What are the requirements for extending a retirement visa in Phuket using the monthly income method?

This is the relevant section regarding proof of monthly income from the Phuket Immigration Volunteer site for the Retirement Extension (if you are American and thus served by the US embassy which does not issue income letters any longer).

"The following proof of the overseas transfers are required: Signed and stamped bank certificate AND signed and stamped bank statement for the last 12 months and Copy of the bank book of the last 12 months.'

Tod above gives examples of exactly the letters you need. The stamped bank certificate (which proves you are the account holder of the account) is here:

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The above letter also shows the balance of the account on the date the letter was written. That detail is not really needed for proving the monthly income method but it is just a standard feature of this letter. This is one of the letters you need. Exactly this.

The other letter is the summary of monthly deposits which Tod has given an example of here from Bangkok Bank. Exactly this.

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The above is the other letter you need. Some banks may be unwilling to issue such a summary of monthly international transfers and in that case, you will just have to try to make do with a regular bank statement of 12 months duration. Obviously, the Immigration Officer prefers to look at a summary of 12 monthly transfers than dig through a year's worth of bank statement.

Finally, Phuket Immigration always likes to have you copy each page of your bank account passbook (sign each copied page) for the same 12 month period.

One of the things Immigration Officers do in Phuket is to make sure that all the numbers confirm each other. For instance, the balance listed in your bank letter should match an entry in your bank account book for the date the letter was written. Each monthly deposit listed in your summary bank letter should match to an entry (international transfer) in your bank passbook If all these checks confirm each other immigration gets a warm fuzzy feeling that your documentation is in order..

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you need the print out that is stamped by the bank AND you need the "standard bank letter" too

The one that looks like this (that you get when you use banked money method)

You need BOTH the print out of transactions for the year and the bank letter.

When you're using monthly income method you need TWO bank letters :O The "regular" one ( the really short 5 or 6 line letter like you had when you used banked money method) AND then a print out from the bank listing all your international transfers for the previous 12 months