180 days inside the Kingdom in a calendar year makes you automatically a Thai tax resident. If you remit assessable income you are legally required to obtain a TIN, bringing assessable income into Thailand above minimum thresholds requires you to file a Thai tax return. You can bring up to £
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, as a basic rate taxpayer, before attracting a Thai tax payment provided you make use of the DTA tax credits by filing your tax return.
UK private, UK company and UK state pensions are all taxable when remitted to Thailand. Only UK government pensions are exempt via the DTA (military, police, fire, NHS, etc).