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What to know about income tax in Thailand
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Previously, foreign-earned income would only be taxed if it was brought into Thailand the same year it was earned, so you could just wait a year to bring in money and avoid tax. However, the rule has been changed and that loophole is closed. Now any income that is earned from January 1, 2024 onward and brought into Thailand is taxable, regardless of when you bring it into the country. -
Before you can file a personal income tax return, as a foreigner, you must obtain a Tax Identification Number (TIN). This puts you into the system and enables you to pay your taxes. You cannot file without a TIN, though you can still be penalized for not filing, so make sure you get one well before the filing deadline (see below).
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The Thai tax year is the same as the calendar year. When the new year begins, you will need to file a tax return regarding all the income earned in the previous year, from January 1st to December 31st.
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The Thai tax season runs from January to the end of March. This is the period during which you must file your return, with the deadline being the end of March for hardcopy filings or the first week of April for online filings.
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You can file your return in person at the Revenue Department or online. There is an English language option when filing online, but the translations aren’t perfect and it’s easy to make mistakes when doing multiple calculations with various income streams. However, filing in person is not better, as it takes them much longer to process the paper documents, English language services are not guaranteed, and the staff will not help with calculations or deductions.
How can Siam Legal help you with your taxes?
Our tax consulting team offers a wide range of valuable services:
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Providing guidance on which of your income streams are taxable and what your tax responsibilities are.
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Advising on available tax deductions and credits to legally minimize your tax burden.
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Helping determine if the country of origin for your foreign income has a Double Tax Agreement (DTA) with Thailand and how to leverage this agreement to reduce your taxes.
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Solutions on what to do if you file late or incorrectly, in order to minimize your penalties.
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Assistance with obtaining a Tax Identification Number (TIN).
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Assistance with filing your personal income tax return to avoid mistakes, miscalculations, and overpaying.
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If you are an owner of a Thai business, we can also consult on corporate tax matters.
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Exploring options such as the Long-Term Resident Visa and Board of Investment Promotion for your business to further reduce your tax burden.
Why partner with Siam Legal for tax advisory services?
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20+ Years of Experience: Siam Legal has been helping foreigners in Thailand with all manner of legal, visa, and tax issues. Our decades of service prove we are trusted among the expat community to provide sound and effective service.
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Broad Tax Knowledge and Expertise: Our tax consulting team consists of Thai and expat professionals who have decades of experience and extensive knowledge of both Thai and international tax law.
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Keep More of Your Money: With our team’s deep understanding of Thai tax law and international tax law, we can find deductions, treaties, and other solutions that will enable you to pay less in tax and keep more of your hard-earned money. We will rigorously research the tax laws of your home country in the case of taxable foreign income to further reduce your tax burdens by all legal means.
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Diverse Service Offerings: Siam Legal’s multiple legal and visa consultancy teams mean you can get a wide range of needs met by trusted professionals without having to shop around and visit multiple consultants. From document notarization and translation to contract review to courtroom representation, we provide a long list of valuable services.
Don’t risk late fees and more serious penalties from the Thai Revenue Department. Partner with Siam Legal’s expert tax consultants to eliminate your tax worries and keep as much of your hard-earned money as possible.
Meet Siam Legal’s Tax Consulting Team
Siam Legal is a full-service law firm and tax consultancy with over 20 years of experience. In addition to our corporate, property, litigation, and family law teams, we have a tax advisory team comprised of both local Thai and international tax experts led by Mikkel Karlsen.
Mikkel Karlsen
Tax and Legal Consultant
Mikkel Karlsen is an experienced legal consultant, specializing in International Tax Law and Family Law. He holds a Bachelor of Laws from the University of Lincoln, England, and brings with him professional experience from several countries across Europe and Asia. Having previously worked at an international law firm in Thailand, Mikkel has gained the knowledge and problem-solving skills needed to tackle legal issues of multi-national nature.
Chiara Budelli
Senior Associate
Chiara Budelli is a results-oriented legal professional specializing in corporate law, civil disputes, and immigration. With extensive experience in contract drafting, negotiation, and dispute resolution, she provides strategic legal advice that protects and advances her clients' interests. As a flexible and versatile problem solver, Chiara is committed to delivering precise, efficient, and legally sound solutions tailored to her clients' needs.
Pia-on Jones
Tax and Legal Consultant
Pia-on Jones is a dedicated legal professional specializing in domestic and international tax law. With a Master’s degree in International Tax from Melbourne University and extensive experience in domestic and cross-border taxation and compliance, they provide strategic legal solutions that help clients navigate complex tax regulations. Pia-on’s meticulous and results-focused approach enables them to provide clear, efficient, and effective tax strategies customized to each client’s needs.
Proud Member of:
Siam Legal is a proud and active member of the American Chamber of Commerce.
Siam Legal is a proud and active member of the British Chamber of Commerce in Thailand.
Siam Legal is a proud and active member of the Australia Chamber of Commerce in Thailand.
Our Offices in Thailand
Bangkok Office
- 18th Floor, Unit 1806 Two Pacific Place, 142 Sukhumvit Rd, Khlong Toei, Bangkok, Thailand
Phuket Office
- 123 / 27-28 Moo 5, Bangtao Place T. Cherngtalay, A. Thalang, Phuket 83110
Chiang Mai Office
- Curve Mall 2nd floor Room C219-C220, 215/2 Chang Klan Road, Mueang, Chiang Mai, 50100, Thailand
Ready to put your tax worries to rest?
Connect with Our
Expert Tax Consulting Team
We offer:
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Advising on your tax responsibilities and assessable income
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Assistance with identifying deductions and credits you qualify for
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International tax consulting to minimize tax burden
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Assistance with applying for a TIN and filing your personal tax return
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Thai corporate and business tax consulting
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