Are you being asked by Portuguese Tax Authorities to prove you're a resident of Thailand for tax purposes? Or is it some other Portuguese Authority that wants to know your status? If it's for Portuguese Tax Authorities, then based on comments by
all you could do until now, is tell those authorities that you are residing longer term in Thailand, with proof (DTV & maybe rental contract, plus maybe a residence certificate from your local Thai Immigration Office) and advise the Portuguese that you can't provide any certificate from the Thailand Revenue Department until 2026,after you've lodged a Thai tax return. I'm guessing that you'd prefer to be taxed in Thailand rather than Portugal.
do you already have a Thai bank account? Then yes, you can transfer the funds in 200,000 baht lots if your UK bank limits how much you can transfer at one time. I have no idea if your UK bank has a limit on how often you can make those transfers though. I guess every country and bank makes it's own limits.
As I pointed out in my previous reply to you, if you don't already have a Thai bank account, it would be best if you got your retirement visa from the Thai Embassy in the UK, which will make it much easier to open a bank account when you arrive in Thailand and then you can hopefully get 4x 200,000 Baht transfers done two months before you would apply for your first 1 year Extension of Stay.
are you still in the UK, as your profile shows, or are you already in Thailand with the intention of applying for a 'Retirement' Visa from within the country?
If you are still in the UK and don't yet have a Thai bank account, you would be better to apply for the visa through an Embassy or Consulate there, as you can use your funds in your UK bank account as 'proof of funds', for the initial visa, then enter Thailand on that visa. It just makes it easier to open a Thai bank account if you already have the long term visa.
If you are already in Thailand and have a Thai bank account, then the answer to your question is yes, you can transfer 200k Baht at a time, as long as you have the minimum of 800k Baht in your Thai bank account a full two months before you apply for the first one year Extension of Stay.
my understanding is that you can spend the 65k monthly deposit as soon as it's in your Thai bank account, you can use any or all of it, whereas the 800k proof of funds, as you would be aware, has to be in your account for two months before applying for an Extension and 3 months after, the rest of the year, not falling below 400k.
I'm not going to claim to be an expert or close to it. I can only say what I've learnt on reading countless comments on hundreds of posts in, I think 3 Fb groups over the past two years, taking my knowledge mostly from Moderators who know there stuff and a few who seem to consistently provide information backed up by a number of others. As many will know, and moderators point out, among the 80 something Immigration Offices, there's always some that decide to make up a rules for themselves, which isn't consistent with other Offices, or the official Immigration laws/rules. Personally, from what I've seen
provides very good accurate advice and I would tend to think that the Immigration Office that you deal with, has one of these 'exceptions to the rule', because I've never heard of anyone not having had to open a Thai bank account and have money as "proof of funds" go into that account, whether it be the full amount of funds, or monthly income. It certainly would be helpful to foreigners, if those high up in Thailand Immigration were to instruct all Officers in all Immigration Offices across the country to follow the rules/laws and not make up their own rules.
I guess that the 3 Capital letters that you used might apply to some, perhaps even yourself, because I wasn't assuming anything. Just pointing out that there's a l fair number of people who do things illegally through an agent, or recommend that path without spelling it out. All I'm doing is making those that aren't aware of the potential dangers of not using one's own money, whether that be you or anyone else. But I guess that you're at least smart enough to not to admit to going an illegal route.
Still, you didn't answer the question that I posed to you, because of there's an easier way to do it legally than in aware of, I still invite you to enlighten me 🤷🏼
my understanding that 40k Baht monthly income is not accepted for the initial visa, nor the first extension with most, if not all Immigration Offices. The way I've understood it explained by those that have a good grasp of all the rules/requirements, in this and/or Thai Visa related groups, is that one has to show 800k in their account for their first Retirement visa and extension. Then just before approval of the first Extension, or straight after, start transferring from overseas, 65k each and every month leading up to the second Extension for the'Income method'. With A Marriage Visa it's same rules, except the amounts are 400k and 40k Baht.
I would suggest reading all the comments. Some will do things the legal way. Others will do things an illegal way,which, down the track, could have serious consequences.