Siam Legal’s Income Tax Consulting
Avoid trouble with the Thai Revenue Department and keep more of your money

In the majority of cases, whether or not you must pay income tax in Thailand each year typically depends on two things: Where your income comes from and where you spend your time throughout the year.

If you get income from a Thai source, such as a salary from an employer, rents from investment properties, or profits from a Thai business, you must pay income tax on this money. Even if you live outside Thailand, this income is Thai-sourced and thus liable for taxation.

If you spend more than 180 days in Thailand out of a calendar year, whether consecutive or not, you are considered a “Thai tax resident.” This means you must pay income tax on both your Thai-sourced income and foreign-sourced income brought into Thailand.

If either of the above applies to you, you must file a personal income tax return with the Thai Revenue Department, or risk fines and even prosecution in extreme cases.

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  Previously, certain kinds of foreign-earned income could be taxed if it was brought into Thailand. The Thai government has since changed this rule, and foreign income can be exempted from Thai income tax if it is brought into the country within a certain timeframe. Contact our tax team to determine if your foreign income qualifies for exemption.
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  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.

If you need a Thai Tax Identification Number (TIN) to legally pay your taxes and avoid fines, Siam Legal makes the process fast and easy.

Our tax specialists can acquire a TIN for you so that you can save yourself a trip to the revenue department and avoid delays caused by mistakes. The process is simple:

1. Gather digital copies/scans of the required documents:
• Your passport biodata page (with your name, picture, passport number, etc.)
• Your current visa or visa exemption stamp (in your passport)
• Proof of address (Can be your lease/rental agreement or house registration book, AKA "blue book")
2. Fill out this form with your personal details and upload your required documents:
Fill out this form
3. Make your payment via the button below to confirm. If you need to use an alternate payment method, Contact Us and we will do our best to accommodate you:
Pay the fee

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.