Originally Posted by
Paiteaw
I thought the tax was for international departures only. I am flying within Thailand after arriving in Bangkok.
you are correct; tax does not matter in your case. However on arrival you will officially not have access to international departure areas with F lounge as you do not have a boarding pass for a international flight. You could move to domestic lounge after transit immigration and security, but it has no shower, just food and drinks. From there you can any time head into town