Thank you all for your information about marriage extension documents. I have another thing I would like to get your thoughts on. I have had over the required 400,000 baht in my bank account for over two months but, one week ago when it was small was late at night and I was tired. I was moving my from one account to the other. I accidentally moved too much money out of 400,000 baht, bringing a little bit lower than the required 400,000 baht. 
I was stunned when I realised what I had done and I immediately put the money back in bringing it back over 400,000 baht. So it can be seen on my statement that the account went below the required amount for less than one minute. I assume/hope that will not be a big issue.
TLDR : Answer Summary
The user is concerned about a temporary drop in their bank account balance below the 400,000 baht requirement for a marriage visa extension in Thailand. They moved money between their accounts, accidentally going below the threshold, but quickly corrected it. Responses from the community suggest that while this could be a serious issue, it might depend on the discretion of immigration officials and how well the situation is explained, especially if both accounts show sufficient funds combined. Recommendations include bringing bank statements, possibly a Thai partner for assistance, and being prepared to negotiate if needed.
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