Thailand has long been one of Asia's most popular destinations for British and international expatriates, drawn by the climate, relatively low cost of living, high quality of private healthcare, and a well-developed expat infrastructure. For financially sophisticated individuals, Thailand offers a reasonably straightforward tax environment, although significant changes introduced from 2024 onwards mean that historic planning strategies — particularly around the remittance of foreign income — require careful review. This guide sets out the key financial planning considerations for HNW internationally mobile individuals considering Thailand as a residence.
This guide is for general information only. Tax rules change frequently and individual circumstances vary considerably. You should seek independent professional advice before making any decisions based on this content. The value of investments can fall as well as rise.
Tax Residency in Thailand
Under Thai law, an individual becomes a tax resident if they spend 180 days or more in Thailand in any given calendar year. There is no formal statutory residence test comparable to the UK's SRT, nor is there a concept of deemed domicile. The residency determination is essentially a simple day-count test.
Unlike some jurisdictions, Thailand has historically not required tax residents to report or pay tax on foreign-sourced income unless that income was remitted into Thailand in the same tax year it was earned. This was a significant attraction for wealthy expatriates, who could park offshore income and only bring in what was needed for living expenses.
From 1 January 2024, the Revenue Department issued revised guidance effectively closing this remittance-basis planning: foreign-sourced income remitted to Thailand is now subject to Thai personal income tax regardless of which year it was earned. This is a material change that catches many existing expatriate structures and requires urgent review for those already resident in Thailand or planning to become so.
Income Tax
Thai personal income tax (PIT) applies to assessable income from Thai sources and — for tax residents — remitted foreign income. The progressive rate schedule (as of 2026) is as follows:
| Taxable Income (THB) | Rate |
|---|---|
| 0 – 150,000 | 0% (exempt) |
| 150,001 – 300,000 | 5% |
| 300,001 – 500,000 | 10% |
| 500,001 – 750,000 | 15% |
| 750,001 – 1,000,000 | 20% |
| 1,000,001 – 2,000,000 | 25% |
| 2,000,001 – 5,000,000 | 30% |
| Above 5,000,000 | 35% |
The top rate of 35% is materially lower than the UK's combined income tax and National Insurance burden for higher earners. Various personal allowances and deductions apply, including a personal allowance of THB 60,000, spouse allowance, and deductions for life insurance premiums, provident fund contributions, and donations.
Employment income sourced in Thailand is subject to withholding. Self-employed individuals and business owners must file annually by 31 March.
Capital Gains Tax
Thailand does not levy a separate capital gains tax on most types of investment. Gains on the sale of securities listed on the Stock Exchange of Thailand (SET) are generally exempt from personal income tax for individuals (subject to certain conditions).
Gains on the sale of real property are subject to a withholding tax at source based on a formula incorporating the appraised value, period of ownership, and personal deductions. The effective rate depends heavily on how long the property has been held and the assessed value — in practice many sellers find their effective rate is low, particularly for properties held over five years.
For foreign assets, gains remitted to Thailand from 2024 onwards are assessable income under the new guidance and should be disclosed on annual returns.
Inheritance and Estate Tax
Thailand introduced an Inheritance Tax Act in 2016. The tax applies to inherited assets received above THB 100 million (approximately £2.2 million at current rates). The rate is 5% for direct descendants and ascendants (children and parents) and 10% for all other beneficiaries, including siblings and unrelated individuals.
Importantly, only Thai-located assets are within scope for Thai inheritance tax. Offshore assets held by a Thai tax resident are not subject to Thai IHT — though they may be subject to UK IHT if the individual remains a "long-term UK resident" under the residence-based IHT regime in force from 6 April 2025 (broadly, UK tax resident for at least 10 of the previous 20 tax years).
There is no gift tax per se, though structuring assets to avoid inheritance tax could be challenged by the Revenue Department on substance grounds.
Wealth Tax
Thailand does not levy a recurring annual wealth tax.
A land and buildings tax applies to property ownership (not wealth broadly): primary residences above THB 50 million face a 0.02% annual charge on the excess; investment/commercial properties face higher rates. The land and buildings tax replaced the old house and land tax from 2020.
Pension Considerations
Thailand has no social security system equivalent to the UK's State Pension scheme for non-employed residents. There is a social security fund (SSF) for employees in the formal Thai employment sector, covering Thai nationals and legally employed foreigners, but contributions are capped and benefits modest by Western standards.
For British expatriates:
UK State Pension: Continued entitlement is based on National Insurance contribution record, not place of residence. However, state pension is not uprated in Thailand: the Thai government has not concluded an agreement with the UK to index-link state pension payments. British pensioners in Thailand receive their pension frozen at the rate applicable when they first drew it (or when they moved to Thailand if already drawing). This is a significant long-term financial consideration — the real value of state pension income erodes over time.
UK defined benefit pensions: Payment is unaffected by Thai residence, but subject to UK income tax (deducted at source or under self-assessment) and potentially Thai income tax if remitted to Thailand. The UK–Thailand Double Tax Agreement (DTA, 1981) provides relief: government pensions are generally taxable only in the UK; private pensions may be taxable in both countries with credit relief available.
SIPPs and drawdown: UK personal pensions can generally be drawn while resident in Thailand. There is no Thai equivalent of QROPS that is particularly well-regarded for British expats — most advisers recommend retaining UK pension vehicles and managing remittances carefully.
Local retirement savings: Thailand's Retirement Mutual Fund (RMF) and Super Savings Fund (SSF) offer tax-deductible contributions for Thai-sourced income earners, but are generally not available or suitable for most British expatriates without Thai-source employment income.
Banking and Financial Services
Thailand has a well-developed banking system anchored by large domestic banks — Bangkok Bank, Kasikorn Bank (KBank), Siam Commercial Bank, and Krungthai Bank — alongside international banks including HSBC (limited retail branch presence), Citibank (now Krungsri), and UOB.
Opening a Thai bank account as a non-resident or new resident is straightforward in principle but bureaucratic in practice: a Non-Immigrant visa (not a tourist visa) is typically required, along with proof of address, passport, and sometimes a letter from an employer or property lease. Some banks require a larger minimum deposit for foreigners.
The Thai baht (THB) is a managed floating currency. Historically it has been relatively stable but can be affected by regional capital flows and political events. For HNW individuals holding significant assets in THB, currency risk over the medium term is real.
Exchange controls: Thailand maintains some capital controls. Bringing money into Thailand is generally unrestricted; remitting large sums out of Thailand (particularly from property sales or investment proceeds) requires compliance with Bank of Thailand regulations and supporting documentation. Foreign currency accounts can be held but must be supported by legitimate foreign income or imports.
Investment Climate and Regulations
Thailand's investment environment is open to foreign portfolio investment in listed securities with few restrictions. The SET is a mature exchange. However, there are significant restrictions on foreign ownership of unlisted Thai companies — the Foreign Business Act limits foreign ownership in most sectors to 49%, with some exceptions through Board of Investment (BOI) promotions.
Property ownership: This is one of the most significant constraints for expatriates. Foreigners generally cannot own freehold land in Thailand. Common structures used include:
- Condominium units: Foreigners may own freehold condominium units provided foreign ownership in the building does not exceed 49% of total floor area.
- Long leasehold: 30-year leases (renewable, though enforceability of renewal clauses is uncertain in Thai courts).
- Thai company structures: Some investors have used Thai-registered companies to hold land, but the Revenue Department and Land Department scrutinise nominee share arrangements, which are illegal.
The Thailand Elite Visa (now the Thailand Privilege Card) offers long-stay permits for a fee, popular with retirees and remote workers.
Cost of Living
Thailand's cost of living is generally low to moderate by Western European standards. Bangkok and major resorts (Phuket, Koh Samui) are more expensive than provincial areas but remain significantly cheaper than London or most major Western cities. A comfortable upper-middle-class lifestyle — including private healthcare, international schooling for children, and regular travel — is achievable at considerably lower cost than equivalent standards in the UK.
Private healthcare in Bangkok is excellent quality and very affordable by Western standards, which is a key consideration for retirement planning.
Social Security Contributions
There is no mandatory social security contribution requirement for foreigners who are not employed in Thailand. Employed foreigners contribute to the Social Security Fund at a rate of 5% of monthly salary (capped at THB 750/month), which provides limited healthcare and maternity/injury benefits.
Self-employed individuals and retirees living in Thailand on retirement visas or Thailand Privilege Cards have no social security obligations.
Key Compliance Issues for Expatriates
Annual tax filing: Tax residents (180+ days) who have assessable income must file a personal income tax return (PND.90 or PND.91) by 31 March each year. Failure to file attracts penalties. Many expatriates with only foreign-source income previously did not file; the 2024 rule change means this approach is no longer safe if foreign income is remitted.
The 2024 remittance rule change: As noted above, this is the single most significant compliance risk for British and international expatriates in Thailand. Pre-2024 structures that relied on spreading remittances across years need to be reviewed with a Thai tax adviser.
UK tax obligations: Leaving the UK does not automatically end UK tax obligations. Under the Statutory Residence Test, splitting time between Thailand and the UK requires careful management to avoid being treated as UK resident. UK-source income (rent, dividends, pension) may remain subject to UK tax under domestic law, with the UK–Thailand DTA providing relief in some cases.
HMRC reporting: UK residents moving to Thailand should file a P85 departure form and notify HMRC of non-resident status. Rental income from UK property remains subject to UK income tax through the Non-Resident Landlord Scheme. UK-situated assets always remain within the UK IHT net, and worldwide assets stay in scope while the individual is a "long-term UK resident" (broadly, UK resident for 10 of the last 20 tax years) under the residence-based IHT regime that replaced domicile from 6 April 2025.
CRS/FATCA reporting: Thailand has implemented the Common Reporting Standard (CRS). Thai financial institutions report UK-resident account holders' information to the Thai Revenue Department and, through the automatic exchange of information, to HMRC. Offshore accounts held elsewhere are reported to HMRC through their respective jurisdictions.
Practical Financial Planning Tips
Review the 2024 remittance rule urgently if you are already in Thailand or plan to move shortly — particularly if you have accumulated pre-2024 foreign income that has not yet been remitted.
Structure pension drawdown carefully: Consider the interaction between UK pension income (subject to UK withholding under PAYE) and Thai assessability if remitted. Advice from advisers qualified in both jurisdictions is essential.
Maintain currency diversification: Keep core wealth in GBP, USD, or EUR outside Thailand. Do not overconcentrate in THB assets.
Property caution: The 49% condominium rule and leasehold uncertainties mean Thai property is not straightforward for long-term wealth preservation. Legal advice specific to Thai property law is non-negotiable.
State pension freeze: Factor the absence of uprating into long-term retirement income projections. The gap between a frozen 2026 pension and an index-linked equivalent could be substantial by the 2040s.
Healthcare provisions: Private health insurance covering treatment in Thailand and medical evacuation is essential. Include projected premiums in retirement cash flow models.
Succession planning: Thai inheritance law applies to assets located in Thailand regardless of the deceased's nationality. A Thai will (separate from a UK will) is advisable for Thailand-sited assets. Ensure powers of attorney covering Thai assets are properly apostilled.
How Global Investments Can Help
Thailand is one of our most active markets for internationally mobile clients. We have experience advising British nationals at all stages of the Thailand journey — from pre-departure UK tax planning and pension review, through structuring offshore investments to minimise Thai assessability, to succession planning for clients with mixed UK and Thai assets.
Our advisers understand both the UK tax framework (statutory residence test, HMRC reporting obligations, IHT exposure) and the Thai tax environment, including the implications of the 2024 remittance rule change. We work with specialist local Thai tax counsel where domestic filings and property structures are involved.
Whether you are considering the move, already living in Thailand and seeking a structured review, or managing the financial affairs of a Thai-resident family member from the UK, Global Investments can provide the international perspective your situation requires.
Contact us to arrange a complimentary initial consultation.
This guide is for general information only and does not constitute financial advice or a personal recommendation. The value of investments can fall as well as rise and you may get back less than you invest. Tax rules, pension legislation, and investment regulations change — always verify current rules and seek advice from a qualified independent financial adviser before making any financial decisions.