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).
the fact that HMRC has deducted tax at source is as I keep repeating irrelevant to whether Thailand taxes that income. The UK DTA may exempt that income altogether as is the case with government pension schemes or will allow a tax credit against other forms of income. Using Thai allowances and deductions and full utilisation of available tax credits a basic taxpayer would only start paying Thai tax after remitting more than £39k per year. Sums below that figure would have a net zero Thai tax bill as the UK tax credit would cover it. You would need to get a TIN and file a Thai tax return in order to claim the tax credit.