UPDATE 08/04/2025 Bank Account opening
Went to the immigration office in Nong Bua Lamphu with landlord and wife. Immigration officer spoke excellent English and processed my TM30 and issued me with an official letter for the Bank of Bangkok advising on my residential status and intentions for the bank account. Process took 30 minutes and cost 500 baht for the certificate.
I now have a 90 day NON O Visa which I applied for in the UK at a cost of £60.00 and my letter from immigration costing 500 Baht. These along with my Thai telephone number and passport should be sufficient to open the bank account.
I was then advised to return to his office after I had deposited 800k baht and allowed it to sit there for 60 days. Once that had happened I could then apply for a 1 year extension to my 90 day Non O Visa. He also said that the process is much quicker if I went to the Embassy ( I think he may have meant immigration office) in Bangkok as they can make an immediate decision.
Hope this helps
TLDR : Answer Summary
A user shared their experience of opening a bank account in Thailand after obtaining a 90-day NON-O visa. They visited the immigration office in Nong Bua Lamphu, where they were assisted in English and received a TM30 processing certificate for 500 baht. They were informed that to open a bank account, they would need the TM30 certificate, a Thai phone number, their passport, and a deposit of 800k baht to apply for a one-year extension on their visa after two months. Other community members provided additional insights into the immigration process and the importance of local immigration offices.
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