they have enforcement teams but the resources are limited so they go after the many big fish in Thailand. Your personal income tax enforcement is not high on their radar unless of course you come to their attention through criminal activity.
You must realise that the people you are speaking with at the Revenue are low paid unqualified data entry clerks and not professionally qualified tax advisers. They can enter some data into a computer but that’s about it. Not people to take tax advice from.
clearly you have no idea what you are talking about. What do you mean by “most of the income”? That is imprecise, either the income is subject to tax or it is not. What do you mean by “supposed” to be taxed? There is no “supposed” to be taxed under the Revenue Code. It’s either assessable or it is not....
not all income remitted whilst tax resident is taxed by Thailand. The income must first be “assessable” under section 40 of the Thai Revenue Code. Multiple exemptions apply to income under DTA arrangements.