I'm soon doing my 1 one year extension of stay, based on retirement. I have a multiple non O visa. And I also have an Income letter from my embassy. Have the photos and will get the papers to fill in at the Bangkok Immigration. Do I need anything else???

Probably some proof of your address.

You can download and fill out form TM.7 in advance on-line using Word - print on single sheet of A4 paper. Glue photo (4x6cm). Will be accepted.

Take some proof of income in case asked.

Your visa use before date has expired? Or you do not want to make another entry for a new 90 days?

Thanks Lite Beer and lopburi3.

I have already made 5 entries on that visa. It's nearly 11 months old.

But if not expired you could make another entry and postpone extension for 90 days - income letter should be valid for six months.