Okay one important thing for ALL of you to realize is. There is NO mystique in your US passport. You are pretty much the same as a person who enters into Taiwan who enters into TW using an "Overseas Chinese Status" passport. The key difference is, ROC passport holders have to apply for EXIT permits at immigration.
Some important tips if you didn't read it in my blog (ROCGUIDE.blogspot.com)
1.) DON'T LISTEN TO RELATIVES OR THE COMMON PERSON. Please ask a LAWYER, immigration, Military service office, OR anyone with knowledge of this issue. Your relatives and many people will tell you that you're a US or Western Citizen so they can't find you. First of all, while the TW government is pretty incompetant to Typhoon responses. However, they are extremely able in drafting you and hunting you down for taxes. (Hence like most governments they seem at their best when they want to milk something out off you).
I was pretty much force fed crap like "Oh you have an ARC you don't need to leave every four months" or "Yeah you're not a citizen you just have a number they don't know you are back". LUCKILY for me I found out I can only reside here for under a year and live for over 4 months THREE times. I also found out if I wasn't skeptical I probably would have needed to do the Army service. Cause Taiwan is no different than most countries, where the majority of citizens are very ignorant and unaware of the laws. I've always been a bit on the cautious side and this time I am happy I was cautious!
Honestly my dad and many people were shocked when I was refused an ARC renewal. I hoplessly and vainly tried to explain it to them that my US passport and ROC ID were intertwined. They stubbornly refused to believe it until they called up immigration and the military service office, and the respective individuals from those two divisions verified my assumptions. It's scary, because it just shows how unaware people are of the laws.
2.) Well I am okay if I don't stay past my ARCs expiry date.
That is ALSO wrong. The ARC gives you the right of residency, opening of bank accounts, and application of Cellphone plans or net services. It also gives you the right of health insurance as well. IT DOESN'T give you the right to duck the army. If you were ever once a TW citizen, that's for life unless you renounce it and the AIT acknowledges that too. You are still bound by the conscription laws and if you have an ARC(those of you who got it before Feb of 2009 and are dual nationals) remember if you were born before 1984 and you are on your last strike PLEASE leave every 4 months(even if you aren't just do it). If you were born after 1984 you better tell your employer that you can only work half the year.
3.) THE FOREMOST ISSUE OF ALL. YOUR US PASSPORT DOES NOT HAVE MYSTIQUE. THE ROC GOVERNMENT KNOWS YOU ARE A TW CITIZEN REGARDLESS OF WHAT PASSPORT YOU ENTER WITH. DON'T ASK QUESTIONS OF "WELL HOW DO THEY KNOW" THEY FLAT OUT JUST KNOW FOR MANY REASONS. ONE YOU NEED TO USE YOUR TW ID TO APPLY FOR GREEN CARDS OR US CITIZENSHIP. THE US GOVT WILL PROBABLY INFORM THE TW GOVERNMENT THAT YOU ARE NOW A CARD OR US CITIZEN. DON'T VIEW THE ROC GOVERNMENT IN AN ETHNOCENTRIC WAY BECAUSE YOU ARE SOME WESTERN EDUCATED MAN. THEY ARE NOT INCOMPETANT FOR THIS TASK AND THEY CAN HUNT YOU DOWN RAPIDLY AND QUICKLY.