What documentation do I need to prove the transfer of 800k baht for my O retirement visa application in Thailand?

To support your application for an O retirement visa in Thailand, you will need to provide proof that you have transferred 800,000 baht from abroad to a Thai bank. The necessary documents include an updated bank book and a letter from your bank confirming the balance. Additionally, to verify the origin of the funds, you should also obtain a "credit advice" document from your bank, which shows that the money came from abroad. This proof is only required for the initial Non-O visa application, not for subsequent extensions. It's also advised to deposit a small amount (e.g., 100 baht) on the same day you update your bank book to ensure it displays the correct date.