Thai Revenue Code sections 40, 41 and 56 apply. In all cases it refers only to “assessable” income and section 56 gives the minimum filing thresholds below which there is no filing requirements.
what is and what is not assessable income is determined by the applicable Thai tax law. In this case section 40 of the Revenue Code. Savings are not listed as assessable income therefore when remitted do not attract a tax liability.
nope I am actually following Thai tax law to the letter. Only assessable income as defined under section 40 of the Revenue Code is reportable. Many live long term in Thailand completely legally without ever having an interaction with the taxman.
interest on the 800k is income and will be subject to withholding tax. Taxation on the original transfer is dependent on circumstances, it may or may not be taxable.