trading companies.

Smaller trading operations need either FBL for non-Americans or the Treaty of Amity for Americans. BOI promotion is possible for qualifying international trading or logistics operations.

Last reviewed: 30 September 2026. Sections 4, 8, 10, 11, 12, 14, 15 and 17 of the Foreign Business Act B.E. 2542 were read in Thai. The BOI incentive figures, processing times and land criteria, the Treaty of Amity eligibility and capital figures, and Ministerial Regulation No. 5 B.E. 2569 were not re-read in this review; confirm them with the BOI, the Department of Business Development or us before relying on them.

FAQs on Foreign Business in Thailand

Conclusion and Implementation Strategy

The choice between BOI promotion, a Foreign Business License, and the Treaty of Amity depends on several factors. These include nationality, business sector, investment size, timeline needs, and long-term goals.

BOI promotion is the best choice for investors in eligible activities. It is for those who can invest a lot of money and want the most long-term benefits. This comes from tax incentives and special operational privileges.

A Foreign Business License helps businesses that need to do activities not allowed by BOI or Treaty rules. This is especially for service sector operations that show clear benefits to Thailand’s economy.

The Treaty of Amity offers great benefits for American investors interested in forming limited companies in Thailand. It allows for quick setup and access to many sectors. Investors also receive national treatment status without the complications of other options.

Successful implementation requires early legal consultation, comprehensive documentation preparation, and strategic alignment between chosen pathway and business objectives. The regulatory landscape continues evolving, with new restrictions and benefits announced regularly, making expert guidance essential for optimal pathway selection and compliant implementation.

Each pathway provides real ways to succeed in foreign business in Thailand. The best choice depends on several factors. You need to consider your business needs. Look at the resources you have. Also, think about your strategic goals. This is important in Thailand’s changing investment environment.

LINKS : BOI Thailand