Company Incorporation

US Treaty of Amity Company Registration

We help US-owned businesses register a Treaty of Amity company in Thailand, including eligibility review, Embassy certification coordination, Ministry of Commerce filings, and post-registration compliance setup.

Who is it for / Suitable for

US citizens or US majority–owned companies seeking to operate in Thailand.

Businesses wanting to enjoy national-treatment privileges, allowing 100% US ownership in most service and trading activities.

Ideal for SMEs, tech companies, consulting firms, and service businesses expanding into Thailand.

Key Requirements

Company must be at least 51% US-owned and majority controlled by US citizens/entities.

At least one US director with signing authority.

Must obtain both: Company Registration (Thai Limited Company or Branch) and Amity Certification from the US Embassy + Foreign Business Certificate (FBC).

Paid-up capital typically 2 million THB (or more depending on activity).

Business activities must not fall under restricted sectors (e.g., land ownership, communications, transport, etc.).

Clients need to provide the following information / documents

Document Name

Notarized

Passports of all US shareholders & directors

Must clearly show nationality

Proof of US shareholding structure

For companies: share certificates, company structure chart

Yes

US Company registration documents (if shareholder is a company)

Certificate of Incorporation, Articles

Yes

Signed letter requesting Amity certification

Required by US Embassy

Thai Company Name Reservation

3 preferred names

Thai shareholder & director IDs (if any)

Required only if mixed shareholding

Office lease agreement (if available)

Needed before FBC issuance

Company objectives & activity outline

Must align with permitted Amity activities

Average Processing Time

4–8 weeks

Depending on Embassy certification and Ministry of Commerce approval.

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What you would get when the application is complete

US Treaty of Amity Certification (from US Embassy)

Foreign Business Certificate (FBC) permitting operation under Amity

Thai Company Registration Documents

Tax ID Number & VAT Certificate (if applicable)

On-going Compliance Requirements

To keep your company compliant after registration:

Annual audited financial statements

Monthly tax filings (VAT, withholding tax, corporate income tax)

Maintain US majority ownership at all times

Notify Ministry of Commerce of any structural changes (e.g., directors, shareholders, address)

Maintain proper Thai accounting records and statutory books

Government Agencies Involved

Government agencies who are involved / oversee this application:

U.S. Embassy in Thailand – Commercial Section

Issues the Letter of Certification confirming that the company is majority-owned by U.S. citizens and it qualifies for Treaty of Amity privileges.

Department of Business Development (DBD), Ministry of Commerce

Registers the Thai company, reviews corporate structure and U.S. ownership, and ensures compliance with local company regulations.

Ministry of Commerce – Foreign Business License Division

Issues the Foreign Business Certificate (FBC) under the Treaty of Amity and authorizes the company to operate with U.S. national treatment privileges.

Revenue Department (RD)

Oversees tax registration (Tax ID / VAT registration) and ensures compliance with Thai tax laws.

Social Security Office (SSO) (if hiring employees)

Oversees employer registration and ongoing payroll compliance.

Bank of Thailand (BOT)

May be involved if the company’s activities fall under financial services or regulated sectors.

Thanks SiamBusinessLaw to helping us draft a strong agreement and help us see through the case until we have an absolute win case. Appreciate your patience and professionalism

Your law firm handles our case very well and professional. Your regular updates allow us a peace of mind an dmake us feel like we are cared for. Your professional advise gave us a peace of mind too.

Your Burmese team is legit. They gave us the attention and respect we have long missed. We appreciate your work to help us get started properly here in Thailand.

Thank you for assisting us with our case with the Thai Revenue Deparment. We are satisfied with the outcome and we think it is fair.

Your due diligence work for our M&A is done with utmost care and accuracy. It's rare to see such work done by a legal firm in Thailand.

Consult With Our Corporate Advisory Team

Our team is ready to guide you through the full process. Reach us on WeChat or WhatsApp.