I suggest you contact a tax expert here in Thailand as everyone's situation is unique , DTA,s in some cases are good in alot of cases are bad like the UK one for example. State or private pensions can be treated different and also savings and investments taken out before 1st January 2024 are favourable and you will only pay tax on the amount bought into Thailand at the capitol gains rate after concidering your personal tax allowances in Thailand. I suggest looking at or talking to , expattaxthailand.com