Singapore

Last Updated: 2026-03-31

Official Portal: Immigration & Checkpoints Authority (ICA)

Embassy Finder: Singapore Diplomatic Missions

Quick Facts

Category	Details
Residency for naturalization	Minimum 2 years as a Permanent Resident (PR); PR itself requires several years of prior residence or qualifying criteria
Language requirement	No formal language examination, but interviews are conducted in English
Civics test	No formal civics test; the ICA conducts an interview and assessment
Processing time	6—12 months for citizenship application (after obtaining PR status)
Naturalization fee	SGD 100 (application); SGD 70 (citizenship certificate)
Dual citizenship	Not permitted — strictly enforced
Citizenship by birth in Singapore	Conditional; at least one parent must be a Singapore citizen at the time of birth
Citizenship by descent	Yes, for children born abroad to a Singaporean parent (registration required)
Governing law	Constitution of Singapore (Part X, Articles 120—128) and the Singapore Citizenship Regulations

Dual Citizenship — Not Permitted

Singapore maintains one of the world’s strictest prohibitions on dual citizenship. The government has repeatedly and explicitly stated that it will not allow dual citizenship under any circumstances.

Key rules:

A Singapore citizen who voluntarily acquires the citizenship of another country automatically loses Singapore citizenship.
A person who applies for Singapore citizenship must renounce all other nationalities before the citizenship certificate is issued.
Male citizens and second-generation PRs are subject to National Service (NS) — compulsory military service of approximately 2 years. Attempting to avoid NS by relying on a second citizenship is a criminal offense under the Enlistment Act.
Singapore does not recognize the foreign citizenship of its own citizens. If a Singaporean obtains a foreign passport and travels on it, they are still treated as a Singapore citizen for all purposes under Singapore law.

For children born with multiple citizenships: A child born to a Singaporean parent and a foreign parent may hold dual nationality temporarily. The child must renounce all other citizalities by age 22 (or within one year of receiving a foreign citizenship, if after age 18). Failure to renounce results in automatic loss of Singapore citizenship. Males must complete National Service before making this decision.

The Singapore government has articulated the policy rationale clearly: in a small city-state where all male citizens serve in the military, dual citizenship would create an unacceptable imbalance between those who bear the obligations of citizenship and those who maintain exit options.

Acquisition of Nationality

By Birth

A person born in Singapore becomes a citizen by birth only if at least one parent is a Singapore citizen at the time of birth. Birth on Singapore territory to two foreign parents does not confer citizenship.

Before 15 May 2004: Citizenship by descent was transmitted only through the father. Children born to Singaporean mothers and foreign fathers before this date were not automatically citizens (though legislative amendments have provided some retroactive relief).

By Descent (Birth Abroad)

A child born outside Singapore to a Singaporean parent may acquire citizenship by descent, provided:

The birth is registered at a Singapore overseas mission or with ICA within one year of birth (or within one year of the relevant commencement date for applicable legislative amendments).
At least one parent was a Singapore citizen at the time of birth.
For births before 15 May 2004, only the father’s citizenship was transmitted; amendments have since allowed registration for children of Singaporean mothers in certain cases.

Generational limit: Citizenship by descent can only be transmitted for one generation born abroad. If a person acquired citizenship by descent (born abroad), their children born abroad are not automatically entitled to Singapore citizenship. They must apply for citizenship by registration, which is discretionary.

By Adoption

There is no automatic acquisition of citizenship through adoption. An adopted child must apply for citizenship by registration through ICA. The adoptive parent must be a Singapore citizen.

By Marriage

Marriage to a Singapore citizen does not confer citizenship. A foreign spouse must first obtain Permanent Resident status and then apply for citizenship through the standard naturalization process. There is no expedited spousal pathway.

By Naturalization (Registration)

Requirement	Details
Permanent Residency	Must hold PR status for at least 2 years before applying
Total residence	Generally 6+ years of total residence in Singapore (including time as PR and prior work/study)
Age	At least 21 years old (or application by parent for minors)
Character	Good character; no criminal record
Economic contribution	Stable employment, tax contributions, and economic participation are heavily weighted
National Service	Male applicants between 18—40 must serve NS (approximately 2 years full-time, followed by reserve obligations)
Renunciation	Must renounce ALL other citizenships before the citizenship certificate is granted
Family ties	Having a Singaporean spouse, children in local schools, or family in Singapore strengthens the application
Fee	SGD 100 (application); SGD 70 (certificate)

The process is highly selective. Singapore rejects a significant portion of citizenship applications. The ICA does not publish approval rates, but anecdotal evidence suggests that professional qualifications, income level, integration into Singaporean society, and length of residence are decisive factors.

Loss and Renunciation

Voluntary Renunciation

A Singapore citizen may renounce citizenship by registering a declaration with ICA, provided they have acquired or are about to acquire the citizenship of another country. The renunciation is irrevocable.

National Service obligation: Male citizens who have not completed NS or NS reserve obligations may not be permitted to renounce citizenship until their obligations are fulfilled. Attempting to renounce or leave Singapore to avoid NS is a criminal offense.

Involuntary Loss

Acquisition of foreign citizenship: Automatic loss upon voluntarily obtaining another nationality (for citizens over 22; temporary dual nationality grace period applies for minors).
Deprivation: The government may deprive a person of citizenship obtained by registration or naturalization on grounds of fraud, disloyalty, disaffection, trading with the enemy, or criminal conviction (sentence of 12+ months) within 5 years of registration.
Failure to renounce by age 22: Persons holding dual nationality who fail to renounce their foreign citizenship by age 22 automatically lose Singapore citizenship.

Restoration of Nationality

A former Singapore citizen who renounced or lost citizenship may apply for restoration by registration with ICA. Restoration is not a right — it is entirely discretionary. The applicant must demonstrate strong ties to Singapore and meet all current citizenship requirements, including PR status.

In practice, restoration is rarely granted. The government’s position is that citizenship renunciation is a deliberate act with permanent consequences.

Stateless Persons and Foundlings

The Constitution of Singapore (Article 122) provides that a person born in Singapore who is not a citizen of any country is a citizen of Singapore by birth. This provision protects against statelessness for children born on Singaporean territory.

Singapore is not a party to the 1954 or 1961 statelessness conventions but provides domestic protections against statelessness through constitutional provisions.

Document Checklist

Sources

Constitution of the Republic of Singapore — Part X (Citizenship), Articles 120—128. https://sso.agc.gov.sg/Act/CONS1963
Immigration & Checkpoints Authority (ICA) — Citizenship application and requirements. https://www.ica.gov.sg/citizen/citizenship
Singapore Citizenship Regulations — Subsidiary legislation under the Constitution. https://sso.agc.gov.sg/
Ministry of Foreign Affairs — Overseas missions for citizenship by descent registration. https://www.mfa.gov.sg/
Ministry of Defence (MINDEF) — National Service obligations. https://www.mindef.gov.sg/
Henley Passport Index — Singapore passport ranking. https://www.henleypassportindex.com/

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