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Dual Citizenship Consultation — 10 Country Deep-Dive
Nationality-law comparison, tax exposure, military obligation, renunciation traps — filed from Bangkok with embassy coordination.
Quick Answer
Thailand permits dual citizenship · foreign jurisdictions split 3 ways · Consult THB 8,500 · Full-service THB 55,000–185,000.
Choose a country
United States
ALLOWEDAllowed — the US does not require renunciation of prior nationality, and Thai law permits retention post-naturalization.
United Kingdom
ALLOWEDFully allowed — the UK imposes no renunciation and Thailand permits retention.
Australia
ALLOWEDAllowed since 2002 (Australian Citizenship Act amendment) · Thailand recognises retention.
Germany
ALLOWEDNow allowed! (StAG reform effective 27-Jun-2024) — no more renunciation of prior nationality.
Japan
RESTRICTEDNot allowed — Nationality Law Art. 14–16 requires choosing one nationality before age 22 (pre-2022 was 20).
China (PRC)
RESTRICTEDStrictly prohibited — Nationality Law Art. 3, 8, 9 · acquiring foreign nationality = automatic loss of PRC nationality.
India
CONDITIONALNot allowed — but OCI (Overseas Citizen of India) card offers quasi-citizenship rights.
South Korea
CONDITIONALConditional — Multiple Citizenship Act 2011: foreign naturalisers must sign 'Non-Exercise of Foreign Nationality' pledge.
France
ALLOWEDFully allowed — no restriction since Code Civil 1973 reform.
Singapore
RESTRICTEDNot allowed — Constitution Art. 134 · Citizenship Act · adults acquiring foreign nationality must renounce Singapore.
FAQ
- Does Thailand allow dual citizenship?
- Yes — the Nationality Act B.E. 2508 (amended 2551) does not require renunciation of prior nationality when acquiring Thai, nor does it revoke Thai when a Thai acquires foreign nationality (except for elected MPs, governors, ministers).
- Which countries allow dual with Thailand?
- Fully allowed: USA, UK, Australia, Canada, France, Germany (since 2024), New Zealand, Sweden · Not allowed: China, Singapore, Japan (adults), Netherlands (partial) · Conditional: India (OCI), South Korea.
- Consultation fees?
- Single country 8,500 THB (2-hour video + 15-page memo) · Full-service (document filing + translation + embassy liaison across two jurisdictions) 55,000–185,000 THB depending on complexity.
- Double taxation risk?
- Depends on tax treaty — Thailand has DTAs with 61 countries · USA is unique in taxing citizens worldwide regardless of residence · Most countries residence-based (>183 days).
- Children of mixed nationality — must they choose?
- Thailand does not force choice · Japan mandates by age 22 · Korea by 22 (males 18 if avoiding conscription) · Singapore by 22 (males 21 if avoiding National Service).
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