@Shirley ******
No planning. Passport with Non O 90 days visa, Thai mobile number with your name, passport and your Thai address.
I had heaps of documents (even Thai marriage certificate condo ownership contract from 2008, Thai Driving licence). No pictures, nothing.
Kasikorn expositures, 2 of them, rejected me (November 2025).
One said, your name in Certificate of Residence, shows you surname first then your given name. Go back to Immigration and tell them to issue it different order. Obviously, that bank manager ordered his staff that no foreigner can open bank account with them.
The second one, said, you live in Samut Prakan Province, (3km away) we are Bangkok Province, we are not allowed to open cross provinces accounts.
Go to Bangna Central.
The 3rd one accepted my passport only. Tossed aside my Certificate of Residence, my house Yellow book, my TM30, my Thai Pink ID, laughed at me "who told you you need this crap"? Why did you bring it here?
Then, where is your Thai wife?
What if I had no wife? "Just bring her in" as if I could conjure a wife. She (wife of 25 years) came in, I do not know why they needed her.
Account opened.
As many here, Mods before all, said it may be a walk around different bank branches.
All this might not help you much, just be prepared what might happen.