Requirements and Process for Naturalization of Philippine Citizenship

Naturalization is the statutory process by which an alien acquires Philippine citizenship. It is a privilege, not a right, and is granted only upon strict compliance with the qualifications and procedures prescribed by law. The 1987 Constitution of the Republic of the Philippines recognizes naturalization as one of the modes of acquiring citizenship. Article IV, Section 1(4) expressly includes among citizens of the Philippines “those who are naturalized in accordance with law.”

The primary statute is Commonwealth Act No. 473 (1939), otherwise known as the Revised Naturalization Law, as amended. This law establishes the judicial naturalization procedure. It is supplemented by Republic Act No. 9139 (2001), the Administrative Naturalization Law of 2001, which provides a simplified administrative route for a limited class of applicants. Other related laws, including Republic Act No. 530 and Republic Act No. 9225 (the Citizenship Retention and Re-acquisition Act of 2003), affect specific aspects of citizenship but do not replace the core naturalization framework.

Qualifications for Judicial Naturalization

Under Section 2 of Commonwealth Act No. 473, an applicant for judicial naturalization must possess all of the following qualifications:

Age — The applicant must be at least twenty-one (21) years of age on the date of the hearing of the petition.
Continuous Residence — The applicant must have resided continuously in the Philippines for not less than ten (10) years immediately preceding the filing of the petition.
The ten-year period is reduced to five (5) years in any of the following cases:
- The applicant was born in the Philippines;
- The applicant is married to a citizen of the Philippines;
- The applicant has been honorably discharged from the Armed Forces of the Philippines after serving for not less than two (2) years;
- The applicant has introduced a useful invention, established a new industry, opened a new field of commerce or industry, or rendered distinguished civil or military service to the Philippines;
- The applicant is engaged in a lawful trade, business, or profession beneficial to the country and from which a sufficient income is derived.
  Continuity of residence is strictly construed. Temporary absences are permitted only if the applicant demonstrates an intent to return and maintain Philippine domicile. Prolonged or unexplained absences break continuity.
Good Moral Character and Belief in Constitutional Principles — The applicant must be of good moral character and must believe in the principles underlying the Philippine Constitution. This requirement encompasses loyalty to the democratic form of government and the rule of law.
Known Trade, Business, Profession, or Lawful Occupation — The applicant must have a legitimate source of income sufficient to support himself and his family. The occupation must be lawful and, in cases where the reduced five-year period is claimed, beneficial to the Philippines.
Language Proficiency — The applicant must be able to speak and write English, Spanish, or any of the principal Philippine languages (Filipino, Cebuano, Ilocano, Hiligaynon, Waray, etc.).
Enrollment of Minor Children in Philippine Schools — The applicant must have enrolled all his minor children of school age in public or private schools recognized by the Department of Education throughout the entire period of residence required prior to the hearing. Philippine history, government, and civics must form part of the curriculum in those schools.

All qualifications must exist at the time of the hearing and must be proven by competent evidence.

Disqualifications

Section 4 of Commonwealth Act No. 473, as amended, enumerates absolute disqualifications. An applicant is barred from naturalization if he:

Is opposed to organized government or is a member of or affiliated with any association or group opposed to organized government;
Defends or teaches the necessity or propriety of violence, personal assault, or assassination for the success or predominance of his ideas;
Has been convicted of a crime involving moral turpitude;
Is suffering from mental alienation or from any incurable contagious disease;
Has not complied with the military training requirements under existing laws during his residence in the Philippines (subject to current applicable statutes);
Is a citizen or subject of a country with which the Philippines is at war (during the continuance of such war);
Has been convicted of espionage or any crime against national security;
Is a polygamist or believes in the practice of polygamy;
Has been, during his residence in the Philippines, a member of or affiliated with any organization advocating the overthrow of the Philippine Government by force or violence.

The presence of any single disqualification is sufficient to deny the petition.

Procedure for Judicial Naturalization

Judicial naturalization is a special proceeding conducted in the Regional Trial Court. The process is adversarial and requires strict proof.

Step 1: Filing of the Verified Petition
The petition is filed in the Regional Trial Court of the province or city where the applicant has resided for at least one year immediately preceding the filing. It must be verified and contain:

Full name, present and former residences, date and place of birth, civil status, names and ages of spouse and children;
Occupation and approximate annual income;
A positive declaration that the applicant possesses every qualification and suffers from no disqualification;
A prayer for the grant of Philippine citizenship.

Supporting documents ordinarily include authenticated birth certificate, marriage certificate, birth certificates of children, immigration arrival certificate or equivalent, NBI and local police clearances, income tax returns or affidavits of income and assets, school records of minor children, and affidavits of at least two credible Filipino character witnesses. Foreign documents must be properly authenticated (Apostille or consular legalization).

Step 2: Publication and Posting
Upon filing, the court issues an order setting the hearing date and directing publication. The petition and order must be published once a week for three consecutive weeks in the Official Gazette and in a newspaper of general circulation in the province or city of residence. Copies must also be posted in the bulletin board of the city or municipal hall and in a conspicuous place in the courthouse. Publication costs are borne by the applicant and can be substantial.

Step 3: Government Investigation
The Office of the Solicitor General or its designated representative conducts a full investigation. This includes verification of documents, interviews with the applicant and witnesses, background checks for criminal or subversive records, and assessment of the applicant’s integration into Philippine society. The Government may file a formal opposition.

Step 4: Hearing
The hearing is held in open court. The applicant must appear personally and present testimonial and documentary evidence proving every qualification and the absence of every disqualification. The Government may cross-examine witnesses and introduce counter-evidence. Because naturalization is a privilege, the applicant bears a heavy burden of proof.

Step 5: Decision
If the court finds the applicant fully qualified, it renders a written decision granting the petition and ordering the taking of the oath of allegiance. The decision is appealable by the Government or any oppositor to the Court of Appeals and, ultimately, to the Supreme Court. The judgment does not become final and executory until the appeal period lapses or any appeal is resolved.

Step 6: Oath of Allegiance and Issuance of Certificate
Upon finality of the judgment, the applicant takes the oath of allegiance before the presiding judge or an authorized officer:
“I, [full name], do solemnly swear (or affirm) that I will support and defend the Constitution of the Republic of the Philippines and obey the laws, legal orders, and decrees promulgated by the duly constituted authorities of the Republic of the Philippines, and I hereby declare that I recognize and accept the supreme authority of the Government of the Republic of the Philippines and will maintain true faith and allegiance thereto; and that I impose this obligation upon myself voluntarily, without mental reservation or purpose of evasion.”

After the oath, the court issues the Certificate of Naturalization. The naturalized citizen must register the certificate with the Local Civil Registry Office and the Bureau of Immigration for updating of civil and immigration records.

Administrative Naturalization under Republic Act No. 9139

RA 9139 provides a faster, less expensive administrative procedure limited to aliens born in the Philippines who have continuously resided in the country since birth.

Qualifications include: birth in the Philippines and continuous residence since birth; good moral character and belief in the Constitution; no conviction for crimes involving moral turpitude or national security; completion of elementary and secondary education in Philippine schools; a known legitimate trade, business, or profession; payment of all taxes and government obligations; and no threat to national security.

Procedure:
An application is filed with the Special Committee on Naturalization (composed of the Secretary of Justice as chair, the Secretary of Foreign Affairs, and the Commissioner of Immigration). The Committee conducts an administrative investigation. If approved, the applicant takes the oath of allegiance before a Regional Trial Court judge or a Philippine consular officer. A Certificate of Naturalization is then issued. The effects are identical to those of judicial naturalization.

This route is unavailable to aliens who were not born in the Philippines or who have not resided continuously since birth.

Derivative or Family Effects

Naturalization of a parent confers Philippine citizenship upon minor children born in the Philippines who are residing in the country at the time of naturalization. Children born after the parent’s naturalization acquire citizenship by jus sanguinis if at least one parent is a Philippine citizen at the time of birth.

The spouse of a naturalized citizen does not acquire citizenship automatically. The spouse may file a separate petition. When the spouse is married to a Filipino citizen (including a naturalized citizen), the residency requirement is reduced to five years. Under Section 15 of CA 473, a woman married to a Philippine citizen may be naturalized after only one year of continuous residence immediately preceding the filing, provided she meets the other qualifications and is not disqualified.

Rights, Privileges, and Limitations

A naturalized citizen enjoys the same civil, political, and economic rights as a natural-born citizen, including the right to vote, own property, and engage in business. Naturalized citizens are, however, ineligible for offices and positions reserved by the Constitution exclusively for natural-born citizens. These include the offices of President and Vice-President, membership in the Senate and House of Representatives, and positions in the judiciary and constitutional commissions that require natural-born status.

Revocation of Naturalization

Under Section 18 of Commonwealth Act No. 473, the Certificate of Naturalization may be cancelled by the Regional Trial Court upon petition of the Solicitor General on any of the following grounds:

The naturalization was obtained by fraud, false statement, or concealment of a material fact;
Within five years after naturalization, the naturalized citizen returns to his country of origin or any foreign country and establishes permanent residence there (such return constitutes prima facie evidence of lack of intention to remain a permanent resident of the Philippines);
The naturalized citizen is convicted, within five years after naturalization, of a crime involving moral turpitude or an offense against Philippine law;
The naturalized citizen becomes a member of or affiliated with any organization advocating the overthrow of the Philippine Government by force or violence;
The naturalized citizen fails to comply with the requirement to enroll minor children in Philippine schools;
The naturalized citizen has, by his subsequent conduct, demonstrated lack of attachment to the Constitution or laws of the Philippines or lack of good faith in becoming a Philippine citizen.

Cancellation proceedings afford due process. Upon cancellation, the person reverts to alien status and may be subject to deportation if no other lawful basis to remain exists.

Dual Citizenship and Related Matters

Republic Act No. 9225 expressly recognizes dual citizenship for former natural-born Filipinos who reacquire citizenship by taking the oath of allegiance. For persons acquiring citizenship through naturalization, the oath of allegiance binds the individual to the Philippines. Retention or acquisition of another citizenship is governed by the laws of the other country. Philippine law does not automatically divest a naturalized citizen of prior citizenship, but the naturalized citizen must comply with all Philippine obligations of citizenship.

Naturalization proceedings are strictly construed by Philippine courts. Substantial compliance is insufficient; every statutory requirement must be satisfied by clear and competent evidence. The entire process—from filing to final certificate—commonly spans several months to several years, depending on court dockets, publication requirements, and the presence or absence of opposition. All foreign documents must be properly authenticated, and applicants must maintain continuous qualifying residence and good moral character throughout the proceedings.