Today I have extended my Non Immigrant OA for a further 12 months in Chiang Mai. I am Australian. I used the letter of income I obtained in November last year in which I declared income obtained by me from commercial loans made to a company / business in Australia, together with a letter from the borrower confirming the terms of the loan and the repayments made to me.
No Bank Documents or other evidence relating to any money’s coming from outside Thailand was asked for. The whole process took less than 30 minutes including waiting time.