Of course, there are many tricks to get around the tax system. I have my tricks too. But you can't avoid filing a tax return, even if you're not liable for tax. You are also obliged to submit one if you have a one year retirement visa.
I heard from an Australian friend that pensions from Australia are not subject to tax in Thailand. Unfortunately, this does not apply to all countries. Apparently, other countries have different rules. My country does not levy any taxes on my pension, which means that it is fully taxable in Thailand if it is paid into a Thai account.
I got the information that all foreigners who live in Thailand for more than 180 days a year must have a TIN number and must file a tax return for the year 2024, no matter if they have a taxable income or not. Deadline for the tax return is March 2025.
I recommend you get the newest information from your embassy in Bangkok. My embassy informed me quite well, but recommended to wait until the end of the year, as Thai authorities could change things from day to day.