I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

9 minutes ago, BexMan said:

I have just informed them of my new address in Thailand

Ahh well there be's the problem 😋

But seriously I believe it is quite easy to get a Thai TIN number although it may, as like a lot of things depend upon which province you live in.

12 minutes ago, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

Be careful informing them you moved aboard with ISA accounts in the UK, specially with fix term ISA accounts.

7 minutes ago, dayo202 said:

Be careful informing them you moved aboard with ISA accounts in the UK, specially with fix term ISA accounts.

No further additions to your ISA's whilst non-resident in the UK for tax purposes. Pre-existing ISA's continue to benefit from tax relief.

35 minutes ago, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

You have pink ID?

Use that number.

Just tell them you don't have one, I believe this is an acceptable answer at least for a year or two but it depends on who you're talking to.

They will know that unless you have a job that many countries don't issue tax numbers to just anyone who comes along and asks for one.

5 hours ago, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

Not the UK, but Canada. And as 'nodisplayname' suggested, I actually did provide my yellow-book/pink-ID #, with a handwritten/typed caveat that it was not yet activated as my Thai TIN. That pink-ID# with the noted caveat, was accepted by a few Canadian financial institutes.

In fact, that (approach) was pretty much what the Phuket Revenue Department branch told me when they denied my application for a Thai TIN when I applied for such. .... Possibly if i had pushed Phuket RD harder, to activate my pink-ID# as a Thai TIN, they would have activated (or they would have given me a different Thai TIN), but since they stated they saw no need to active such as a TIN yet, I saw no need to push the matter - especially given the Canadian financial institutes accepted my Thai Pink-ID# with noted caveat.

On 8/4/2026 at 5:51 PM, NoDisplayName said:

You have pink ID?

Use that number.

I have a pink card but my TIN is different,so I'd be careful with that advice.

18 minutes ago, CFCol said:

I have a pink card but my TIN is different,so I'd be careful with that advice.

Only reference the pink card number in the absence of a TIN, obviously.

On 8/4/2026 at 5:15 PM, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

Go for a "pink" card. The number on it is your TIN number

The Halifax requested my TIN 6 months ago.

On 8/4/2026 at 5:51 PM, NoDisplayName said:

You have pink ID?

Use that number.

Thanks for the reply.

I don’t have a pink ID, never heard of it until now. Reading about it now, seems requirements vary by office. Has anyone managed to get one from Bang Lamung office? If so, can you remember what they require?

On 8/4/2026 at 12:15 PM, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

Go to the local revenue office — where I live it's in the customs building, same office as registering for v.a.t. — and apply for a Thai TIN. If you are registered in a Yellow House Book, you should show that, so you get same ID as TIN. Remember passport with visa and extension of stay. You'll need a TIN anyways, if staying in the Kingdom more than 180 days within a calendar year.

9 minutes ago, BexMan said:

Thanks for the reply.

I don’t have a pink ID, never heard of it until now. Reading about it now, seems requirements vary by office. Has anyone managed to get one from Bang Lamung office? If so, can you remember what they require?

"Pink ID" is identification car for aliens — normal foreigners, not these 👽 — where you need to be registered in a house book and get a Thai ID-number fist, the house book has a yellow colour as it is for aliens only, not Thai resident, whom are registered in a blue coloured book that follows all houses. You need the house owner's or house master's permission — if you don't own the condo or house yourself — to have your name obtained in a house book. It is the local tessa ban-office that register names in house books and issue a yellow one.

Edited August 6Aug 6 by khunPer
typo

31 minutes ago, BenCrew said:

The Halifax requested my TIN 6 months ago.

Same here...

I give them my UK national insurance number.

Did you inform Halifax you moved to Thailand with a Thai address or UK address ?

30 minutes ago, BexMan said:

Thanks for the reply.

I don’t have a pink ID, never heard of it until now. Reading about it now, seems requirements vary by office. Has anyone managed to get one from Bang Lamung office? If so, can you remember what they require?

There is a thread on here possibly in the Pattaya sub forum all about getting a TIN from the revenue department in Jomtien.

1 hour ago, CFCol said:

I have a pink card but my TIN is different,so I'd be careful with that advice.

The oldfangled paper card TIN's are being phased out. If you have both and are filing Thai taxes, the online system likely will not recognize either number. A visit to your local tax office will have your TIN cancelled and your pinkie activated (phone call to district office) for online system use.

TINs are still available without pinkies, at least for now, they say. To apply, you need to give a reason. Your reason is to file Thai taxes and claim interest withholding tax refund. "I need it for Brussels" may not fly.

That was my experience with TIN paper card from 2016 and pinkie from 2022. YKMV.

On 8/4/2026 at 5:15 PM, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

I went through the same thing three months ago and am still dealing with the consequences of advising my U.K. Investment platform of my overseas address and TIN Number.

I have a Stock’s & Shares ISA, SIPP, Fund & Share account and Easy Access and Fixed Cash savings with one the UK’s leading investment platforms.

As soon as I shared my Thai address and TIN Number access to my cash savings was blocked. No warning, no message to advise. The system just said “Technical Error”. I contacted my provider by secure message multiple times over 8 business days and got at best “woolly” responses. I knew there was no technical error as my British wife was able to still access her cash savings.

I think my cash savings were blocked as I was being subjected to full anti money laundering checks including proof of ID and proof of address. These were conducted by a third party.

Whilst this process was being completed my provider told me I could maintain my ISA, SIPP and Fund & Share account but I could not add any new monies. Fair enough as I expected that.

The real kick in the teeth was when they told me I cannot purchase any new units in U.K. authorised funds. All of my ISA, SIPP and Fund & Share account holdings are in U.K. authorised funds! This means I have basically been “de-platformed” as I am unable to move any of my existing fund holdings to any new U.K. authorised funds.

I have been left with no choice but to find another investment platform. I have done this but had to use a financial adviser as the new platform will not work with clients directly. Most U.K. financial advisers will not/cannot work with expats. Finding an expat financial adviser is a minefield particularly in Asia as many are not qualified or even experienced financial advisers.

The platform I am moving to is regulated by the U.K. FCA and offers a SIPP that existing SIPP’s can be transferred to without losing the tax wrapper. I believe it is also the only platform available to expats that can accept ISA transfers without losing the tax wrapper. Both the SIPP and ISA can be moved to another U.K. investment platform should you become a U.K. tax resident in the future.

After 3 months of going through a rigorous application process and being AML checked by my financial advisers firm and the new investment platform my SIPP is now in the final stages of being transferred using Origo an automated system used for pension transfers in the U.K.

But even that isn’t simple as my current investment platform will not let the transfer go through automatically and have advised my new platform they need to complete a number of checks on my account first.

ISA and Fund & Share accounts should be much simpler and quicker.

Hopefully you will not encounter similar problems but if you do feel free to DM me and I will share the name of the new investment platform and my expat financial advisers details.

5 hours ago, dayo202 said:

Same here...

I give them my UK national insurance number.

Did you inform Halifax you moved to Thailand with a Thai address or UK address ?

They have my Thai address.

7 hours ago, skorts said:

I went through the same thing three months ago and am still dealing with the consequences of advising my U.K. Investment platform of my overseas address and TIN Number.

....

The real kick in the teeth was when they told me I cannot purchase any new units in U.K. authorised funds. All of my ISA, SIPP and Fund & Share account holdings are in U.K. authorised funds! This means I have basically been “de-platformed” as I am unable to move any of my existing fund holdings to any new U.K. authorised funds.

I have been left with no choice but to find another investment platform.

I wonder if this is more likely due to your residence being Thailand, and not the UK, ... and not so much having a Thai TIN?

A few years back I went through something similar with Canada. I had (what for me was) a very substantial amount of money in a Canadian RRSP (self directed) which I believe are approximately similar to a UK SIPP and I also had money in a Canadian margin trading account.

This was with Bank of Montreal (BMO) trading division.

They discovered I was living in Thailand mostly due to some communication of theirs with Canada Revenue Service (ie the Canadian tax people) as i yearly file a Canadian tax return . (I did not initially tell BMO - I was using my sister's address - which is where i stay when visiting Canada).

Both my margin account and RRSP were then 100% frozen by them.

I contacted them - they insisted I confirm and prove my residence, and given my residence now Thailand, they only partly unfroze my accounts.. I was not allowed to open new positions, I could only sell existing positions, or withdraw money. I contacted all the other Canadian Banks and they all had the same policy (or worse - not allow me to open a new account). For over a year I scratched my head, puzzling how to handle this, making next to no money (only interest and some existing long term stock profits ) off of a gradually dwindling stock portfolio with a large cash position. Less than 5% profit per year which for me, is not great.

Companys like Interactive Brokers don't handle Canadian RRSPs/RRIFs.

Finally i was clued in to a Canadian Financial institution (soon to become a new Canadian bank) that would allow me to transfer my self directed RRSP to them and transfer my margin trading account to them. They only allow this for Canadian citizens which was relevant and fortunate for me. It worked out well, ... I transferred my RRSP and margin trading account to them. A bit later I converted my RRSP (like a SIPP Self-Invested Personal Pension) to an RRIF (like a SIPP in Flexi-Access Drawdown) and in two years my self directed RRIF, due to my (frankly conservative) trading, increased 44% in value (ie over 20% per year) and my margin trading account in 2 years increased about 56% in value (ie over 25% per year) also due to some rather conservative trading. If i had been more aggressive I could have done better - but that is not the point.

The point is finding a new financial institute was 100% essential.

I went from making less than 5% per year (when BMO in essence froze my trading - which was massively painful and annoying) to making a lot more money - which gives me more to spend in my remaining years (such as now only flying business class, and other perks to use up my earned money). ... I would have moved my funds over sooner, had i known the new financial institute would accept my account ... I did not know, despite spending a fair amount of time, looking. There is more to this story ... but my advice ...

My advice - if you can ... find another investment platform.

Good luck.

Edited August 6Aug 6 by oldcpu

11 hours ago, BenCrew said:

The Halifax requested my TIN 6 months ago.

Virgin One (Now RBS) requested mine 4-5 years ago, ended up getting one in 2022.

10 hours ago, NoDisplayName said:

The oldfangled paper card TIN's are being phased out. If you have both and are filing Thai taxes, the online system likely will not recognize either number. A visit to your local tax office will have your TIN cancelled and your pinkie activated (phone call to district office) for online system use.

TINs are still available without pinkies, at least for now, they say. To apply, you need to give a reason. Your reason is to file Thai taxes and claim interest withholding tax refund. "I need it for Brussels" may not fly.

That was my experience with TIN paper card from 2016 and pinkie from 2022. YKMV.

Absolutely bloody outrageous if this means that I'll need to go through the bureaucratic hassle of obtaining a pink ID card at my local amphur, just so as to be able to file nil tax returns based on current exemptions and allowances! When and if I find myself unable to file a tax return based on my existing paper TIN, I'll simply stop bothering to file tax returns period.

Yet another example of how officialdom here in LOS is IMHO going out of its way with zeal and gusto to make life just as difficult as it humanly can be for normally law-abiding foreigners, thus forcing them to go under the radar and take their chances. 🤬

Edited August 6Aug 6 by OJAS

15 minutes ago, OJAS said:

Absolutely bloody outrageous if this means that I'll need to go through the bureaucratic hassle of obtaining a pink ID card at my local amphur, just so as to be able to file nil tax returns based on current exemptions and allowances! When and if I find myself unable to file a tax return based on my existing paper TIN, I'll simply stop bothering to file tax returns period.

Yet another example of how officialdom here in LOS is IMHO going out of its way with zeal and gusto to make life just as difficult as it humanly can be for normally law-abiding foreigners, thus forcing them to go under the radar and take their chances. 🤬

I wouldn't get all lathered up just yet. Pink ID's supersede paper cards, but the paper TIN is still available for those without pinkies, and will probably hang around for decades............like the paper lifetime drivers license held by the 67yo half-blind school bus driver with only basic insurance that hit us undertaking in the emergency lane last month.

40 minutes ago, NoDisplayName said:

I wouldn't get all lathered up just yet. Pink ID's supersede paper cards, but the paper TIN is still available for those without pinkies, and will probably hang around for decades............like the paper lifetime drivers license held by the 67yo half-blind school bus driver with only basic insurance that hit us undertaking in the emergency lane last month.

Thanks, that's good to know. The first thing I did with my brand new paper TIN was to get it laminated in the expectation that it would see me out!

11 hours ago, oldcpu said:

I wonder if this is more likely due to your residence being Thailand, and not the UK, ... and not so much having a Thai TIN?

A few years back I went through something similar with Canada. I had (what for me was) a very substantial amount of money in a Canadian RRSP (self directed) which I believe are approximately similar to a UK SIPP and I also had money in a Canadian margin trading account.

This was with Bank of Montreal (BMO) trading division.

They discovered I was living in Thailand mostly due to some communication of theirs with Canada Revenue Service (ie the Canadian tax people) as i yearly file a Canadian tax return . (I did not initially tell BMO - I was using my sister's address - which is where i stay when visiting Canada).

Both my margin account and RRSP were then 100% frozen by them.

I contacted them - they insisted I confirm and prove my residence, and given my residence now Thailand, they only partly unfroze my accounts.. I was not allowed to open new positions, I could only sell existing positions, or withdraw money. I contacted all the other Canadian Banks and they all had the same policy (or worse - not allow me to open a new account). For over a year I scratched my head, puzzling how to handle this, making next to no money (only interest and some existing long term stock profits ) off of a gradually dwindling stock portfolio with a large cash position. Less than 5% profit per year which for me, is not great.

Companys like Interactive Brokers don't handle Canadian RRSPs/RRIFs.

Finally i was clued in to a Canadian Financial institution (soon to become a new Canadian bank) that would allow me to transfer my self directed RRSP to them and transfer my margin trading account to them. They only allow this for Canadian citizens which was relevant and fortunate for me. It worked out well, ... I transferred my RRSP and margin trading account to them. A bit later I converted my RRSP (like a SIPP Self-Invested Personal Pension) to an RRIF (like a SIPP in Flexi-Access Drawdown) and in two years my self directed RRIF, due to my (frankly conservative) trading, increased 44% in value (ie over 20% per year) and my margin trading account in 2 years increased about 56% in value (ie over 25% per year) also due to some rather conservative trading. If i had been more aggressive I could have done better - but that is not the point.

The point is finding a new financial institute was 100% essential.

I went from making less than 5% per year (when BMO in essence froze my trading - which was massively painful and annoying) to making a lot more money - which gives me more to spend in my remaining years (such as now only flying business class, and other perks to use up my earned money). ... I would have moved my funds over sooner, had i known the new financial institute would accept my account ... I did not know, despite spending a fair amount of time, looking. There is more to this story ... but my advice ...

My advice - if you can ... find another investment platform.

Good luck.

Thanks for sharing your experience, that does sound similar.

I am in the final stages of moving my SIPP to the new investment platform. Once that is done my ISA and Fund & Share account will follow.

The outrageous thing is the way they instantly froze my cash savings without telling me. I have been a customer of theirs for c.25 years but was treated like a criminal. All of those cash savings have now been moved out of their platform apart from two fixed rates which mature over the next few months.

Bottom line is their investment platform and products are designed for U.K. residents only.

On 8/4/2026 at 5:15 PM, BexMan said:

I hold some ISAs in the UK with an investment company. I have just informed them of my new address in Thailand and now they are asking for a Thai TIN. Has anyone else been through this process?

Not an answer to your question, but it might not have been the best idea to inform them that you are now living in Thailand. As I understand it, only UK residents can have ISA's.

Of course, if you will not be applying for any more in the future, my reply in moot.

38 minutes ago, skorts said:

Bottom line is their investment platform and products are designed for U.K. residents only.

Can you share which Investment Platform you use?

I use Barclays and know that they'll look to close my accounts if I tell them I'm Non UK Tax Resident, Irony being that it was they that made me Nom-UK Tax Resident 19 years ago & at that time advised me to use my Parent's address, which I've been doing eversince.

21 hours ago, NoDisplayName said:

The oldfangled paper card TIN's are being phased out. If you have both and are filing Thai taxes, the online system likely will not recognize either number. A visit to your local tax office will have your TIN cancelled and your pinkie activated (phone call to district office) for online system use.

TINs are still available without pinkies, at least for now, they say. To apply, you need to give a reason. Your reason is to file Thai taxes and claim interest withholding tax refund. "I need it for Brussels" may not fly.

That was my experience with TIN paper card from 2016 and pinkie from 2022. YKMV.

Got my paper TIN in 2023. File my taxes in person at local revenue office. No problems.

44 minutes ago, skorts said:

The outrageous thing is the way they instantly froze ..

Yes. It was like that with me also.

They even locked me out of my account for a while. I had to phone long distance from Thailand, verify my identity via many questions, after which they demanded residency proof, noting they had reason to believe I didn't reside in Canada anymore.

They also after being satisfied with my Thailand residency proof, demanded my Thai tax ID. I had previously failed to get a Thai tax ID ( mind you I didn't press the Thai RD very hard for the TIN), and that is where the Thai RD official comment that my pink ID # could be my tax ID if he had it activated, came in handy. I passed that to BMO, and I only then could access my cash and close equity positions.

But BMO still wouldn't let me open new positions. I then started my long hunt to find a different financial institution that would accept my RRSP and margin account and allow me to actively trade again. The "on paper " loss of trading income during that period of time was relatively significant. Thankfully I eventually found an institution that allowed me to trade despite my being a resident of Thailand.

Glad to read you are making progress.

Edited August 7Aug 7 by oldcpu

1 hour ago, SamSpade said:

Can you share which Investment Platform you use?

I use Barclays and know that they'll look to close my accounts if I tell them I'm Non UK Tax Resident, Irony being that it was they that made me Nom-UK Tax Resident 19 years ago & at that time advised me to use my Parent's address, which I've been doing eversince.

I checked before coming to Thailand and was advised by Hargreaves Lansdown that you can keep the account. No additions to ISA allowed, can remains non taxable in UK.