Tax for Foreign Business Owners in Thailand
Running a business in Thailand as a foreign owner involves navigating a genuinely structured, predictable tax system, but understanding where your specific company sits within it, and which obligations apply to you personally versus your company, matters considerably for accurate planning.
The standard rate, and the SME alternative
Thailand’s standard corporate income tax rate is 20% of net profit, applying to most Thai-incorporated companies and foreign companies genuinely carrying on business here. However, qualifying small companies, defined as having paid-up capital under 5 million THB and annual revenue under 30 million THB, benefit from a progressive rate structure instead: the first 300,000 THB of net profit is entirely tax-free, the next portion up to 3 million THB is taxed at 15%, and only profit exceeding 3 million THB attracts the full 20% rate. This progressive structure genuinely benefits smaller, earlier-stage businesses, a company earning 4 million THB net profit pays 0% on the first slice, 15% on the middle slice, and 20% only on the remaining 1 million THB, a considerably lower effective rate than the flat 20% headline figure might suggest.
Permanent establishment: why physical presence changes everything
Whether your business is taxed on net profit or subject to a flat withholding tax depends specifically on whether you have a genuine permanent establishment in Thailand, an office, employees, or an agent conducting business here, rather than simply where the company’s owners happen to be based. A foreign company with this kind of presence is taxed on its Thai-sourced net profit using the standard rate structure above. A foreign company without a permanent establishment, one simply receiving payments from Thailand without a physical operation here, is instead subject to a final withholding tax, generally 15% on most income types, 10% specifically on dividends, deducted at source by whoever is paying you.
Filing deadlines and the two-part payment structure
Corporate income tax returns (Form PND 50) must be filed within 150 days of the end of your accounting period, for a company with a 31 December year-end, this typically means a deadline around 30 May the following year. Beyond this annual filing, companies also submit a half-year return with a prepayment based on estimated annual profits, filed roughly midway through the accounting period, this prepayment is later credited against your final liability when the annual return is filed. Late filing carries fines of 1,000 to 2,000 THB plus a 1.5% monthly surcharge on any underpaid tax, worth avoiding through proper calendar tracking rather than discovering after the fact.
VAT: a rate that’s technically temporary
Thailand’s Value Added Tax stands at a reduced 7%, extended most recently by Royal Decree through 30 September 2026. It’s worth understanding that this is genuinely a temporary concession, the statutory rate under the Revenue Code is 10%, and businesses shouldn’t assume the reduced rate is permanently fixed. Businesses with annual revenue exceeding 1.8 million THB must register for VAT, filing monthly returns regardless of the specific rate in force at the time.
Withholding tax as an ongoing operational reality
Beyond your company’s own corporate tax, you’ll regularly withhold tax on certain payments your business makes, to employees, to contractors, to foreign entities receiving Thai-sourced income, filing the corresponding withholding tax return and remitting the withheld amount to the Revenue Department, generally within 7 days of the following month. This is an ongoing, regular compliance task rather than a once-a-year event, worth building into your business’s routine accounting rhythm from the outset.
Incentives worth exploring for the right kind of business
Thailand’s Board of Investment offers substantial incentives for businesses in promoted industries, technology, manufacturing, renewable energy, and digital services among them, including corporate income tax exemptions of up to 8 years for qualifying knowledge-intensive activities. If your business genuinely fits within a BOI-promoted category, this is worth exploring properly with a professional, since the potential tax savings can be genuinely significant over the exemption period.
Your personal tax obligations are separate from your company’s
This is worth being unambiguous about: your company’s corporate income tax and your own personal income tax on salary, dividends, or other income you draw from the business are entirely separate obligations. Paying your company’s corporate tax doesn’t reduce or substitute for what you personally owe on income you take out of the business, and both need proper, independent attention in your overall tax planning.
Final thoughts
Thailand’s corporate tax system is genuinely stable and predictable once you understand where your specific business sits, standard rate versus SME progressive structure, permanent establishment versus withholding-only status. Given how much the right structure and available incentives depend on your specific business model and growth trajectory, this is an area where proper accounting and legal guidance from the outset pays for itself many times over.
For guidance on your specific business tax structure, get in touch, or browse JLIT’s directory of accountants and business lawyers.
Key Takeaways
- Thailand's standard corporate income tax rate is 20% of net profit, but qualifying small companies, paid-up capital under 5 million THB and annual revenue under 30 million THB, benefit from a progressive structure starting at 0%.
- Under this SME structure, the first 300,000 THB of net profit is entirely tax-free, the next portion up to 3 million THB is taxed at 15%, and only profit beyond that is taxed at the full 20% rate.
- Whether a foreign-owned company is taxed on net profit or subject to a flat withholding tax depends on whether it has a genuine permanent establishment, an office, employees, or an agent, in Thailand, not simply on where the owners are based.
- Corporate tax returns must be filed within 150 days of the end of your accounting period, alongside a half-year prepayment based on estimated profits filed roughly midway through the year.
- Thailand's standard VAT rate is technically 10%, but a reduced 7% rate has been extended by Royal Decree through 30 September 2026; businesses shouldn't assume this reduced rate is permanent.
- As a business owner, your company's corporate tax and your own personal income tax on any salary or dividends you draw are entirely separate obligations, both need proper attention rather than assuming one covers the other.
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Frequently Asked Questions
What's the standard corporate tax rate for a foreign-owned business in Thailand?
20% of net profit for most companies. However, qualifying small companies, with paid-up capital under 5 million THB and annual revenue under 30 million THB, benefit from a progressive rate structure that can bring their effective tax rate down considerably, particularly in the early, lower-profit years of a business.
How does the SME progressive rate structure actually work?
The first 300,000 THB of net profit is taxed at 0%, entirely exempt. Net profit from 300,001 THB up to 3 million THB is taxed at 15%. Only net profit exceeding 3 million THB is taxed at the full 20% rate. A company earning 4 million THB in net profit, for example, pays 0% on the first slice, 15% on the middle slice, and 20% only on the final 1 million THB.
Does it matter whether my company has a physical presence in Thailand?
Yes, significantly. A foreign company with a genuine permanent establishment in Thailand, an office, employees, or an agent conducting business here, is taxed on its Thai-sourced net profit using the standard rate structure. A foreign company without this kind of presence is instead subject to a final withholding tax, generally 15% (10% for dividends), on Thai-sourced income paid to it.
When do I need to file my company's tax return?
Corporate income tax returns (Form PND 50) must be filed within 150 days of the end of your accounting period. You'll also need to file a half-year return with a prepayment based on estimated annual profits, submitted roughly midway through your accounting period, this prepayment is later credited against your final annual liability.
Is Thailand's VAT rate 7% or 10%?
Technically 10% under the Revenue Code, but a reduced 7% rate has been in place for years and was most recently extended by Royal Decree through 30 September 2026. It's worth treating this as a temporary concession that requires renewal rather than assuming it's permanently fixed at 7%.
Do I still pay personal income tax if my company already pays corporate tax?
Yes, these are entirely separate obligations. Your company pays corporate income tax on its profits; you separately owe personal income tax on any salary, dividends, or other income you personally draw from the business. One doesn't substitute for or reduce the other.
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Last Updated: June 2026