What documentation do I need from my Thai bank for my retirement extension with an $800k THB deposit?

I did not know you had to prove the funds came from outside Thailand

I thought as long as you have 800k

It should be ok

The only document you need from your bank is a letter from the bank. My bank charges 100 THB and letter is valid for three business days. Then you need copy of your bank book First page and all pages going back one year. Immigration while require passport copy along with copy of entry stamp. Also proof of residency. Photo

Bank statement for 3 month

Bangkok Bank soi 43 Sukhumvit has staff who speak English and will facilitate opening an account, or statement for yearly visa requirements

Bank book updated and a 1 year statement printed out from bank

Everyone keeps telling you to update your bank book and they are correct. What nobody mentioned is that you need some type of activity in your account the day you update it/go to immigration. Do a 100 Baht ATM withdrawal for example and then update your bank book.

One can easily see by reading the post and the comments why agents are thriving in Thailand for long term extensions

By the sounds of things you're not going to be applying for any extension but an in country Non-O visa for the purposes of retirement there are no seasoning requirements for the money. You should be able to apply when you have 30 days left on your current stamp. Make sure you apply while you still have at least 15 days left on your current stamp. Since you've already got the bank documents I'd apply sooner than later as they have to be no more than 7 days old. When your 90 day visa is running down you'll need to repeat the process to get an extension but will need at least 2 months worth of bank statements

I needed statement , updated bank book , and guarantee letter from bank confirming the funds .

I needed to present the documents to immigration with the rest of my application within 24 hours.

Hope that helps, but it wasn't in Bangkok and each office can differ.

Good luck. 🙏

Must update your bank book prior to going to immigration on the same day you apply for your extension.

And copy of updated bank book

You need a letter from the bank that today is 0 and you keep same amount. For the 2 months

Update your bankbook before you go