How long before my retirement visa extension should I top up a different bank account to 800,000 baht?

My imo required 3 months with letter from bank (Sakon Nakhon)

Kap choeng Surin div 4 where not happy i changed from Bangkok to Kasikorn.even tho cash out of B/b to K/bank done same day..i was told "now not 2 months"..box of Uk chocolate seemed to ease the frustration..hopefully 28th Jan get my 1yr extension🤞

2 months

I just went through this In Chiangmai. They told me I could use 2 different bank accounts as long as the total was the correct amount. I used K bank and BKK. Lettters from both. Passed with flying colors.

I thought I was ok with numbers....but this got me ......"huh?"...

Why wait, can’t you just do it now ?

Wait for 3 months after your extension then after the 3 months you can drop down to 400k. Make sure to have 810k and then move 405k so both accounts are not under 400k then the next day you are free to move the other 405k over. 3 months after your extension and 2 months before your next extension you have to have 800k minimum the 7 months between you can drop to 400k. I would check with your immigration office first though. They might not like the extra work. My office in Phichit did not encourage it

As a general rule, you must have had 800K baht in your Thai bank account for two calendar months as of application day. Be careful when you move money between banks. You should keep more than 400K baht in one of two accounts anytime during the switching process, as you must keep 400k baht throughout the year, after three months of keeping 800k baht in your bank account from the last extension approval.

You will need bank letters and transaction records from both banks for the next application.

There are a few offices that require you to have 800k baht in your Thai bank account for three months when you apply for a new extension. Most offices accept an extension application when your current stamp is remaining 30 days or less. So, go to your local immigration office to get the latest requirements 3-4 months before you apply for the next yearly extension based on retirement, for you not to be too late to put money up to 800k baht for the next application.