It is a shame that it is not understood better

Mark Bannon - I never thought you were disagreeing - just my way of saying things. I agree with you. But in practice I read many posts and it seems that few Immigration Offices ask for backup financial records.

Again - the inconsistency factor sets in. Using an EWAG - Educated Wild Assed Guess. I say the majority of Immigration Offices accept the Income Affidavit on its face value and do not ask for back up documentation. One can ask here for a show of hands for a particular Immigration Office.

For Americans to get an Income Affidavit /Embassy Income Letter (a sworn statement) for use as proof of Financial ability to meet requirements in the application process for a One Year Extension of Stay for an O Visa - that American only had to swear that they have income of some source outside Thailand stated in USD to meet or exceed the equivalent of 65,000 Baht per month. No documents of any kind are needed to be presented to prove the validity of this income. Furthermore this Income Affidavit is the only document that needs to be presented to Thai Immigration in support of their Extension Application.

My Imm office in Krabi is relatively easy going on this aspect - but read here that other offices are more stringent. So best to clarify at your local office.

Again - check with the local immigration office - they will have a list sheet and instruction sheet.

If your Extension of Stay expires while your out of Thailand - you will need to start again with a new Non Immigrant O Visa 90 days. You will need the same financial proof to do this. You can do this by returning on an Visa Exempt Entry 30 days - Extend 30 days at Immigration - if necessary. Get the financial proof - Embassy Income Affidavit - then many people go to Vientiane, Laos and apply for the Non O at the Thai Embassy. It can be done at the main immigration office in Bkk (this is one of the few actual Visas one can get inside Thailand)

Then you start the one year Extension of Stay in the last 45 days of the 90 day Non Imm O Visa

Normally for an Extension of Stay - over age 50 (Retirement) depending on the Immigration office - the most proof I know of is a lease - rental agreement, photocopy of the landlord's ID Card, and photocopy of the Tambien Ban for the house. Some want a hand drawn map to your house from a relevant landmark. If the house (condo) is owned by the Extension Applicant copies of the House Book - Tambien ban. Other members may have to clarify this.

Very similar - you must have the car Bluebook. There are standard title /ownership transfer Forms... And the link supplied by Si - should do the trick.

You have to make the appointment on line at the US Embassy Website