Hi Sherita, thanks. Do you have a copy of Singapore tax law in order to compare with Thailand tax law? The law in Thailand seems very clear in that it specifically says tax is raised "at every level", and they go on to give clear examples.
Both Singapore and Hong Kong (HK has no VAT or GST at all) are well known for their liberal, business friendly, approach to taxes. Thailand is known for its rather more draconian approach.
Would love to adopt same practice as Singapore but we are entirely bound by the laws of Thailand. If we were to adopt the same practice as Vietnam (who I understand bill through Singapore) for example, and bill our Thailand invoices through Hong Kong, we would be guilty of tax evasion in Thailand, something we cannot do.
Let me have our Group Financial Controller, Khun Sukunya Khunsook, take another look at any other potential solutions, I will update you again when done.