Quick Answer: Naturalized vs Derived Citizenship
A naturalized citizen generally becomes a U.S. citizen by applying through the naturalization process, most commonly by filing Form N-400 and taking the Oath of Allegiance after approval.
A derived citizen becomes a U.S. citizen automatically through a qualifying U.S. citizen parent when all requirements of the applicable law are met.
Under current INA 320, derivative citizenship generally must be acquired before age 18. Form N-600 can later be used to document citizenship already acquired; it does not create derivative citizenship.
The key difference is that naturalization is an application-based process, while derivative citizenship arises automatically by operation of law. Citizenship acquired at birth through a U.S. citizen parent is a separate category.
Not Sure Which Citizenship Form Applies?
ImmigrationDirect’s online software can help you check whether Form N-400 or Form N-600 may fit your situation based on the information you provide.
ImmigrationDirect is not USCIS. The eligibility check does not make a final citizenship determination; USCIS makes the final decision on eligibility and approval.
Naturalized vs Derived Citizenship: Key Differences
| Difference | Naturalized Citizen | Derived Citizen |
|---|---|---|
| How citizenship is acquired | Through the naturalization process | Automatically by operation of law |
| Typical situation | An eligible noncitizen applies to become a citizen | A qualifying child acquires citizenship through a U.S. citizen parent |
| Application to acquire citizenship | Usually Form N-400 for the common adult naturalization path | No application is required to acquire citizenship under INA 320 |
| Age | Form N-400 applicants are generally at least 18 | Current INA 320 requirements generally must be met before age 18 |
| U.S. citizen parent required | No | Yes |
| Interview and civics test | Generally part of naturalization, subject to exceptions | Not required to acquire derivative citizenship |
| When citizenship begins | Generally after taking the Oath of Allegiance | When all applicable statutory requirements are satisfied |
| Typical USCIS certificate | Certificate of Naturalization | Certificate of Citizenship, generally if requested through Form N-600 |
| U.S. passport | May serve as citizenship evidence | May also serve as citizenship evidence |
USCIS states that INA 320 conditions must be satisfied together before the child’s 18th birthday, while N-600 is used to obtain documentation of citizenship that was already acquired.
What Is a Naturalized Citizen?
A naturalized citizen is a person who became a U.S. citizen after birth through the naturalization process. For the most common adult path, an eligible lawful permanent resident files Form N-400, Application for Naturalization, with USCIS.
Eligibility depends on the applicant’s naturalization category. Common paths include five years as a lawful permanent resident, or three years as a lawful permanent resident for certain spouses of U.S. citizens who meet the applicable marriage and marital-union requirements.
Other requirements can include continuous residence, physical presence, good moral character, and English and civics testing, although exceptions and other naturalization categories may apply.
If USCIS approves the application, the applicant generally becomes a U.S. citizen after taking the Oath of Allegiance and receives a Certificate of Naturalization.
What Is a Derived Citizen?
A derived citizen is a person who automatically acquired U.S. citizenship after birth through a qualifying U.S. citizen parent under the citizenship law that applied to them.
Unlike naturalization, the person does not complete the Form N-400 process to become a citizen. Under current law, derivative citizenship generally occurs before age 18 when the applicable INA 320 requirements are satisfied.
For detailed eligibility, custody, historical rules, and proof requirements, see our Derivative Citizenship Guide.
How Do I Know If I Am a Naturalized or Derived Citizen?
The easiest starting point is to look at how and when you became a U.S. citizen.
| Your situation | Citizenship category that may apply |
|---|---|
| You personally applied for naturalization, USCIS approved Form N-400, and you took the Oath of Allegiance | Naturalized citizen |
| You automatically became a citizen through a qualifying U.S. citizen parent before age 18 | Derived citizen |
| You were already a U.S. citizen from the moment you were born, including certain people born abroad to U.S. citizen parents | Citizenship acquired at birth, not derivative citizenship after birth |
For a derivative citizenship claim, the dates are important because the law in effect when the qualifying conditions were satisfied determines which requirements apply. Under current INA 320, all applicable conditions generally must be met before age 18.
If your citizenship history involves a U.S. citizen parent, do not assume that Form N-400 is necessarily the correct next step. First determine whether you may already have acquired citizenship through that parent.
How Naturalization Works
Naturalization is an application-based process. For the common Form N-400 path, an applicant generally:
- Confirms eligibility and files Form N-400.
- Attends a biometrics appointment if USCIS requires one.
- Attends a naturalization interview.
- Completes the English and civics tests unless an exemption or waiver applies.
- Receives a USCIS decision and, if approved, takes the Oath of Allegiance.
A person generally does not become a naturalized U.S. citizen merely by filing Form N-400 or passing the interview. Citizenship generally begins after the applicant takes the Oath of Allegiance, and USCIS then issues the Certificate of Naturalization.
The civics test version depends on when Form N-400 was filed. Applicants who filed on or after October 20, 2025 take the 2025 Naturalization Civics Test. For current test requirements and preparation, see our Citizenship Test guide.
How Derived Citizenship Works Under INA 320
Under current INA 320, a child born outside the United States generally acquires U.S. citizenship automatically when all applicable conditions are satisfied at the same time before age 18.
The child generally must have at least one qualifying U.S. citizen parent, be a lawful permanent resident, and reside in the United States in the legal and physical custody of that parent.
The parent may be a U.S. citizen by birth or through naturalization. USCIS states that the conditions do not have to occur in a particular order, as long as they are all satisfied together before the child’s 18th birthday.
The child does not file Form N-400 to acquire this citizenship. If documentation is needed, Form N-600 may be used to request a Certificate of Citizenship showing citizenship already acquired.
Certain adopted children, military or government-employee families, and historical cases can involve different rules. See our Derivative Citizenship Guide for these situations.
How Is Each Type of Citizenship Documented?
A naturalized citizen generally receives a Certificate of Naturalization after completing the naturalization process and taking the Oath of Allegiance. A person who acquired or derived citizenship through a U.S. citizen parent may use Form N-600 to request a Certificate of Citizenship documenting citizenship already acquired.
These certificates document different paths to U.S. citizenship and are not interchangeable terms. For a detailed comparison of their purpose, eligibility, and use, see our Certificate of Citizenship vs Certificate of Naturalization guide.
What If the Citizenship Rules Applied Before February 27, 2001?
The current INA 320 rules took effect under the Child Citizenship Act on February 27, 2001. If a person had already turned 18 before that date, earlier derivative citizenship laws may control the claim.
Former INA 321 and older nationality laws can have different requirements involving parental naturalization, age, residence, parents’ marital status or legal separation, and legal custody. USCIS expanded its guidance on former INA 321 and custody issues in November 2024.
Because historical derivative-citizenship requirements vary by date and family circumstances, there is no single pre-2001 eligibility checklist. Review the USCIS nationality guidance or our Derivative Citizenship Guide to identify the law that may apply to your situation.
Naturalized vs Derived Citizenship FAQs
Are naturalized and derived citizens both U.S. citizens?
Yes. Both terms describe U.S. citizens, but they describe different ways citizenship was obtained. A naturalized citizen becomes a citizen through the naturalization process. A derived citizen automatically acquires citizenship through a qualifying U.S. citizen parent when the applicable statutory conditions are satisfied.
If my parent became a U.S. citizen after I turned 18, can I derive citizenship?
Under current INA 320, the applicable requirements must generally be satisfied before age 18. A parent’s naturalization after the child’s 18th birthday therefore does not create derivative citizenship under current INA 320. Historical cases can depend on the citizenship law that applied at the relevant time.
Is Form N-600 the same as Form N-400?
No. Form N-400 is generally used by an eligible person applying to become a naturalized U.S. citizen. Form N-600 is used to request a Certificate of Citizenship documenting citizenship that was already acquired at birth or automatically after birth under applicable citizenship law.
Can I already be a U.S. citizen without a Certificate of Citizenship?
Yes. A person who automatically acquired U.S. citizenship does not become a citizen because USCIS later issues a Certificate of Citizenship. Form N-600 can be used to obtain USCIS documentation of citizenship already acquired. USCIS also notes that a person is not required to obtain a Certificate merely for that citizenship to exist.
Not Sure Which Citizenship Form Applies?
ImmigrationDirect’s online software can help you check whether Form N-400 or Form N-600 may fit your situation and guide you through preparing the form that may fit your situation. The software provides step-by-step questions, helps organize required information, and checks responses for missing or inconsistent details before filing.
ImmigrationDirect is not USCIS. Eligibility checks are based on the information you provide; USCIS makes the final determination on eligibility and whether to approve an application.
