Tax in Thailand

Who is the tax authority in Thailand?

The Revenue Department (กรมสรรพากร, Krom Sapphakon) under the Ministry of Finance is the principal Thai tax authority [SC1]. The Revenue Department administers personal income tax (Phasi Ngoen Dai Bukkhon Thammada), corporate income tax (Phasi Ngoen Dai Nitti Bukkhon), value-added tax (Phasi Mun Kha Phoem, VAT), and Specific Business Tax (Phasi Thurakit Chapho) for certain financial-and-real-estate transactions. The Customs Department (Krom Sulakakon) handles customs administration. The Excise Department (Krom Sappasamit) administers excise duties on alcohol, tobacco, automotive, fuels, and other specified categories. Tax disputes proceed through the Tax Court (San Phasi Akon) — the dedicated specialised tax court — with appeal to the Supreme Court of Justice. Certified Public Accountants (CPA) regulated by the Federation of Accounting Professions (FAP) under the Accounting Profession Act 2004 are the principal credentialed accounting profession; tax-licensed accountants registered with the Revenue Department's accounting registry handle bookkeeping and basic compliance. The Revenue Department's e-Filing portal at rd.go.th handles online tax filings and the Personal Tax Calculation system; the Revenue Department also operates the Phra Khanong One Stop Service centre and provincial Sapphakon Pak (Revenue Branch) offices for in-person assistance.

What is the Thai tax year and the filing deadline?

The Thai personal tax year is the calendar year (1 January to 31 December). Individual filers submit PND 90 (general individual return covering self-employment, business, rental, capital gains, and other categories) or PND 91 (employment-only individual return for filers with only Section 40(1) employment income) by 31 March of the following year [SC2]. Online filing via the Revenue Department's e-Filing portal extends the deadline to early April (typically 8 April; subject to annual notice from the Revenue Department). Most salaried filers whose income is fully covered by employer monthly Phasi Hak Na Thi Chai (Section 50 withholding) still must file the annual return — Thailand does not operate an automatic-assessment framework analogous to UK PAYE.

Self-employed and corporate filers make Phasi Banthuek (provisional half-yearly tax) instalments — PND 94 by 30 September of the current tax year (covering January-June revenue) and final reconciliation by 31 March of the following year. Companies file the annual PND 50 (corporate income tax return) within 150 days of fiscal year-end (30 May for calendar-year filers). VAT returns (PP 30) are filed monthly by the 15th of the following month for paper filers / 23rd for online filers. Specific Business Tax (PT 40) returns also filed monthly. Late filing of Thai tax returns triggers a fine of THB 200 for each missed return + monthly surcharge of 1.5 percent on unpaid tax. Tax-evasion offences under the Revenue Code escalate to criminal jurisdiction with imprisonment for serious cases.

How is Thai tax residency determined?

Under the Thai Revenue Code, an individual is a Thai tax resident if they are physically present in Thailand for 180 days or more in a calendar year [SC3]. Thai tax residency triggers worldwide-income taxation. The 180-day test is mechanical day-counting; partial days counted. Once resident, an individual remains resident for the entire calendar year (no part-year resident framework). Treaty residency tie-breakers under Thailand's DTC network apply for dual-residency scenarios and can override domestic 180-day classification.

From 1 January 2024 — under the post-2023 reform via Departmental Order 161/2023 (Por 161/2566) and clarifying guidance Por 162/2566 — Thailand moved to a remittance basis for foreign-source income earned by Thai-resident individuals. Foreign-source income earned in or after 2024 is taxable in Thailand only when remitted to Thailand. The framework abandoned the long-standing prior interpretation that exempted foreign-source income that was not remitted in the same calendar year as earned [SC3]. The reform materially expanded Thai tax exposure for resident filers with foreign-source income — particularly affecting Thai-resident foreign expatriates with overseas-investment-portfolio holdings and Thai citizens working abroad with remittance-back patterns. Por 162/2566 clarified that foreign-source income earned in or before 2023 retains the prior framework and remains exempt if not remitted in the year earned.

The Long-Term Resident Visa (LTR) programme provides partial offset for qualifying high-net-worth filers. Highly-Skilled Professional LTR category provides a 17 percent flat tax on Thai-source qualifying employment income for up to 10 years. Wealthy Global Citizen + Wealthy Pensioner + Work-from-Thailand Professional categories offer favourable visa-status without the flat-tax rate. The LTR programme launched in September 2022 has materially shifted Thailand's positioning for inbound HNW + remote-working expats. Thailand does not operate a comprehensive exit tax framework; emigration of Thai-resident individuals does not trigger deemed-disposition tax events under existing law.

How does Thai personal income tax work?

Thai personal income tax operates on a graduated bracket structure. Rates for 2025: 0 percent up to THB 150,000 (effective tax-free threshold combining the 0-bracket plus standard deductions); 5 percent on THB 150,001-300,000; 10 percent on THB 300,001-500,000; 15 percent on THB 500,001-750,000; 20 percent on THB 750,001-1,000,000; 25 percent on THB 1,000,001-2,000,000; 30 percent on THB 2,000,001-5,000,000; 35 percent above THB 5,000,000 [SC2]. The 35 percent top rate applies to taxable income above approximately USD 137,000 at typical exchange rates.

Income categories under Section 40 of the Revenue Code: 40(1) employment; 40(2) hire-of-services from independent contracts (specific categories); 40(3) goodwill, copyright royalties, IP-licence fees; 40(4) interest, dividends, capital gains, gains from share-of-business; 40(5) rental income and consideration for transfer of ownership; 40(6) liberal-professional income (medicine, law, engineering, architecture, accounting, fine arts); 40(7) construction-and-related contracts; 40(8) other business activities. Different deduction percentages apply per category — e.g. Section 40(1) employment up to THB 100,000 / 50 percent cap; Section 40(2)-(8) various standard-deduction percentages.

Specific deductions and allowances: personal allowance THB 60,000; spouse allowance THB 60,000 (where spouse has no income or low income); child allowance THB 30,000 per child (additional THB 30,000 for each second-child-and-onwards born from 2018); parental allowance THB 30,000 per parent if parent is over 60 and own income below threshold; provident-fund contributions up to 15 percent of income with cap THB 500,000; mortgage-interest deduction up to THB 100,000; life-insurance premium deduction up to THB 100,000; charitable-and-temple contributions various; Long-Term Equity Fund (LTF, sunset 2019) and Super Savings Fund (SSF) up to 30 percent of income with cap THB 200,000.

Capital gains for Thai-resident individuals on listed Thai-securities sold through SET (Stock Exchange of Thailand) brokers are exempt under Section 42(17) Revenue Code — the long-standing exemption that has been the subject of multiple legislative review proposals (most recently 2024) but remains in force. Capital gains on real-estate are taxed under separate-taxation regime with progressive rates and time-of-holding allowances; sale-of-real-estate withholding by Land Department at 1 percent on consideration as final-tax option.

How does Thai corporate tax work?

The Thai corporate income tax (Phasi Ngoen Dai Nitti Bukkhon) standard rate is 20 percent on taxable profits, applicable to most Thai-resident corporations and to permanent establishments of foreign corporations [SC2]. Small Companies (registered capital up to THB 5 million AND annual revenue under THB 30 million) face graduated rates: 0 percent on first THB 300,000 of taxable profit; 15 percent on next THB 2,700,000; 20 percent above THB 3,000,000.

Specific incentive regimes: Board of Investment (BOI) promotion provides corporate-tax exemption for up to 8 years (extendable to 13 years for specified high-impact activities) for qualifying promoted activities — Thailand 4.0 framework targets digital, robotics, biotechnology, healthcare, food-processing, alternative-energy, and advanced-manufacturing sectors. Eastern Economic Corridor (EEC) zone-based reductions provide additional 50 percent reduction on standard corporate-tax rate for qualifying activities in EEC provinces (Chonburi, Rayong, Chachoengsao). International Business Centre (IBC) regime providing 8 percent / 5 percent / 3 percent reduced rates depending on qualifying spend levels (THB 60m / 300m / 600m+ on qualifying-business-expenditure thresholds).

Thailand implemented OECD Pillar Two Global Anti-Base Erosion (GloBE) rules through the Top-up Tax Act effective for fiscal years beginning on or after 1 January 2025 for groups with consolidated revenue above EUR 750 million [SC4]. The Thai Pillar Two framework includes Domestic Minimum Top-up Tax + Income Inclusion Rule. The Thai CFC regime is limited; specific anti-avoidance provisions under the Revenue Code substitute for comprehensive CFC framework. Withholding on outbound dividends 10 percent (15 percent if not subject to the local 50 percent dividend exemption); interest 15 percent (some categories 10 percent); royalties 15 percent; technical-services fees 15 percent — most reduced under bilateral treaties.

How does indirect tax work in Thailand?

Value-Added Tax — VAT (Phasi Mun Kha Phoem) — is the principal indirect tax. The standard rate is 7 percent (the legally-prescribed rate is 10 percent under section 80 of the Revenue Code, but the rate has been reduced to 7 percent by Royal Decree on a year-by-year basis since 1999 — most recently extended through 30 September 2025) [SC2]. The continuing 30+ year extension cycle has effectively normalised the 7 percent rate as Thailand's de-facto standard. Politicians periodically discuss raising to 10 percent under fiscal-consolidation arguments; reform attempts have not succeeded.

The zero rate applies to exports of goods, certain international-services exports, and the supply of low-value-services to foreign-airline operators. The exempt category covers most basic-foodstuffs (unprocessed agricultural products, certain animal feeds, fertiliser, pesticides), educational services, healthcare services, residential-rental services, and a small set of social-policy supplies. The mandatory VAT registration threshold is THB 1.8 million of annual revenue — voluntary registration available below.

Cross-border digital services to Thai consumers by non-resident vendors are subject to VAT under the Electronic Service Provider regime in force since 1 September 2021. Non-resident digital-service providers must register, charge 7 percent VAT to Thai-consumer customers, and remit via simplified VAT return. Specific Business Tax (SBT) operates separately on certain financial and real-estate transactions at 3.0 percent (banking, insurance, finance) or 3.3 percent (real-estate sales by frequent-transactors). SBT applies in lieu of VAT for these specified categories. Excise duties apply on alcohol, tobacco, automotive (up to 50 percent on luxury vehicles), petroleum products, and specified beverages.

How is crypto taxed in Thailand?

The Thai framework for cryptocurrency taxation operates under specific provisions of the Revenue Code as amended by Emergency Decree on Digital Asset Businesses 2018 and subsequent amendments. For individual filers, gains on the disposal of cryptoassets are subject to 15 percent withholding tax at source under the Revenue Department's emerging guidance, with the gain also includible in the annual return at the standard progressive rates with credit for the withheld 15 percent [SC4]. The framework distinguishes between disposals on Thai-SEC-licensed exchanges (favourable treatment) and disposals on offshore or unlicensed platforms (full general framework).

The Revenue Department has issued progressive guidance through 2022-2024 on specific cryptoasset scenarios — mining, staking, NFTs, DeFi lending. Royal Decree 379/2561 (B.E. 2562) provides 15 percent withholding on Thai-resident-investor crypto-disposal profit. Royal Decree 312/2022 retroactively exempted regulated crypto-exchange transactions from VAT (effective 1 April 2022 through 31 December 2026) — major regulatory framework reduction. Revenue Department Notification 2022 exempts cross-border unrealized losses from offsetting. The Securities and Exchange Commission of Thailand (SEC) regulates digital-asset operations under the Emergency Decree alongside the Revenue Department's tax framework.

Mining rewards are taxable as ordinary income at fair market value on receipt under existing income-tax provisions. Receipt of crypto as employment compensation is taxable under standard payroll-tax framework (Section 50 withholding). Cross-listing on a SEC-regulated Thai digital-asset exchange provides specific treatment under the post-2022 reforms — notably exemption of certain gains realised on SEC-licensed-exchange disposals subject to qualifying conditions. The Bank of Thailand's restriction on cryptocurrency-as-payment for goods/services since March 2022 affects the operational framework but does not directly affect the tax treatment. The Thai framework continues to evolve; practitioners should check current Revenue Department guidance.

How does Thailand handle tax treaties?

Thailand maintains a network of approximately 60 comprehensive Double Taxation Conventions in force [SC4]. Most Thai treaties follow the OECD Model with Thai-specific reservations on the credit-versus-exemption method (Thailand generally applies the credit method) and on technical-services source taxation. Major treaty partners include all major economies — United States (1996), United Kingdom (1981), Germany (1967 with subsequent amendments), Japan (1990), China (1986), India (1986 with 2015 protocol), Singapore (1975 with 2015 protocol), Australia (1989), Korea (2006), all major EU economies, and significant ASEAN coverage.

Thailand signed the OECD Multilateral Instrument 9 February 2022. Has not yet ratified as of 2026 — remains pending. Once in force: PPT will apply to most Thai treaties. Thai reservations include LOB and arbitration provisions. Synthesised texts pending publication. Foreign tax-credit relief is generally claimed under Section 49 bis of the Revenue Code. Specific source-state-favourable provisions in Thai treaties — particularly on technical-services fees, royalties, and interest from Thai source — distinguish Thai treaties from the OECD-Model norm. Form Ror.Mor.18 (Residency Certificate, Bai Rabprong Rabraen Phasi Akon) issued by Revenue Department for treaty-rate application by foreign withholding agents.

The Thailand-US treaty contains a Saving Clause preserving US citizenship-based taxation; pension articles favourable for cross-border retirees. The Thailand-Singapore treaty was renegotiated in 2015 with anti-treaty-shopping amendments. The Thailand-China treaty (1986) provides reduced withholding on dividends/interest/royalties supporting major bilateral trade flows.

What are the common penalties and pitfalls for foreigners?

Late filing of Thai tax returns triggers fines under the Revenue Code: standard fine THB 200 for each missed return; monthly surcharge of 1.5 percent on unpaid tax (equivalent to ~18 percent annualised). Tax-evasion offences under Section 37 of the Revenue Code escalate to criminal jurisdiction with imprisonment for serious cases (up to 7 years). The Revenue Department's enforcement environment has become more rigorous since the post-2018 Phasi Akon reform programme.

Common pitfalls for foreigners and inbound assignees: misunderstanding the post-Por-161/2566 remittance framework — many Thai-resident expats with foreign-investment-portfolio holdings underestimated the post-Jan-2024 framework expansion; failing to file PND 90 or PND 91 by 31 March (Thailand requires filing even when employer-withholding fully covers the liability — this differs from Singapore/Malaysia frameworks where many filers don't file); treating SET-listed-share gains exemption as automatic on offshore-broker holdings (the exemption applies only to disposals through SET-member Thai brokers); failing to apply Por-161/2566 correctly to pre-2024 vs post-2024 income (the framework distinguishes by year-earned, not year-received); assuming LTR-visa flat-tax election covers all categories (the 17 percent flat applies only to Highly-Skilled Professional category on Thai-source qualifying employment income).

Foreigners working in Thailand should also note: Thailand's BOI-promoted-employment work permit framework provides specific visa-status benefits but does not automatically alter Thai tax residency analysis (180-day test still applies). Foreign assignees on rotation schedules can avoid Thai tax residency by managing physical-presence days carefully — though border-control records are now electronic and Revenue Department audit access has increased. Common approaches discussed by practitioners include consulting a credentialed Thai tax professional (CPA or Revenue-Department-registered tax-licensed accountant) with cross-border-expat experience for any structure involving Por-161/2566 application, foreign-investment-portfolio remittance, or LTR-visa positioning.