The US Tax thing is correct... However I never understood why you have to pay tax to your home country when you don't benefit from it and don't live there?! Pay and don't get anything into return... Pay tax for a green card, no thank you!
BTW: this comes from a European citizen who used to pay more than 50% tax. At least we got good health care, free schooling etc in return!
In Dubai more than 10 years and nothing paying any direct income tax. Even today! Main reason to be here!
Yearly tax free salary without including schooling, accommodation, provident fund; $190.000 / 135.000€. That is for a training position and not including a recent 14 week ($30.000 / 20000€) bonus.