t most certainly has nothing to do with the country where your students are located.
It has to do with your own country of residence (or in the case of the US, country of citizenship).
If you are American, I believe you have to pay taxes on your worldwide income even if you are not residing in America except for the tax treaties that the US has with a lot of countries where you wouldn't have to pay the IRS if you legally paid taxes in another country that has a treaty, but I am not 100% sure about that.
Tell a Friend

There's a few Americans here that I barely know but they have told me that they still have to cough up to the American treasury. They are all teaching in this country so will have to pay PAYE.They wouldn't consider me a friend, so it might be rude if I quizzed them further. I was interested by your 'treaty'

You'd think Microsoft could bring the Internet to its knees in China. They all use Fake Windows, and doesn't sKype also belong to Microsoft?