Mike, I thank you again and others and again this has been covered many times before by Mike and indeed there was tax lawyers explanation on this site and unless you are filthy rich, the vast majority will be under the Thai tax thresholds and there are quite generous allowances available.
As for a Tax return and if not exceeding the allowance then why do you need to fill in a tax form.
Also, in many posts it seems it will be extremely unlucky to be pulled up on this but sometimes in the Western world one can get fined.
I have seen some posts and stating it might be linked to your yearly extensions but have been led to believe this is a different department but in due course who knows in Thailand and some things change quickly in Thailand.
Why this ascome up again, I do not know but there are extensive posts on this forum and you just have to look up the subject matter.
Cheers all