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Dual Citizenship Thailand × Japan
Status: Restricted
Quick Answer
Not allowed — Nationality Law Art. 14–16 requires choosing one nationality before age 22 (pre-2022 was 20).
Traps to watch
- ⚠️ Adults naturalising to Japan must renounce prior nationality — no exceptions
- ⚠️ 'Choice of Nationality' declaration at Koseki office — in practice many quietly hold two passports (grey area)
- ⚠️ Japan tightened enforcement in 2018 — Nozaki case Osaka District Court upheld constitutionality
- ⚠️ Children born in Thailand hold Japanese nationality if birth registered at embassy within 3 months — must choose by age 22
Taxation
Residence-based (permanent resident > 5 years pays worldwide) · marginal 5–45%
Military
No conscription (Article 9 Constitution)
Renunciation
Free — filed at Koseki or Japanese Embassy Bangkok · 3–6 months
Typical clients
Thai-Japanese dual-heritage nearing 22, prospective Japan naturalisers, spouses of Japanese
Other countries
Consult: 083-249-4999 · LINE @NYC168 · contact@ilc.ltd
Consultation THB 8,500 · Full-service THB 55,000–185,000