What is the paperwork required to prove monthly income for an extension for retirement and for marriage to a Thai citizen? It seems to change every year and varies depending which IO you speak to. The list from the Immigration Website is too vague.

Income verification from your embassy in Thailand.

If your embassy does not do that, then you need to provide a 12 month bank statement from the bank, a bank letter from the bank, and an updated bank book. You would need to be able to show 12 months of international transfers in the bank statements.

If for marriage, some immigration offices may require proof of the income, like a pension statement or something similar.

If for marriage, you need to find out if your immigration office accepts monthly transfers, as many will not accept that for marriage extensions. They will only accept proof of your salary for a work permit job in side of Thailand.

No one will ever be able to answer a question like this because each immigration office is different. You did not indicate an immigration office. Also the change from time to time per immigration office.

47 minutes ago, BrandonJT said:

You did not indicate an immigration office

Header states CM Immigration.

58 minutes ago, Maybole said:

What is the paperwork required to prove monthly income for an extension for retirement and for marriage to a Thai citizen?

The documentation for proof of monthly income whether for the reason of retirement or marriage is as outlined by @BrandonJT
The only difference is in the amount of monthly income, 65K or 40K.
1. Embassy Income letter (if available)
OR,

2. 12 month bank statement showing 12 monthly overseas transfers of 65/40K, updated bankbook, and bank letter confirming account details.
Certain Immigration offices request evidence of the source of the income from pension statements.

OP should visit CM IMM and ASK them. They have a handout that specifies all their requirements. I have had no problems fulfilling their required documents

OP, you have correct advice in posts above.

It's a good idea to do the transfers approx same date each month.

I do mine on 14th. Prior to extension obtain a 12 month bank statement and highlight the 12 international transfers.

The requirement does not change each year and the requirements are very clear.

Which method for financials are did you use for current extension?

Thank you all for your replies. I am looking for recent first hand experiences. In my experience the IOs ask for extra documents not listed. Last year I was sent away twice to obtain extras from the bank and when I returned the third time I was told I was too late and to come back tomorrow. Then the IO chastised me for submitting day old documents. Also, the reception desk gave me one list, the document checker added another requirement and the IO inside sent me away for a third, I want to get it correct first time.

9 minutes ago, Maybole said:

Thank you all for your replies. I am looking for recent first hand experiences. In my experience the IOs ask for extra documents not listed. Last year I was sent away twice to obtain extras from the bank and when I returned the third time I was told I was too late and to come back tomorrow. Then the IO chastised me for submitting day old documents. Also, the reception desk gave me one list, the document checker added another requirement and the IO inside sent me away for a third, I want to get it correct first time.

It's almost impossible to prevent that, as (unfortunately) requirements can change even down the specific officer who is processing your application.

3 hours ago, Maybole said:

Also, the reception desk gave me one list, the document checker added another requirement and the IO inside sent me away for a third, I want to get it correct first time.

In your posts you are not being specific in what the io is requiring.

For financials you require 3 things.

12 month bank statement showing 12 monthly transfers of 65k+

Second a "bank letter" That verifies you as owner of the account

And finally updated bank book on day of application.

What was you experience last year obtaining extension income method?

Edit: OP, you had similar thread with different details recently here.

https://aseannow.com/topic/1360567-chiang-mai-immigration/

For best advice you should state clear details of your situation.

Maybe someone who has recently gone thru CM cann tell him what they took.

25 minutes ago, kingstonkid said:

Maybe someone who has recently gone thru CM cann tell him what they took.

The OP has, been to immigration twice and still doesn't know what's needed.

From his other posts appears to be EU.

It's possible that his embassy provides income letter.

Short on details for good advice

On 4/23/2026 at 7:06 AM, DrJack54 said:

OP, you have correct advice in posts above.

It's a good idea to do the transfers approx same date each month.

I do mine on 14th. Prior to extension obtain a 12 month bank statement and highlight the 12 international transfers.

The requirement does not change each year and the requirements are very clear.

Which method for financials are did you use for current extension?

I have a bangkok bank account and prior to LTR 2 years ago, prior to going to immigration I would go to my local CM bank and they would check their document from immigration indication exactly what the bank needed to provide to me for immigration which always made things really easy for me at immigration. I did the 12 monthly deposits method at that time for several years once the embassy stopped providing the income letters. But every time I read the forum about extensions/visits to immigration, it seems things change rapidly. I do recall a few years ago that I had to arrive very early to get in a queue to get a queue number for that particular day. Some people waiting in line indicated that they got in line at midnight. At least that has improved but over the 20+ years of doing this, things have changed even more so and with each new government comes the possibility that more changes to come and not always progress for the expats. But, I am willing to put up with whatever as long as they notify me either via newspapers or this forum. Still paradise compared to other places.

7 minutes ago, Presnock said:

But, I am willing to put up with whatever as long as they notify me either via newspapers or this forum. Still paradise compared to other places.

Certainly is paradise IMO.

As for changes, thinking you will find in reality very little changes.

In recent times there was some acknowledgement forms for penalties etc and form related to marriage.

In reality just a signature (in the main)

You have a LTR so your sitting pretty.

11 hours ago, BrandonJT said:

It's almost impossible to prevent that, as (unfortunately) requirements can change even down the specific officer who is processing your application.

And, in particular, which side of the bed said officer got out of that morning!😴

In the case of marriage extensions, another material factor might relate to constantly changing requirements on the part of those in Divisional HQ who are responsible for signing off applications during the "Under Consideration" period.

11 hours ago, Maybole said:

Thank you all for your replies. I am looking for recent first hand experiences. In my experience the IOs ask for extra documents not listed. Last year I was sent away twice to obtain extras from the bank and when I returned the third time I was told I was too late and to come back tomorrow. Then the IO chastised me for submitting day old documents. Also, the reception desk gave me one list, the document checker added another requirement and the IO inside sent me away for a third, I want to get it correct first time.

You can, I think, be reasonably expected IMHO to do little more than proceed on the basis of a checklist you'll need to draw up including all the extra bank-related docs you were asked for last year, plus the all additional requirements referred to in the (inconsistent) lists provided by the reception desk and document checker, as well as the third one insisted on by the IO you dealt with. Better to run the risk of swamping them with too much paperwork rather than too little, in my experience!

38 minutes ago, DrJack54 said:

Certainly is paradise IMO.

As for changes, thinking you will find in reality very little changes.

In recent times there was some acknowledgement forms for penalties etc and form related to marriage.

In reality just a signature (in the main)

You have a LTR so your sitting pretty.

totally agree with all. When saw the benefits and requirements I realized how lucky I was though I had not had any real problems with the retirement O and over the years, I recall taking that bus to the casino in Cambodia for a few trips while I was living in BKK, then embassy letter and 12 deposits, then no embassy letter. Moving from airport while under renovation and then back with all the associated waits. I was an employee at the US Embassy several times so I do realize what folks sometimes have to go through in order to get a visa and I do not recall complaining about anything I have had to go through so far. Life is good though waiting for some rain to clear the air and cool it down a bit. Take care, appreciate the "official" information you always provide for us on this forum.

18 hours ago, BrandonJT said:

It's almost impossible to prevent that, as (unfortunately) requirements can change even down the specific officer who is processing your application.

Spot on!

You can plan ahead as much as possible to have a complete application package on the day of submission every year, based on previous applications, lists from the Imm Office, etc., but it's not unusual for the IO to ask for something additional to whatever you provided the previous applications. Examples I've encountered over the years:

1. After around 15 years of Support Thai wife applications which included just our UK marriage certificate and certified translation, we were asked for a kor ror 22. We'd never heard of it. Luckily the wife gets on well with the IO, and the IO got the head of office to agree to accept our application without kor ror 22 but future annual applications must include it.

2. Submitted the usual photos in the same positions inside and outside the house for about 18 years, then were told we must have one photo of outside of mooban. Wife got the IO to agree we could email it to her and our application was processed (before we emailed it).

There is also 'how is the the IO feeling at that moment' which is a factor.

All of this uncertainty makes it nerve-wracking no matter how many applications you've made.

To clarify. I attended CM immigration last year with the list I had previously obtained from their Information desk.

As required, I had all the pages from my bank books covering the year up to the day before copied x2

A bank statement covering the full year up to the day before x2.

A guarantee letter from the ban stating it was my account and the balance up to the day of application x2.

That was all there was on the list.

The Document Checker sent me away to obtain 12 months individual statements for each of the previous 12 months.

Inside. the IO sent me away to obtain a 1 years statement of all the income from overseas.

43 minutes ago, Maybole said:

The Document Checker sent me away to obtain 12 months individual statements for each of the previous 12 months.

Inside. the IO sent me away to obtain a 1 years statement of all the income from overseas.

Think little lost in translation.

What they (immigration) is asking for is 12 month bank statement.

In addition if any of the monthly transfers are not shown as international transfers you require "Credit Advice" from bank.

Discussed in this thread.

First post by @lopburi3