What Is Form N-600?
Form N-600, Application for Certificate of Citizenship, is the form you file with USCIS to obtain official proof that you are a U.S. citizen through derivation or acquisition. It does not make you a citizen — if you qualify, you are already a citizen by operation of law. The N-600 simply provides the documentation to prove it.
A Certificate of Citizenship is an official government document that serves as evidence of U.S. citizenship. It is issued by USCIS and is accepted as proof of citizenship for all purposes, including applying for a U.S. passport, obtaining government benefits, and employment verification.
There are two main ways a person can become a citizen without going through the naturalization process: derived citizenship (becoming a citizen automatically after birth, typically when a parent naturalizes) and acquired citizenship (being a citizen at birth because of the citizenship status of one or both parents, even when born abroad).
Derived Citizenship: The Child Citizenship Act
The Child Citizenship Act of 2000 (CCA), which took effect on February 27, 2001, provides the primary framework for derived citizenship. Under the CCA, a child born outside the United States automatically becomes a U.S. citizen when all of the following conditions are met: at least one parent is a U.S. citizen (by birth or naturalization), the child is under 18 years of age, the child is a lawful permanent resident (green card holder), and the child is residing in the United States in the legal and physical custody of the U.S. citizen parent.
If all four conditions are satisfied simultaneously, citizenship is automatic — no application is required. However, the N-600 provides the official documentation. Children who turned 18 before February 27, 2001, are not covered by the CCA and must qualify under the prior law (former INA Section 321, which had different requirements).
Before the CCA: Former INA Section 321
For individuals who turned 18 before February 27, 2001, the old rules under former Section 321 of the INA apply. Under that provision, a child derived citizenship if both parents naturalized before the child turned 18 (or the surviving parent, if one parent was deceased, or the parent with legal custody after a legal separation). The requirements were stricter, and many people who would qualify under the CCA did not qualify under the old law. The applicable law depends on whether the child was under 18 on the CCA's effective date.
Acquired Citizenship: Born Abroad to a U.S. Citizen Parent
A person born outside the United States may be a U.S. citizen at birth (acquired citizenship) if one or both parents were U.S. citizens at the time of birth and the citizen parent(s) met certain physical presence requirements in the United States before the child's birth. The specific requirements depend on when the child was born and whether one or both parents were citizens.
Both Parents Are U.S. Citizens
If both parents were U.S. citizens at the time of the child's birth abroad, at least one parent must have had a residence in the United States or its outlying possessions at some point before the birth. There is no minimum duration requirement — any period of residence suffices.
One Parent Is a U.S. Citizen, One Is Not
If only one parent was a U.S. citizen at the time of birth, the citizen parent must have been physically present in the United States for a certain number of years before the child's birth. The exact requirement depends on the child's date of birth:
| Child's Date of Birth | Physical Presence Required of Citizen Parent |
|---|---|
| On or after November 14, 1986 | 5 years in the U.S., at least 2 of which were after age 14 |
| Between December 24, 1952 and November 13, 1986 | 10 years in the U.S., at least 5 of which were after age 14 |
| Before December 24, 1952 | Various rules depending on specific date and circumstances |
These requirements have been the subject of significant litigation, particularly regarding gender-based distinctions between citizen fathers and citizen mothers. The rules for children born out of wedlock are different and depend on whether the citizen parent is the mother or the father.
How to File Form N-600
Step 1: Determine eligibility. Before filing, carefully analyze which provision of law applies to your situation. The rules depend on your date of birth, your parents' citizenship status, their marital status, and their physical presence in the United States. This analysis can be complex — consider consulting an attorney.
Step 2: Complete Form N-600. Download the latest version from uscis.gov/n-600. Complete all applicable sections. If filing on behalf of a child under 18, the U.S. citizen parent files the application.
Step 3: Gather supporting documents. Required evidence typically includes your birth certificate (with certified English translation if not in English), your parents' birth certificates or naturalization certificates, your parents' marriage certificate, evidence of physical presence in the U.S. (tax returns, school records, employment records), your green card (if claiming derived citizenship), and your parents' green card or naturalization certificate showing they were citizens before you turned 18.
Step 4: File with USCIS. Mail the completed N-600 with supporting documents and the filing fee to the USCIS lockbox. Check uscis.gov for the current filing fee. The fee is waived for members and veterans of the U.S. armed forces.
Step 5: Attend interview (if required). USCIS may schedule an interview at your local field office. Not all N-600 cases require an interview — some are approved based on the documentary evidence alone. If an interview is scheduled, bring originals of all documents previously submitted as copies.
N-600 vs. U.S. Passport Application
If you believe you are a U.S. citizen through derivation or acquisition, you have two options for obtaining proof: file Form N-600 with USCIS for a Certificate of Citizenship, or apply for a U.S. passport with the Department of State. Both are valid proof of citizenship.
| Feature | N-600 (Certificate) | U.S. Passport |
|---|---|---|
| Issuing agency | USCIS | State Department |
| Processing time | Several months to over a year | Typically 6-8 weeks (routine) |
| Cost | Check uscis.gov for current fee | Check travel.state.gov for current fee |
| Proof of citizenship | Yes — comprehensive document | Yes — widely recognized |
| Travel document | No | Yes |
| Expiration | Does not expire | Expires (10 years for adults) |
Many immigration attorneys recommend applying for a passport first because it is faster and less expensive. If the State Department approves the passport, you have proof of citizenship. If they deny it, you can then file N-600 with USCIS, which conducts its own independent analysis.
Common Complications
N-600 cases can become complicated when parents divorced or separated and custody records are unclear, the U.S. citizen parent cannot prove physical presence in the United States (especially for older cases where records are scarce), the child was born out of wedlock and the father is the U.S. citizen (additional legitimation requirements apply), the applicable law is ambiguous because of the child's specific date of birth, or the child aged out (turned 18) before all conditions for derived citizenship were met.
If your case involves any of these complications, consult with an immigration attorney before filing. A denied N-600 can be appealed to the USCIS Administrative Appeals Office (AAO), but it is better to build the strongest possible case from the start.
Frequently Asked Questions
What is the difference between derived and acquired citizenship?
Derived citizenship is obtained automatically when a child meets certain conditions after birth, typically when a parent naturalizes while the child is a permanent resident under 18. Acquired citizenship is obtained at birth when a child is born abroad to at least one U.S. citizen parent who meets physical presence requirements.
Do I need to file N-600 to become a citizen?
No. If you qualify for derived or acquired citizenship, you are already a U.S. citizen by operation of law. The N-600 does not grant citizenship — it is an application for documentary proof (a Certificate of Citizenship) that you are already a citizen.
How long does N-600 processing take?
Processing times vary by USCIS field office and can range from several months to over a year. Check uscis.gov for current processing times at the office handling your case.
Can I use a U.S. passport instead of filing N-600?
Yes. If you can prove your citizenship claim to the State Department, you may apply for a U.S. passport, which also serves as proof of citizenship. Some people find the passport application faster and less expensive than N-600. However, a Certificate of Citizenship is a more comprehensive proof document.
What if my parents were not married when I was born?
The rules for citizenship transmission differ for children born out of wedlock. If the U.S. citizen parent is the mother, the requirements are generally less strict. If the U.S. citizen parent is the father, legitimation or acknowledgment of paternity is typically required, along with other conditions that vary based on the date of birth. Consult an immigration attorney for cases involving unmarried parents.
Important: Citizenship law is one of the most complex areas of immigration law. The rules that apply to your case depend on your specific date of birth, your parents' citizenship status, their marital status, and other factors. If there is any doubt, consult a licensed immigration attorney before filing.
Last verified: April 2026 · Reviewed by USImmigrationLaw.Today editorial team.