Do I need to show 500,000 baht again when extending my DTV Workation visa in Thailand?

You are required to have the 500k for at least 3 months in your bank account and yes, when you extend you will have to show the 500 k again.

When you extend in country you 100 percent sure have to proof you still have the 500k.

When you just borderbounce there only is a small chance you have to proof you still comply.

The financial amount should be no less than 3 months seasoned in your bank/savings account unless Belgium Embassy clearly states 1 month. I have never seen any Embassy allowing just 1 month evidence of finances. In addition, if you extend at Immigration you will need to provide all documents again as if applying for the first time. It is best to do a border run to any of the neighboring countries. I recommend just planning local mini vacation trips to places like Laos, Vietnam, Singapore, Cambodia, etc. Good luck.

Be sure you apply in Laos or Vietnam, they are very helpful

If you extend in-country, the requirement is to show the 500K again. This is one of the reasons why many people choose to do border runs.