Is it necessary to have a Thai bank account for a retirement visa in Thailand, or can I keep my funds offshore?

Greedy ones should never move to Thailand, they wont fit with local culture.😂

You need a bank account but you can keep what you already have off shore and only deposit the required amount of 800,000 baht or proof that you receive at least 65k per month.

Yes you need a Thai bank account and need to show 800,000 bht each year or bht per month for proof of supporting yourself or 400,000 bht per year if you are married. The retirement funds need to be in a Thai bank at least 3 months before you renew your yearly visa. I strongly suggest that you use a agency as you only need to get one thing wrong on the documentation and it will be rejected. I've just completed mine with Onestop Service at the bottom of Soi 6. The guys name is Mark and this service is excellent. Please don't listen to some people who think they know what their talking about, because everybody isn't an expert. I completed my retirement visa, bike and car licence all at the same time. It will cost you but it will save you the heartache of it all going down the pan.

Simple answer is Thai bank but you need to check specific requirements for your nationality and the embassy which you are applying to

A (security) deposit needs to be in a Thai bank account in Thailand for a retirement visa, unless you can show proof you have regular income (can be a pension or government retirement payout) of a similar amount.

Your biggest problem at the moment is opening a bank account it is impossible as the banks have tighten up on scam gang bank accounts,was in an agents office 1 week ago she said banks are not allowing new accounts to be opened.

You mentioned retirement so you’ll need a retirement visa and for a retirement visa you need a Thai bank account with 800,000฿.

Depends on what you call a retirement visa. The Non-OA which you can only get from your home country allows you to keep all your funds offshore. The Non-O requires funds in Thailand unless your embassy still issues an income certificate which most don't

You will get a Thailand bank account as part of the application process. (Assume you are getting a retirement visa)

Yes

Do you pay tax in Thailand and in England on the same money ?

Yes. Keep your home country bank accounts, retirement benefits and the like. Use WISE to transfer funds from your home country account to your Thailand bank account. Easy as that.

That depends on a lot of factors. What embassy you use, what visa you will get, which immigration office you'll be using. You didn't give us any information. For most people they'll have to keep 800,000 baht in a Thai bank account for as long as they want to remain in Thailand.