@Darin *******
Australians cannot get an affidavit of income from their embassy in Bangkok. You can get the 90-days Non-O retirement visa issued in your home country, using original income documents, but you cannot use these in Thailand! So the only way to apply for the 1-year Extension of Stay Permit based on Retirement on Immigration in Thailand, is using a deposit of a minimum of 800,000 THB in your Thai bank account, seasoned for two months. If you don't have the funds, pay an agents to "circumvent" it (pay a bribe to the Immigration) but be warned it will cost you dearly and you won't be able to get out of the agent hamster wheel so easily