Just for info. Just went immigration in Nakhon Ratchasima to collect my 11 month extension on my marriage visa after they gave me 1 month when applied.
Everyone told me to not touch the 400 in the bank until the 11 month was approved which was new as I always started spending it.
Wasn’t asked to prove the 400 was still there. Just gave me the extension.
Maybe just Nakhon Ratchasima
All good.
TLDR : Answer Summary
The user successfully obtained an 11-month extension on their marriage visa in Nakhon Ratchasima without needing to provide proof of funds in their bank account. They were advised to not touch the required 400,000 THB until the extension was approved, but were not asked to present any documentation regarding this amount during the application process. Comments from others indicate varying experiences across different immigration offices in Thailand regarding these requirements.