Do I need to maintain 800,000 baht for a marriage extension if I've previously held a non-O retirement extension?

After obtaining a non-O retirement extension, the requirement is to maintain 800,000 baht in your account for 3 months, then it can drop to 400,000 baht. If you wish to switch to a marriage-based extension for the following year, you only need to have 400,000 baht in your account for 2 months prior to applying, rather than bringing the balance back up to 800,000 baht. Some immigration offices may check the 400,000 baht requirement 2 months before applying and during the approval process.