What should my wife do if her Non-B visa is expiring and her work permit is delayed?

Singapore also imposes certification of tax clearance before a foreigner can leave the country.. if your employment pass (or other work permit) is cancelled you cannot travel if there is an outstanding tax liability.. your passport is blocked by immigration!

Best option is to fly out of Thailand then return with a Tourist 60 day stamp. No border run because they treat those differently. Stay at least one day out of Thailand day then return tell immigration you will do a new visa type later. It's more expensive but it's better because they will give you a new tourist visa and then need to do a new Non B visa once school sorts out their process. I've seen guys try go Laos with Non B but then they ask for loads of stuff and it's much better to just leave Thailand, which cancels your Non B, and start over. As long as she doesn't have a work permit and extended visa then she's ok. Singapore has got 8k return flights or try Malaysia or anywhere. 😎

Hi..just do visa run in Cambodia..who told you about that tax clearance? That's not true..and why the sch did not do anything extend her work permit?..renewal of WP is very easy..bcs it is just to submit the same docs as her previous visa with the new contract & with new validity on it..my school renews my WP and visa as early as 1 month before it's expires.i am working in the same sch for almost 7 years now.renewal of WP and visa is the easiest thing to do rather than to go to Lao and process new non b again and process new WP again.she must go out Thailand today or else she will be fined 5h/day kha

And who told you that? A country can't keep you hostage over a slip of paper, and there's no requirement to show a tax clearance paper to leave the country.