How do I prove the required balance of 400,000 THB for my retirement visa extension in Thailand?

When applying for a 12-month extension on your retirement visa in Thailand, you'll need to show proof of maintaining a minimum bank balance of 400,000 THB for the required period. The current practice for verifying this balance involves showing your bank statement or bank book during your extension application. Some users report that Thai immigration checks the balance during the 90-day reporting or when you submit your application. Since the new rule enforcing this requirement started on March 1, 2019, there is still some uncertainty regarding enforcement and the consequences of dipping below the required amount. It's advisable to check directly with immigration on your application day for specific documentation requirements and procedures.