
For example, as a real opening frightener, for a retirement visa it is possible that you might actually need to send the equivalent of 1,142,857 THB to receive 800,000 THB because of 30% possibly being withheld and even worse, that might be at the offshore rate

Until it becomes clearer what the rules are for different types of transaction it would be helpful, as a start, for those members who make THB withdrawals from ATM’s in Thailand using overseas cards (GBP, USD, EUR, AUD) and who can quickly find out what rate that it is exchanged as in the overseas currency could briefly post the details in this thread.
As experience is gained with other transactions, these could also be added.