What the treaty does
The convention covers specified UK and Thai taxes on income and gains. It contains residence tie-breakers, source rules, limits on some investment-income taxation and methods intended to relieve double taxation.
The treaty has also been modified by the Multilateral Instrument. Use the current synthesised text and do not rely on an isolated extract of the original 1981 wording.
Classify income before applying a rule
| Income or activity | Main treaty area | Question to investigate |
|---|---|---|
| Trading profits | Business profits and permanent establishment | Does the enterprise carry on business through a taxable presence in the other country? |
| Employee salary | Dependent personal services | Where are the duties physically exercised, and does the short-stay exception apply? |
| Directors’ fees | Directors’ fees | Is the payment made in the capacity of director of a company resident in the other state? |
| Dividends | Dividends | Which company paid, who beneficially owns the income and what domestic withholding applies? |
| Interest or royalties | Investment-income articles | Where does the payment arise and are treaty limits available? |
| Pensions | Pensions and government service | Is it a private pension, State Pension or government-service pension? |
| Asset disposal | Capital gains | What asset was sold, where is it situated and do temporary non-residence rules apply? |
Employment and directors’ fees are different
Salary is generally analysed by where employment duties are exercised, subject to detailed exceptions. The familiar 183-day employment exception also contains employer and permanent-establishment conditions, so day count alone is insufficient.
Directors’ fees have a separate article that may allow taxation in the state where the company is resident. A director who performs wider executive duties may need payments apportioned and categorised carefully.
Relief from double taxation
Depending on the income and treaty mechanism, relief may be given as an exemption, a credit or a restriction of tax at source. The credit normally cannot exceed the domestic tax attributable to the same income.
A person may still file in both countries. Retain residence certificates, final assessments, payment receipts, withholding certificates and calculations linking the same income across the two returns.
Dual residence and disputes
If both domestic systems treat an individual as resident, apply the treaty residence provisions in sequence to the facts. Permanent home, centre of vital interests, habitual abode and nationality may be relevant.
For a company, dual-residence and treaty-entitlement questions are more complex and may involve competent-authority procedures. Do not assume that an individual tie-breaker can be copied to a company.
Evidence for a treaty claim
- Current residence certificate where required
- Complete UK and Thai returns
- Proof of final foreign tax paid
- Contracts and duty-location records
- Dividend vouchers and ownership records
- Exchange-rate methodology
- Written computation identifying the treaty article
Frequently asked questions
Can I choose to pay tax only in Thailand?
No. The treaty allocates taxing rights according to residence, source and income type.
It may provide relief where both countries tax, but it is not a general right to choose the lower-tax country.
Does spending fewer than 183 days prevent tax on salary?
Not by itself. The employment article’s short-stay exception also considers the employer and whether remuneration is borne by a permanent establishment or fixed base in the other country.
Are salary and directors’ fees treated the same?
No. The convention contains a specific directors’ fees article.
Executive employment duties and payments made in the capacity of director may require separate analysis.