WRONG: "Leave it in there for three months and then go to immigration with all the documents" . . . . . the seasoning of the 800,000 THB in order to apply for the 1-year Extension is TWO months, not 3 months
if you already have a Thai bank with a minimum of 800,000 THB sitting in it, a proof that the money came from abroad, a rental contract and a minimum of 15 days left on your "admitted stay" stamp, you can apply for the "change of visa type" from a touristic entry to the 90-days Non-Imm-O Retirement Visa on Immigration (not in Jomtien, they go by different rules) If you DON'T have a Thai bank account, yet, you CANNOT convert (there is only ONE agent in Bangkok who would do it for you if you buy their complete package for 60,000 THB) The official requirements are listed under number 9 of this list:
Money stays in your bank." . . . . "stay" ??? . . . . only for the application to the visa. For the application to the extension the money needs to sit in your Thai bank account
Following the news about WISE transfers from abroad, I have noticed more and more people complain that the transfer doesn't show as coming from abroad any more, despite choosing the correct "reason" on the WISE website ("funds for longterm stay in Thailand" or "property purchase"). I reckon everybody should discontinue using WISE and do a direct SWIFT transfer from your home bank to your Thai bank account
NO you cannot make the "change" from a touristic entry tpo a 90-days Non-O visa any more, since February 2025, unless you already have a Thai bank account with 800,000 THB sitting in it. In Jomtien only, they will ask you for a bank letter which confirms that the money already has seasoned for two months for the application to the initial Non-O visa (which is contrary to the official police order, that only requires the money to SIT in the account on the day you apply)
there is NOTHING to thank you later, because you definitely have missed the news. . . . yours was a long time ago!! Not possible any more since February 2025
you definitely CAN change from a tourist visa to a "90-days Non-Imm-O Retirement Visa" if you ALREADY have a Thai bank account with 800,000 THB sitting in it and if "your" Immigration is willing to apply the current POLICE ORDER, as you can read under number 9 on this Immigration website. If an Immigration office tells you they can't, that's Thailand
if you got a minimum of 800,000 THB sitting in your Thai bank account (no seasoning required at this point!) , there is no problem to apply for the "change of visa type" from a touristic visa-exempt entry to an initial 90-days Non-Imm-O Retirement Visa on Immigration. Check the procedure here under number 9 of the list