Is there a restriction on income levels for a non-immigrant O volunteer visa in Thailand? I understand that you are not allowed to receive a salary and the income should be to cover accommodation, food, and other small expenses. I couldn't see a guideline anywhere. Obviously, accommodation costs can vary greatly so I was wondering at what point approximately, would income levels for a volunteer with a working permit, working for a foundation, become a working non-immigrant-B visa in terms of income levels if that makes sense. LOL could be a bit like how long is a piece of string.