I have married to Thai visa, my monthly income 40,000 (married to Thai) comes from Uk directly into my Thai bank, and they supply me with confirmation each month with a print out. Just a note, this system is long and complicated, much paperwork, and you have to supply 2 copies of everything.

I found it easier by getting my retirement visa in UK before I arrived here, but that was 22 years ago when the Thai Immigration was in London.

Closure dates were published on this site a few days ago

I get a monthly payment receipt from my bank and produce them with a yearly summary when I apply, plus statement from my bank not more than 2 days before application

I do not use the lump sum approach, I submit for marriage to Thai visa extension the proof of 40,000 monthly option. The 100,00 amount is what I also have to show in my bank book, nothing to do with visa requirements, just one of the extra items that my office require which is not quoted on the requirements needs. Much like every office has its own quirky rules. When they get a new OIC, he/she brings in their own supplementary rules. You just have to find out these and apply them, no good arguing that they are not on the requirements list

Every Office is different, for example in Hua HIn where I do my extension, I have to produce my bank book with 100,000 B in it, and the witness has to attend.

Every office want something different, the only way is go and ask what they want before you start putting the application together, make sure they stamp and sign the list. Make sure you take that list with you, why you go to extend.

Remember that an application for extension by marriage to Thai has to be approved by Bangkok, therefore it needs to be forwarded to them at least 4 weeks prior to renewal date, meaning the application date must be a month in advance

Every office has its own requirements, in addition to the laid down requirements for instance I have to have a Thai witness to my application, and I have to submit his/her details and copy his house book. Additionally I have to produce a bank book with 100,000 baht in it, which I am informed is increasing to 200,000B this year. So my advice pay them a visit and ask for all details prior to application

Agree, I am in the process of doing my 20th extension, originally Retired now married to Thai. Every year like it or not