The US–Thai Amity Treaty: What It Lets Americans Actually Do

Can an American own and operate a business in Thailand without a Thai majority partner? In many covered industries, the US Thai Amity Treaty can let eligible US citizens and US-owned companies hold a majority stake or even 100% ownership, instead of following Thailand’s usual foreign-ownership limits.

That benefit has clear boundaries. The treaty isn’t a visa, tax break, or blanket business license, and it doesn’t cover communications, transport, deposit-taking banking, fiduciary services, land or natural-resource exploitation, or domestic trade in indigenous agricultural products. You’ll also need certification through the US Commercial Service at the US Embassy in Bangkok and Thailand’s Department of Business Development, followed by any required sector licenses, registrations, tax filings, and ongoing compliance.

The sections ahead explain what the treaty allows, which businesses it excludes, and how the certification process works under the rules and practical guidance available in 2026.

Key Takeaways

• Eligible US citizens and US-owned companies may hold a majority stake or 100% of a Thai business in covered industries.
• Treaty protection can apply to services, consulting, software, restaurants, retail, education, and some professional practices.
• The treaty excludes communications, transportation, deposit-taking banking, fiduciary services, land ownership, natural-resource exploitation, and domestic agricultural trade.
• Applicants must prove US ownership and control, obtain certification, and register with Thailand’s Department of Business Development.
• Review the US Embassy business FAQs before relying on treaty rights for a specific business.

What the US-Thai Amity Treaty Lets Americans Actually Do

The Treaty of Amity and Economic Relations gives qualifying Americans a different ownership path in Thailand. Signed on May 29, 1966, and effective since June 8, 1968, it remains an active legal framework unless either country ends it with proper notice. Its central idea is national treatment, which means eligible US citizens and US-majority-owned and controlled companies can receive treatment similar to Thai businesses in many covered activities.

That benefit works alongside Thai law. The treaty does not replace the Foreign Business Act, erase licensing rules, or turn every business into an unrestricted activity. An American owner still needs the required Thai registrations, permits, tax filings, and treaty certification before operating.

Why National Treatment Changes the Usual Foreign Ownership Rule

Ordinary foreign investors often face ownership caps under the Foreign Business Act. Depending on the business category, they may need a Thai majority partner or a Foreign Business License before providing services in Thailand.

A qualifying American company may instead own up to 100 percent of a Thai company in many permitted sectors. For example, an American consulting firm could establish a Thai company that it owns and controls outright, then apply for recognition under the treaty. A US technology services company may have a similar option if its activities fall within a covered category.

The ownership benefit isn’t automatic. The company must prove its American ownership and control, obtain certification through the US Embassy’s business guidance, and complete the Thai Ministry of Commerce process, including the Foreign Business Certificate where required.

Treaty protection answers the ownership question, but it doesn’t automatically grant permission to perform the business activity.

That distinction matters for regulated fields. A wholly American-owned company may still need a professional license, sector approval, work permits, or other authorization. Some activities are also excluded from treaty protection, including land ownership, communications, transportation, deposit-taking banking, fiduciary services, natural-resource exploitation, and domestic trade in indigenous agricultural products. Before forming the company, match the planned activities to both the treaty exclusions and Thailand’s licensing rules.

Who Qualifies and Which Businesses Can Use Amity Protection

The treaty is most useful for eligible operating companies, professional services firms, qualifying trading structures, and other businesses that fall within covered activities. However, eligibility depends on genuine American ownership and control, not simply placing a US citizen’s name on company paperwork.

The Ownership and Control Evidence Officials Review

Treaty applicants commonly need to provide records that show who owns and controls the company. These may include:

• Articles of incorporation or organization, bylaws, and operating agreements.
• The Thai company’s registration certificate, memorandum, objectives, and shareholder list.
• Shareholder names, nationalities, addresses, shareholdings, and ownership percentages.
• Director details, including each director’s nationality and the people authorized to bind the company.
• Passports or other proof of US nationality for major American shareholders.
• Parent-company records when a US corporation owns the Thai applicant.
• Affidavits, corporate certificates, and notarized documents.
• Certified English translations for Thai-language records when officials require them.

A company will commonly need to show at least 51% American ownership, along with American management and practical control. Officials may examine who appoints directors, who can sign contracts, who controls bank accounts, and who makes operating decisions. The US Embassy Commercial Service reviews the American side of the application, while Thailand’s Department of Business Development handles the Thai registration process.

The exact director, signatory, notarization, and translation requirements depend on the proposed structure. Confirm them with the US Embassy’s current business FAQ and the Thai Ministry of Commerce before incorporating.

A nominee shareholder arrangement is not a safe shortcut. If Thai shareholders appear on paper while an American owner secretly controls the company, officials may question or reject the application. The ownership records, management structure, and actual business operations should tell the same story.

The Six Areas the Treaty Does Not Open Up

Treaty status does not create a right to operate in these excluded areas:

1. Communications, including restricted inland communications activities.
2. Transportation, including covered inland transport operations.
3. Fiduciary services, where the business holds or manages assets for others.
4. Deposit-taking banking, including depository functions.
5. Land or natural-resource exploitation, including general land ownership.
6. Domestic trade in indigenous agricultural products.

No level of American ownership removes these exclusions. Land ownership is not a general Amity benefit, and qualifying ownership does not replace sector licenses, professional approvals, or other Thai operating requirements. A business may pass the ownership test and still need separate permission for its specific activities.

How to Get a Treaty of Amity Company Approved in Thailand

Treaty status isn’t automatic. A US-owned business normally starts by forming and registering a Thai company, then obtains US ownership certification, and finally applies to Thailand’s Ministry of Commerce for recognition and a Foreign Business Certificate.

Documents, Translations, and Government Offices Involved

First, register the Thai company with the Department of Business Development (DBD) under Thailand’s Ministry of Commerce. The company should have its registration certificate, memorandum, objectives, shareholder list, director information, and other original documents used during registration.

Next, prepare the documents for the US Embassy Commercial Section in Bangkok, also referred to as the US Commercial Service. The submission usually includes:

• Original Thai company registration documents.
• Accurate English translations of Thai-language records.
• Shareholder and ownership records showing the required American ownership.
• Passports or corporate documents proving the identity and nationality of US owners.
• Additional affidavits, notarizations, or evidence requested by the Embassy.

The Embassy reviews the ownership and control structure before issuing a certification letter. Officials may ask for evidence about the American shareholders, parent company, directors, authorized signers, and practical control of the business. Review the US Embassy business FAQs before preparing the file.

After certification, submit the application to the DBD’s Foreign Business Administration Division for recognition under the treaty and issuance of the Foreign Business Certificate. The DBD also lists treaty-based certificates under its electronic foreign business filing system.

Administrative details can change, including forms, appointment rules, translation standards, fees, office addresses, and processing times. Confirm the current requirements with the Department of Business Development and the Embassy before paying fees or arranging an appointment.

What Happens After Certification

Once the US Commercial Service and Thai authorities accept the application, the company can receive recognition as a US Treaty of Amity company. For covered activities, that recognition may allow the business to operate without the ordinary Foreign Business License that would otherwise apply to a foreign-owned company.

The certificate doesn’t remove the company’s other legal duties. After approval, the business may still need to complete:

• Thai tax registration and tax filings.
• Accounting and annual reporting requirements.
• Social Security and employment registrations.
• Work permits and visas for foreign employees.
• Industry-specific licenses or professional approvals.
• Local permits for premises, signage, health, safety, or construction.

The company must also continue meeting the treaty’s ownership and control requirements. If ownership changes, directors are replaced, or the business expands into a new activity, review whether the certificate and related approvals still cover the company’s operations.

What Amity Does Not Give You: Visas, Tax Breaks, or Unlimited Market Access

The US-Thai Amity Treaty mainly addresses ownership and market access. It doesn’t give an American the automatic right to live in Thailand, work there, avoid taxes, or operate in every industry.

Americans Still Need the Right Visa and Work Permit

Treaty status doesn’t let an American live or work in Thailand by itself. Founders, directors, and employees who perform work in Thailand must follow the applicable immigration and labor rules.

In many cases, that process involves a Non-Immigrant B visa and a Thai work permit. The Thai eVisa requirements for Non-Immigrant B applicants outline the separate visa application process. A company may also need to meet conditions related to its registration, capital, employees, and business activity before it can support a foreign worker’s application.

Company eligibility and personal immigration permission are separate questions. An American-owned company may qualify for treaty protection, while its owner still needs the correct visa and work authorization. Likewise, holding a director position doesn’t automatically authorize someone to perform day-to-day work in Thailand.

Taxes, Paid-Up Capital, and Business Licenses Still Apply

The treaty doesn’t provide a blanket income tax exemption or a special tax holiday. A treaty company generally remains responsible for Thai corporate income tax, VAT when applicable, payroll obligations, accounting, filings, and other routine business duties.

There is also no single universal Amity paid-up capital minimum that applies to every business. Capital requirements can depend on the proposed activity, the company’s foreign status, work-permit needs, and other Thai rules. Confirm the requirements for the specific activity before forming the company.

Ordinary operating approvals still matter as well. Depending on the business, you may need a professional license, health or safety approval, local permit, industry registration, or other sector authorization. Treaty certification protects an eligible ownership structure, but it doesn’t replace those approvals.

Amity Compared With a Foreign Business License or BOI Promotion

These routes solve different problems:

A Foreign Business License is often the standard route when a business isn’t covered by Amity or doesn’t meet its ownership and control requirements. The US State Department’s Thailand investment guidance confirms that treaty protection doesn’t remove every investment restriction.

The Board of Investment is a separate program. Qualifying projects may receive tax benefits, permission for foreign ownership, land-related privileges, or visa and work-permit facilitation. BOI promotion doesn’t automatically grant treaty status, and Amity status doesn’t automatically qualify a project for BOI incentives.

Your best route depends on the ownership structure, industry, planned activities, incentive needs, and long-term business plan.

Is the Treaty Right for Your Thailand Business?

The US-Thai Amity Treaty can be a strong ownership option, but it is not the right fit for every American founder. Before committing capital, test the business activity, ownership structure, licensing needs, immigration plans, and tax obligations separately.

The Biggest Mistakes American Founders Should Avoid

The first mistake is assuming the treaty covers every industry. It does not protect businesses in excluded areas such as communications, transportation, deposit-taking banking, fiduciary services, land or natural-resource exploitation, and domestic trade in indigenous agricultural products. Profession-specific restrictions may also apply.

Never use Thai nominee shareholders to create the appearance of Thai ownership or control. The government prohibits nominee arrangements used to bypass foreign-ownership rules, and Thailand’s nominee shareholder guidance explains the risk. Your real ownership, management rights, voting power, and financial control must match the documents submitted for certification.

Treaty certification also is not a work permit. An American director or employee still needs the appropriate immigration status and work authorization before performing work in Thailand. Similarly, Amity approval does not replace tax registration, VAT obligations, payroll compliance, or industry licenses.

Thai-language documents create another common problem. Registration records, shareholder information, company objectives, and other filings may need accurate English translations, notarization, or certification. Budget time for document preparation instead of assuming an English-language application will be accepted without review.

Finally, don’t promise approval before checking the exact business activity. A US-owned consulting firm that provides management advice may benefit if its ownership and operations meet the treaty rules. A land-based development company, licensed professional practice, or regulated financial business may need a different structure or approval route.

Use this short pre-filing checklist:

1. Confirm that every planned activity falls outside the treaty exclusions and profession-specific restrictions.
2. Map the ultimate US ownership and actual control, including any parent companies.
3. Identify licenses, permits, and registrations that apply beyond ownership approval.
4. Budget for certification, translations, legal advice, accounting, and government fees.
5. Plan visas, work permits, Thai tax filings, and employment compliance as separate projects.

A Thai lawyer or qualified business adviser should review the exact structure and activities before you sign a lease, transfer funds, or incorporate.

Frequently Asked Questions

The treaty raises practical questions that ownership rules alone don’t answer. These are the issues to resolve before changing shareholders, signing a property deal, or choosing a business structure.

Does a US green-card holder qualify for Amity protection?

Generally, no. Treaty eligibility focuses on US citizenship, not US permanent-resident status, so holding a green card alone doesn’t satisfy the nationality requirement. A dual citizen may qualify by relying on their US citizenship, subject to proof of nationality and the company’s ownership and control structure.

Can Thai heirs inherit shares in an Amity company?

Inheritance can affect treaty status if it changes the ownership chain. A Thai heir may receive shares under a will or applicable succession rules, but the company still needs to maintain the required US majority ownership and control. Before preparing estate documents, ask a Thai lawyer to review how the transfer could affect the company’s treaty certification.

Can a treaty company sell shares to Thai investors?

Yes, but the company must continue meeting the treaty’s ownership and control tests. If US ownership falls below the required majority, or American control of the board is lost, the company may no longer qualify for treaty protection. Report proposed share transfers to the company’s advisers before completing them, rather than treating the change as ordinary corporate housekeeping.

Can an Amity business operate through a branch office?

A qualifying US business may use a branch office in Thailand for many covered activities. However, the branch still needs the required Thai registration and must satisfy the treaty’s US ownership and control requirements. The structure also doesn’t remove activity-specific licenses, tax filings, work permits, or local operating approvals. The US Embassy’s treaty business FAQs explain the certification framework for eligible US businesses.

Can an Amity company buy land or a villa in Thailand?

No. Treaty status doesn’t give an American or an Amity company a general right to own Thai land, including land beneath a house or villa. A business may explore lawful arrangements such as a registered lease, a superficies right, or a condominium purchase within Thailand’s foreign ownership quota, but each option needs separate legal review.

Does treaty protection cover a new business activity automatically?

No. Certification relates to the company and its approved activities, not every service the company might later offer. If you add consulting, retail, education, software development, or another business line, check the treaty coverage, company objectives, licensing rules, and Foreign Business Certificate before starting that work. Operating outside the approved scope can create regulatory and certification problems.