Taiwan passport is split into two different kinds: ones with National ID numbers (身分證) and ones without. The ones without ID numbers are usually issued to Overseas Taiwanese folks who have Taiwanese parents (usually ABCs, CBCs, but can be anyone whose Taiwanese parents moved abroad and had them).
If the process of claiming nationality is done when the person claiming is <20 yo, then they can go straight to citizenship, and have their name registered on the parents household registration. If the process is done when the person claiming is >20, which is the case for a lot of folks on the forum, then we are:
- First issued a Taiwan Passport WITHOUT National ID number (Without Household Reigstration)
- Have to go in, get a permanent residency card (called a TARC - Taiwan Area Resident Certificate)
- Establish residency (1 year without leaving, 2 years staying 270 or so days each year, or 5 years staying 183 days each year)
- THEN, register onto a household, of which would make me a national withhousehold registration, and eligible for the draft should I be 36. Or is it 37. Anyway the specifics at the margin I’m not sure of but that’s the general idea.
TL;DR: Having TW passport doesn’t mean we have household registration, at least not for Overseas Chinese folks.