If you pay tax on your income in Australia, you will get a credit ( under the DTA) against tax due for remittances you make to Thailand to live on - earnings/savings prior to 2024 will also not be taxed here , ie if you remit funds for your retirement visa or to buy a property.
dealt with tax issues continuously, I was quiet pleased to be able to retire in a country where tax residency was not an issue, that bubble soon burst…..but I think with DTA’s in place it will be a wash, already got my tax Reg number and spent some time with local tax office - keeps the mind active…..
I have looked at DTA between UK and Thailand that was signed in 1981 - it is extremely vague, does not talk about pension income, or variance between respective countries tax allowances. 40 years ago pensioner mobility was virtually unheard of, so unless there are plans to update the many treaties Thailand has in place, chaos looms next year.