Hi everyone, long time reader, first time poster 
I have been in Taiwan for almost six months now, studying Chinese, and am now applying for English teaching jobs (looking for a legal work ARC).
I have dual nationality: USA and a European country (non-UK). Many English-speaking jobs require a passport of an English-speaking country, which I have. However, when I came to Taiwan, I came with my non-US passport (because it’s much cheaper).
Do I have to enter Taiwan on my US passport in order to be accepted to a cram or regular school to teach? Ie, does my visa (and future resident visa and ARC) have to be in my US passport? Of course I can still provide my employer with a copy of my passport if it’s necessary for a work permit, though as far as Taiwan is concerned, my American self is still in America, so it may create problems if they enter my American passport number in the system.
Has anyone had experience with this?
Because your eligibility for a visa is based on your nationality, you’ll have to reenter on your American passport and get your ARC based on this. Sorry. You can get married on one and your ARC on another, and you can be admitted to a school on one and have your ARC/scholarship on another, but for this one you’ll need to use the same one (since your work rights are linked to your passport).
It seems that you are right. I asked my potential employer and was told my nationality does matter.
However, my six months in Taiwan are almost up… Should I apply for student resident visa/ARC? Once I have an ARC, can I change the nationality on it? (By reentering the country on the US passport.) I think if I leave before my current visa expires and without an ARC, the process would reset completely and I would have no visa at all >_<
Or can I apply for my resident visa with my current passport, then leave the country, then come back and change the nationality and then apply for an ARC? So confusing…
I want to call immigration and ask but it’s typhoon day, so I’ll have to wait until tomorrow. Just looking for ideas…
Sorry for the late reply!
If you want to change passports, the process has to reset entirely anyway. Rather frustrating, but there’s no helping it I’m afraid. You need to make a Hong Kong visa run! (If you haven’t already)