7 minutes ago, essex boys said:

My marriage certificate was issued using my Irish passport, I don’t want to cause issues further down the line.

Marriage certificate (Kor Ror 3) has no mention of passport number.

9 minutes ago, essex boys said:

I did think that maybe I could come back in to Thailand using my irish passport get my 60 day visa waiver stamp, then go to immigration and apply for my non o based on marriage

Go to the bank to get a statement and account certificate for Immigration, they want your passport ........... it's not the passport registered to your account .............. and you're now a Tourist, with a VE entry stamp no longer Non Immigrant status.

Not a good idea, you're inviting problems.

This is all proving to be a bloody headache to be honest, is it possible to change my retirement visa/ extension to a marriage visa / extension in my existing uk passport

3 minutes ago, essex boys said:

This is all proving to be a bloody headache to be honest, is it possible to change my retirement visa/ extension to a marriage visa / extension in my existing uk passport

4 minutes ago, essex boys said:

Yes. The process to change from based on retirement to based on marriage is possible.

Apart from extra docs required the wife needs to attend immigration.

If you want to use income method then as I posted earlier you do the change to marriage extension using 400k seasoned for two months and in addition start the monthly transfers.

For the next extension you can switch to income method by showing 12 monthly transfers from abroad.

Having stated that the funds in bank method is not difficult.

400k for two months.

Low bar compared to retirement requirements.

Alternatively you could remain on extension retirement and start the monthly transfers when applying for next extension. 65k/month + maintain funds in bank requirements.

I recently did this.

3 hours ago, essex boys said:

This is all proving to be a bloody headache to be honest

For you, or for us? 🤣

3 hours ago, essex boys said:

is it possible to change my retirement visa/ extension to a marriage visa / extension in my existing uk passport

Yes.
When completing the TM7 form, state the 'reason' for the extension as Thai spouse (as opposed to retirement).
The financial requirement is 400K THB deposited in a Thai bank for two months, but as you currently hold an extension based on retirement, you'll have to provide a 12 month statement as evidence you complied with the conditions of your current extension, that is, maintained a balance of 800K for 3 months after it was issued, then a minimum of 400K for the remaining 7 months. The following year, you will only need to provide evidence of 400K for 2 months on the date of submitting the application.

Extensions based on Thai spouse cannot be approved at local IO level, they are sent to the regional office for approval.
You will receive a 30 day 'under consideration' stamp to return on the given date to obtain the extension stamp.

Other differences are that your spouse must attend the application, slightly more documentation is required, as well as 2 complete sets, one for your local IO, one for the regional office.

You will most probably receive a home visit, and at least 2 witnesses will be required.

10 hours ago, Liquorice said:

Marriage certificate (Kor Ror 3) has no mention of passport number.

My marriage certificate (Kor Ror 3) has my passport number on the back.

4 hours ago, Mutt Daeng said:

My marriage certificate (Kor Ror 3) has my passport number on the back.

Im going to check mine later, when I filled in the affirmation to marry paperwork they wanted to see my passport at the Irish embassy, so if it has my Irish passport number on it I won’t be able to,e to change my extension based on retirement to based on marriage

1 hour ago, essex boys said:

Im going to check mine later, when I filled in the affirmation to marry paperwork they wanted to see my passport at the Irish embassy, so if it has my Irish passport number on it I won’t be able to,e to change my extension based on retirement to based on marriage

Of course, you can still change the reason for extension application.

It matters not what ID you used to register a marriage at an Amphoe, it's the ID that's registered with Immigration that matters.
My passport number used to get married appears on my Kor Ror 2, but is different from that registered with Immigration because I since renewed my passport and updated my information with Immigration by transferring the stamps from old to new passport.

You're using your UK passport to extend which is already registered in Immigrations system.

1 minute ago, Liquorice said:

Of course, you can still change the reason for extension application.

It matters not what ID you used to register a marriage at an Amphoe, it's the ID that's registered with Immigration that matters.
My passport number used to get married appears on my Kor Ror 2, but is different from that registered with Immigration because I since renewed my passport and updated my information with Immigration by transferring the stamps from old to new passport.

You're using your UK passport to extend which is already registered in Immigrations system.

Ok, so when I registered my marriage I used my Irish passport for all the paperwork, so my Irish passport number will no doubt be on my marriage certificate somewhere, can I now change from retirement to marriage even though my marriage certificate will almost certainly have my Irish passport number on it

On 1/12/2026 at 7:34 AM, BrandonJT said:

Very first thing I recommend you to do is go open a new bank account at a different bank immediately. Do not use Bangkok Bank for marriage visas/extensions.

If you plan to apply for a non-O visa conversion inside of Thailand, you need to check that your immigration office allows this. If they do, ask them for their list of handouts of the requirements. Most immigration offices require the funds be in your bank for 2 full months at the time you apply for the visa. SOME immigration offices (Jomtien) require the money to be in your account for 3 months at the time of application to convert to non-O visa.

You will also need between 14-21 days left on your existing permission to stay. So that means you should get the requirements from your immigration office to know how early you have to apply after you get your 30-day extension. You cannot wait until the end of that 30 days to apply, or they will not even accept your application.

Finally, the reason I said you need to switch banks, is that Bangkok Bank will not give you the required bank letter if the funds have not been in your bank account for 4 months when you request the letter. In order to receive the letter, you will have to sign a document allowing them to freeze those funds in your bank account for 4 months from when you receive the letter. That means between the 2-3 months you need to apply for your extension, and the extra 4 months the bank will required, your funds will be stuck for 6-7 months.

No other bank does this, and that means for marriage you only need to meet the financial requirements for 3 or so months each year.

Any particular reason/s you mention " Do not use Bangkok Bank for marriage visas/extensions" ?

And concerns only marriage visas/extensions and not any other visas, like visa based on retirement?

1 minute ago, essex boys said:

Ok, so when I registered my marriage I used my Irish passport for all the paperwork, so my Irish passport number will no doubt be on my marriage certificate somewhere, can I now change from retirement to marriage even though my marriage certificate will almost certainly have my Irish passport number on it

Yes, many expats that married years ago used a different ID to that now registered with Immigration.
It's a given fact that passports need replacing every 10 years or less, that doesn't invalidate your marriage or driving licence just because the ID number changed.

For an extension based on marriage, you will need an updated KR2 from your local amphoe, so supply a copy of the date page of your Irish passport as evidence.

If in the future you want to switch to your Irish passport for extensions, then the time to do that is when planning a trip out of Thailand.
With a re-entry permit in your UK passport, when reentering present both passports. The IO will put an entry stamp in your Irish passport, then take both passports to Immigration to have the stamps from your UK passport transferred to your Irish passport. You can now use your Irish passport for extensions.
Immigration keep a record of all passport numbers, new and old.

6 minutes ago, ravip said:

Any particular reason/s you mention " Do not use Bangkok Bank for marriage visas/extensions" ?

And concerns only marriage visas/extensions and not any other visas, like visa based on retirement?

Most likely because extension marriage only requires funds in bank for two months prior + under consideration period.

However BBL are freezing accounts for 4 months to provide income letter.

Not really an issue for extension retirement as the funds need to maintained for 2 months prior + 3 months post application.

Given that they must also be 400k + in other months, many folk just park the 800k in dedicated account.

12 minutes ago, ravip said:

Any particular reason/s you mention " Do not use Bangkok Bank for marriage visas/extensions" ?

And concerns only marriage visas/extensions and not any other visas, like visa based on retirement?

If the funds haven't been in a Bangkok bank account for 4 months before requesting the account balance certificate for Immigration, then Bangkok bank will freeze the 800/400K for 4 months.
The financials and conditions are different for extensions based on retirement and marriage.
Retirement the 800K funds must remain in the account for 3 months after the extension is issued.
Marriage the 400K funds can be withdrawn immediately after the extension is issued.
Therefore, Bangkok bank's policy of freezing accounts impacts extensions based on marriage more than those based on retirement.

2 hours ago, essex boys said:

Im going to check mine later, when I filled in the affirmation to marry paperwork they wanted to see my passport at the Irish embassy, so if it has my Irish passport number on it I won’t be able to,e to change my extension based on retirement to based on marriage

I have seen a few reports on other forums with reference to this, if you open an account with a UK passport then you need a UK passport to operate that account, updating your Bank account with a UK passport is ok, trying to operate a bank account with a different countries passport, the banks will not accept that, if you try expect to see your account to be frozen as suspected fraud, it took one guy months of paperwork to sort out, i am also a dual Brit/Irish passport holder 2 years ago i had a similar plan to swop passports, my G/F said it would be a problem with the bank, i am with BKK, i asked and they said NO, the account must operate with the passport country it was opened with, given the current situation with banks and fraud. it is a brave person to try

46 minutes ago, Liquorice said:

Yes, many expats that married years ago used a different ID to that now registered with Immigration.
It's a given fact that passports need replacing every 10 years or less, that doesn't invalidate your marriage or driving licence just because the ID number changed.

For an extension based on marriage, you will need an updated KR2 from your local amphoe, so supply a copy of the date page of your Irish passport as evidence.

If in the future you want to switch to your Irish passport for extensions, then the time to do that is when planning a trip out of Thailand.
With a re-entry permit in your UK passport, when reentering present both passports. The IO will put an entry stamp in your Irish passport, then take both passports to Immigration to have the stamps from your UK passport transferred to your Irish passport. You can now use your Irish passport for extensions.
Immigration keep a record of all passport numbers, new and old.

Ok just to be clear, im currently on a retirement extension using my uk passport, when I got married I used my Irish passport for all the paperwork, I now want to change my retirement extension to marriage extension, in my uk passport but my passport number on my marriage certificate will be my Irish passport number…will this be a problem?

7 minutes ago, essex boys said:

Ok just to be clear, im currently on a retirement extension using my uk passport, when I got married I used my Irish passport for all the paperwork, I now want to change my retirement extension to marriage extension, in my uk passport but my passport number on my marriage certificate will be my Irish passport number…will this be a problem?

Why should it be.

My passport number and that of thousands of others used for Immigration doesn't match the passport ID number used to get married.
Immigration are only concerned with an updated KR2 from an Amphoe as evidence that since you legally married, there is no record of divorce.
If in doubt supply a copy of the data page of your Irish passport which will match any ID on the KR2.

As a dual national, you just used your Irish passport to marry, but now use your UK passport for extensions.

Just because you used a different ID to get married doesn't mean you're not legally married in Thailand.

1 hour ago, howerde said:

I have seen a few reports on other forums with reference to this, if you open an account with a UK passport then you need a UK passport to operate that account, updating your Bank account with a UK passport is ok, trying to operate a bank account with a different countries passport, the banks will not accept that, if you try expect to see your account to be frozen as suspected fraud, it took one guy months of paperwork to sort out, i am also a dual Brit/Irish passport holder 2 years ago i had a similar plan to swop passports, my G/F said it would be a problem with the bank, i am with BKK, i asked and they said NO, the account must operate with the passport country it was opened with, given the current situation with banks and fraud. it is a brave person to try

I think the issue here is that they didn't enter the Country using their other ID and/or didn't visit Immigration beforehand to have their stamps transfers to the new passport.

Just because you use an additional passport doesn't change your identity of who you are, only the nationality changes.
Presenting old passport and new passport with stamps transferred shouldn't be a problem.

If it is, then simply go to another bank to open a new account.
Provided you have evidence of an original Non O visa and a long-term extension, in the passport you're using to open the account, that shouldn't be an issue.

2 hours ago, DrJack54 said:

Most likely because extension marriage only requires funds in bank for two months prior + under consideration period.

However BBL are freezing accounts for 4 months to provide income letter.

Not really an issue for extension retirement as the funds need to maintained for 2 months prior + 3 months post application.

Given that they must also be 400k + in other months, many folk just park the 800k in dedicated account.

2 hours ago, Liquorice said:

If the funds haven't been in a Bangkok bank account for 4 months before requesting the account balance certificate for Immigration, then Bangkok bank will freeze the 800/400K for 4 months.
The financials and conditions are different for extensions based on retirement and marriage.
Retirement the 800K funds must remain in the account for 3 months after the extension is issued.
Marriage the 400K funds can be withdrawn immediately after the extension is issued.
Therefore, Bangkok bank's policy of freezing accounts impacts extensions based on marriage more than those based on retirement.

Thank you very much for the information. When I read the OP was a bit worried as I have only a Bangkok Bank account which I opened in 2016.

Yes, I too do the same thing - park the 800k in a dedicated account.

3 minutes ago, ravip said:

Yes, I too do the same thing - park the 800k in a dedicated account.

In your case (which applies to many) BBL freezing account means nothing as the funds are parked.

Unfortunately there are some married guys that rely on access to their 400k ASAP.

Previously there have even been posts asking can I use some of the 400k during under consideration period.

1 minute ago, ravip said:

Yes, I too do the same thing - park the 800k in a dedicated account.

If you park the 800/400K requirements throughout the year then you are not affected by Bangkok banks new policy.

Ok, I think I have the answer I needed, I have spoken to Khon Kaen immigration today, I told them i’m on a uk passport and extension of stay based on retirement, but I want to change to a marriage extension at my next renewal which is in may, but my marriage certificate will have my Irish passport number on it, I have the required 400k sat in my Bangkok bank account and it’s been there for a few years ( actually it’s 800k to cover my retirement financials) they said it’s not a problem but to call them 1 month before renewal and they will Give us the list of documents that they require….

I would like to thank you all for your replies and suggestions and help, particularly @Liqorice & Dr Jack who must have dreaded it when I asked yet another question, many thanks for your time, patience & efforts.

The only thing left to do is visit Bangkok bank and update my account with my new uk passport number, and look for another bank to put the other 400k in

2 hours ago, essex boys said:

they said it’s not a problem

I won't state 'told you so' ........... but I told you so. 😂

2 hours ago, essex boys said:

The only thing left to do is visit Bangkok bank and update my account with my new uk passport number, and look for another bank to put the other 400k in

Open a new account, then transfer the funds from the other account.
That way, they have stayed in a Thai bank account to meet the requirements.

On 1/14/2026 at 1:21 PM, Equatorial said:

. Before leaving Thailand, I would open an account with Kasikorn Bank and transfer 400k there.

I'm curious about opening an account at K Bank

On 1/14/2026 at 1:21 PM, Equatorial said:

I lived and worked in Bangkok for 7 years... Have BKI Bank and even 350ktyb k-bank credit cards...

On 1/14/2026 at 1:21 PM, Equatorial said:

K Bank sill won't give me a bank account there because I didn't nt work for n Thailand... Is there some secret code to getting a seemingly unobtainable K Bank savings account?