Do I need to provide a return ticket when applying for a TR visa in Thailand, even if I plan to extend my stay by 30 days?

all you need is 1900 and /19/%e0%b8%87%e0%b8%b2%e0%b8%99%e0%b8%82%e0%b8%ad%e0%b8%ad%e0%b8%a2%e0%b8%b9%e0%b9%88%e0%b8%95%e0%b9%88%e0%b8%ad%e0%b8%a3%e0%b8%b0%e0%b8%a2%e0%b8%b0%e0%b8%aa%e0%b8%b1%e0%b9%89%e0%b8%99-%e0%b9%80%e0%b8%84/

Been answered so many times before. It’s not Thailand immigration that will have an issue as they know you can extend in country. However your airline may deny you boarding if you don’t have a return or onward flight for the time your visa (or exempt) allows. Not all airlines will care, but you don’t want to be the one caught out at check in. Either check with your airline beforehand or buy a cheap throwaway onward ticket to a neighbouring country that you never use. Many will say that they did it with no issue but probably be better to be safe and ask, or hedge your bet.

Yes

No.

I wouldn't bova verifies already starting

I left in January with a 60 day return flexible ticket and a 60 day TR visa and was questioned if I was going to apply for a 30 day extension. When I extended my visa and tried to rebook a return a month in advance I was advised there were no tickets until July. It’s safer to get a 3 month return ticket if available, the flight caps are creating chaos for anyone wanting to return to Australia. Greg Hunt and Scott Morrison have no idea what they are doing to people.

Been answered many times already, The airline can refuse you if you dont have return ticket on a short term visa or visa exemption