Just something to think about a thai bank will.only guarantee 1 million baht if the bank is in trouble so if you plan on having more than that in your account I would have 2 different accounts at 2 different banks
it depends if you are on a retirement O visa or other long term visa then you do not need any onward travel or departure details the airline will just ask to see your visa. If you are traveling on a visitor visa or visa exempt then you airline may ask for onward travel details but you would need to check with the airline
the question was about filling out the new TDAC on arrival in thailand and whether you have to have a departure date to complete it. A departure date in not mandatory when filling out a TDAC.
It's a Destination Thailand Visa (DTV) and you can extend once in country after your 180 days stay but the paperwork to extend is not worth the effort, it's the same as re applying for the visa. Better to leave the country for a short period then re enter and get a new 180 day stamp.