What do I need to obtain 12 months of bank statements and a balance certification at Bangkok Bank for visa renewal?

To obtain 12 months of bank statements and a certification of balance letter from Bangkok Bank, you will need to bring both your passport and your bank book (or passbook) when visiting the branch. It is generally advisable to bring ample paperwork when handling banking tasks in Thailand. Regarding the timing for visa renewal, bank statements should be no older than 7 days before submission, and the certification must be obtained on the same day as the renewal application. While some branches may accept statements printed from the app, others adhere strictly to recent documentation.