Do I need to have monthly deposits in addition to maintaining 800,000 THB in a Thai bank account for a retirement visa?

As others have stated it is not necessary, but if you want to change to the monthly income method in a year, you need to deposit 65,000 Baht per month for 12 months to qualify next year.

Similar question was asked today on this forum. Suggest you read it and all replies.

You'll need money here anyway of course: some use their ' visa' account for their monthly expenses, others set up a seperate account, but the latter has nothing to do with visas if you have the 800K in the other

It is not, 🙂 There is no requirement that you bring any funds in to the country every month if you are using banked money method to meet the proof of funds

These are the two ways you can meet the proof of funds for a "retirement visa" (Non-O/Extension)

- 𝗕𝗮𝗻𝗸𝗲𝗱 𝗠𝗼𝗻𝗲𝘆 𝗠𝗲𝘁𝗵𝗼𝗱

bank 800K baht in a thai bank account in your name only for the requisite time (2 months before you apply for the extension, the funds stay in the account 3 months after the extension is granted and then the balance can't go below 400K the rest of the year)

- 𝗠𝗼𝗻𝘁𝗵𝗹𝘆 𝗜𝗻𝗰𝗼𝗺𝗲 𝗠𝗲𝘁𝗵𝗼𝗱

transfer in to a thai bank account in your name only from abroad a minimum of 65K baht per month, each month, every month for the previous 12 months before you apply for your yearly extension

OR

get a letter from your embassy here in thailand stating you have that income in your country (US, UK, Australia and Canada all stopped issuing that letter)