Short answer: many Taiwanese families keep travelling between Taiwan and the US after getting green cards. Three things to watch: two years abroad in a row generally moves your Taiwan household registration out, affecting health insurance and other rights; green card holders report worldwide income to the US; and you may still be a Taiwan tax resident.
Household registration and health insurance
| Situation | General effect |
|---|---|
| Abroad under two years | Registration kept |
| Abroad two years in a row | Registration generally moved out |
| After it’s moved out | Health insurance generally lost; restored only after re-registering and meeting conditions |
Green card holders must keep the US as their permanent home, so long stays in Taiwan can also affect the green card — see long absences from the US.
Taiwan tax residence
Generally, you are a Taiwan tax resident if:
- you have household registration in Taiwan and stay 31+ days in the year, or 1–30 days with your life and economic centre in Taiwan; or
- you have no registration but stay 183+ days in the year.
Taiwan tax residents report Taiwan income, and overseas income may count toward the alternative minimum tax.
US tax
Green card holders are US tax residents and generally report worldwide income wherever they live — see green card tax duties. Double-tax arrangements between Taiwan and the US are still developing, so families with income in both should use an accountant who knows both systems.
Practical tips
- Plan your time in the US and Taiwan each year.
- Decide whether to keep Taiwan registration and health insurance.
- Have accountants on both sides coordinate filings.
- Keep your travel records.
General information only, not tax or legal advice. As of October 2026.