Cannot comment on how helpful Roi Et will be.
Seems you have the dates worked out.
If you hadn't applied for non O marriage I would have suggested a non O retirement.
No under consideration period and no ongoing home visits.
Yes it's vague.
Here is cut/paste from ubonjoe post.
In other threads I have read as little as 5 months.
"Immigration will normally waive the requirement for proof it came from abroad if the 800k baht has been in the bank for a long time already.
They put the transfer from abroad for a non-o visa application since there is no 2 months requirement. That was done to prevent people from borrowing the money or getting it from a friend."
Thinking "TM30, House book , and landlord ID" + receipt for one month rent should be sufficient given First application for extension.
Re home visit immigration will/should ring day prior to home visit.
A METV can only be obtained in home country or country where you have permanent Resident status.
Some threads discuss/ask ways to apply for METV (eVisa) while not in your country. Not good idea..
It is possible.
Banks should accept a certificate of residence however this is not possible at CW as that office requires you to have made a 90 day report to obtain COR.
One solution is to obtain a non O outside of Thailand and some banks will open a bank account based on non O.
Also some folk use an agent to open a bank account. Approx 5k.
However in recent times notice some agents not doing this in Bangkok.
Previously Siam legal provided this service and currently not.
You are over thinking it. For annual extensions (retirement) using money in the bank method.
Agents can do both assist you with you satisfying the financial requirements and also bypassing the financial requirements.
The former we refer to as "hand holding"
Of course you can do it yourself.
May seem daunting however it's not really difficult
You guess incorrectly.
For the 12 month extension the 800k needs to be in the bank account for two months prior to application for extension.
The non O eVisa you obtain in the states will mean on entry to Thailand you will be stamped in for 90 days.
As for transferring funds from home country to Thai bank account... WISE is a popular option..
When applying for non O retirement in Thailand you need to show funds came from abroad.
For annual extensions that is not required using funds in bank method
Of course. The financial requirements are checked retrospectively.
As I posted earlier...one option is to border bounce without a reentry permit and start over obtaining a new non O from visa exempt entry.
That is incorrect.
Obtained passport renewal couple of months back.
Was not dependant on living in Thailand.
The whole process was done via mail to my embassy in Bangkok.
Very simple process.
The OP did not receive ONE reply for 3 hours and I bumped his post.
Concentrate on directly assisting threads.
Rather than post link ...answer the OP. His question
"Do I need CoR when requesting tax TIN number?"
That is a nonsense.
I recently renewed my pp.
OP stated nothing about agent.
Proof of address in Thailand is not required.