Sole Proprietorship Get Started
We believe that great legal representation starts with genuine care for our clients. Whether you’re running a business, or dealing with a personal issue, our focus is simple: to help you move forward with clarity and confidence. We blend experience with a client-led mindset, delivering legal guidance that’s clear, practical, and built around your best interests.
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What is a Sole Proprietorship?
A sole proprietorship is the simplest way to run a business in Thailand: one owner, full control, and a single layer of registration rather than the structure of a limited company. It suits small, lower-risk operations where the owner is the business.
The trade-off is that there's no legal separation between you and the business, so you're personally responsible for its debts and obligations. It's also limited for foreigners, under the US Treaty of Amity and/or those married to Thai citizens. Below we explain how it works, who it's suited to, and what's involved in setting one up.
THE RIGHT SET UP
Benefits of a Sole Proprietorship
Simplicity
One owner, minimal paperwork, and a faster setup than a limited company.
Cost Efficient
Low running costs, with the option to register your home as the business address.
Simplified Accounts
Profits are taxed as personal income, so there's no separate corporate filing to manage.
KEY CONSIDERATIONS:
Sole proprietorships for foreigners also require a Foreign Business License as well. They also do not provide liability protection; the owner is personally responsible for all business obligations. It’s recommended to consult a legal expert to ensure compliance with Thai laws and determine the most suitable structure for your business.
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Who Can Apply
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THAI NATIONALS
Thai citizens can freely register and operate a sole proprietorship in their own name.
FOREIGNERS MARRIED TO THAIS
Foreign nationals married to Thai citizens can set up a sole proprietorship under their spouse’s name. This arrangement allows the foreigner to be involved in the business while complying with Thai legal requirements.
US CITIZENS
U.S. nationals can open a sole proprietorship in Thailand under the U.S.-Thai Amity Treaty. This treaty provides them with unique privileges to own and operate certain types of businesses in Thailand.
WHAT TO EXPECT
Application Process
- Name Registration: Submit name options to the Department of Business Development (DBD) office.
- Prepare identification documents, house registration for intended address and photos of the signage.
- Document Submission: Upload required documents through the DBD e-registration portal to obtain a Certificate of Incorporation.
- Register for a tax ID, as well as VAT if applicable.
- Stay Compliant: Maintain accounting records and submit personal income tax monthly.
TRUST AND ACCOUNTABILITY
What Clients Say
LUKAS KIRCHBERGER
Very professional and reliable law firm with excellent communication. They were clear, responsive, and provided practical legal advice without unnecessary complications. I felt well supported throughout the entire process and can highly recommend Attori Law to both individuals and businesses seeking legal assistance in Thailand.
SANKET VELHAL
I was handling a complicated situation around Thai business compliance + immigration/Non-B visa process, with deadlines and a lot of moving parts. Their team stayed calm, explained things clearly, and gave me realistic options instead of false promises... ... If you’re an expat or business owner in Thailand and you need help with visa/work permit, company filings, or compliance, I would definitely recommend Attori Law. They know what they’re doing and they treat clients with respect.
TRYSTAN TRESTCHENKOFF
Me and my partner registered a company with Attori and for now the service is reliable, good and on time. I recommend them to anyone willing to register a company in Thailand.
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Common mistakes and reasons for rejection
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Assuming any foreigner can apply
Sole proprietorship is only open to Thai nationals, US citizens under the Treaty of Amity, or a foreign spouse registering under their Thai partner's name. Applying outside these categories gets rejected outright.
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Choosing a restricted business activity
Some activities stay restricted or licensed no matter who owns the business. Sole proprietor status doesn't bypass this.
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Submitting incomplete registration documents
Missing identification, address proof, or required forms is one of the most common causes of delay or rejection.
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Assuming registration alone lets you work
A foreigner still needs a valid work permit to legally operate the business. Registration by itself doesn't cover this.
GET THE CORRECT SET UP
Comparing Structures
Choosing the right structure is the first decision for any foreigner doing business in Thailand. The main routes to majority foreign ownership are an FBL, BOI promotion, the US Treaty of Amity for Americans, or a Thai Limited Company. The table compares them on ownership, work permits, capital, and timeline.
| Category: | Foreign Business License (FBL) | Board of Investment (BOI) | Thai Limited Company | Treaty of Amity |
|---|---|---|---|---|
| Foreign Ownership | Yes | Yes but FBL is tied to the project | Max 49% | Up to 100% for US citizens and companies |
| Work Permit Requirements | 4 Thai employees per work permit | No restrictions | 4 Thai employees per work permit | 4 Thai employees per work permit |
| Who Can Apply | All foreign nationals in qualifying fields | Projects falling under BOI promoted categories | All | US citizens or companies only |
| Minimum Registered Capital | 3 million baht (paid up over first 3 years) | Project dependent | No minimum capital | 3 million baht |
| Application Timeline | 6 to 9 months | 4-6 months depending on project complexity | 1-2 weeks | 6 to 9 months |
| Benefits | Not tied to project and can be applied for by anyone | Fast track visas, tax holidays, low barriers for foreign workers | Easy to set up and maintain | Same as FBL but easier to get certified |
| Roadblocks | Can be rejected or delayed with tougher guidelines | Must maintain project to keep BOI and benefits active | Does not allow foreign ownership except in a few specific areas. | US nationals only; no other benefits apart from ownership |
FAQs
Can a foreigner register a sole proprietorship?
Only in two situations. US citizens can register one under the Treaty of Amity. A foreigner married to a Thai national can have one registered in their spouse's name, though that means the business belongs to the spouse rather than to them. Everyone else needs a company structure, usually a Thai limited company.
Does registering one let me work in the business?
No, and this catches people out. Registration establishes the business. Working in it is separate, and a foreigner still needs a visa and a work permit. Owning the business does not exempt you from that, and the two applications have different requirements.
What are the tax obligations?
Profits are taxed as personal income rather than corporate income, so there is no separate company filing. You will need a tax ID, and VAT registration once turnover passes the threshold. Accounting records still have to be kept, simpler than a company's but not optional.
Am I personally liable for the business?
Yes, entirely. There is no legal separation between you and the business, so its debts and obligations are yours. That is the real trade-off for the simplicity, and it is the main reason to consider a limited company instead if the work carries any meaningful risk.
Can I use my home as the business address?
Usually yes, and it is one of the reasons running costs stay low. You need the house registration document for the address, or a signed letter of consent from the owner if it is not yours. Some licensed activities require premises that can be inspected, so check before assuming it works for your business.
Can I hire employees?
Yes. Once you do, you take on employer obligations including social security registration and contributions. Those are the same duties a company carries, so hiring is often the point at which the simplicity advantage starts to disappear.
Can I turn it into a limited company later?
Not by converting it. A sole proprietorship cannot be changed into a limited company, so you register a new company and move the business across, then close the sole proprietorship. Contracts, licences, the tax ID and bank arrangements all have to be redone rather than carried over. If you expect to want the liability protection or to bring in investors, it is usually cheaper to start as a company than to move later.