@Sefton *******
Remittances are first of all: remittances .
If they are based on INCOME, or SAVINGS or any other reason: is a completely different thing.
Remittances aren't taxed - not at all. Neither for Thai nor for on Thai. Never were, and most likely never will be.
INCOME is taxed. And if it is taxed or not, and how it is taxed, depends on many questions.
Simple answer: if you make INCOME now, AND remit the INCOME to Thailand: THEN it is taxed.
If you have a big SAVINGS account with money, you made years ago, you can remit what ever you want form that account: because it is NOT INCOME! Simple concept.
And to make it even more blunt: Thailand considers PENSIONS not as taxable INCOME.
The likelihood that a foreigner has to pay taxes for money he transfers from outside into Thailand: is basically zero.
On the other hand, if you have a flat/house to rent out, somewhere outside Thailand, you technically generate taxable INCOME. So the stupid question is only: do you want to pay the tax in your home country? Or transfer it INSTANTY to Thailand, so your home country has no plausible reason to tax you? If you transfer it to Thailand, you are taxable in Thailand - if you are here more than 180 days, per year.
And guess why this discussion is so tiring? The tax free allowance in Thailand is so freaking high (and the tax rate is so freaking low), that everyone who lives here should make simply sure, he cuts the tax line to his home country.
And for people like you: learn the difference between taxable INCOME and "random money transfers" - it helps a lot, and eases the mind.