What Is Form N-600 Used For? Eligibility, Proof, and Filing

Form N-600 is used to apply for a Certificate of Citizenship, a permanent document from U.S. Citizenship and Immigration Services (USCIS) that proves you are already a U.S. citizen. The form does not grant citizenship. It confirms citizenship you obtained automatically, either at birth abroad to a U.S. citizen parent or during childhood when a parent naturalized. There is no deadline to file, and the current filing fee is $1,170.¹

What the Certificate Actually Proves

A Certificate of Citizenship is a permanent record that never expires. That is what sets it apart from a U.S. passport, which also proves citizenship but has to be renewed every ten years. The certificate is entered into the Department of Homeland Security’s permanent files, so your status can be verified for federal benefits, employment, and legal matters without depending on a document that lapses.²

If you were born abroad to a U.S. citizen parent, you may already have a Consular Report of Birth Abroad (CRBA, Form FS-240) issued by the State Department when your birth was reported at a U.S. embassy or consulate. Both the CRBA and the Certificate of Citizenship prove U.S. citizenship, but they come from different agencies and different processes. The CRBA is issued by the State Department overseas; the Certificate of Citizenship is issued by USCIS, generally from within the United States.³ Filing an N-600 when you already hold a CRBA gives you a second, independent government record of your status.

Who Should File Form N-600

The N-600 is for people who already became citizens automatically. If you are applying to become a citizen through naturalization, that is Form N-400, not N-600. There are two paths that make you eligible for the N-600, and USCIS evaluates them differently.¹

Citizenship Acquired at Birth

If you were born outside the United States to at least one U.S. citizen parent, you may have become a citizen at the moment of birth. The core condition is that your citizen parent lived in the United States for a set number of years before you were born. For births on or after November 14, 1986, the citizen parent must have been physically present in the United States for at least five years total, with at least two of those after age 14.⁴ For births before that date, the rule is ten years, with five after age 14.⁵

Time a parent spent abroad in U.S. military service or federal government employment can count toward the physical presence requirement. Ordinary time living abroad does not.

Citizenship Derived During Childhood

A child born abroad who did not acquire citizenship at birth can still become a citizen automatically if all of the following happen before the child turns 18: at least one parent is a U.S. citizen, the child is a lawful permanent resident, and the child is living in the United States in the legal and physical custody of the citizen parent.⁶ Citizenship takes effect by operation of law once the final condition is met. No ceremony, no approval. The N-600 documents what has already happened.

These derivation rules also apply to adopted children of U.S. citizens, provided the adoption qualifies as a parent-child relationship under immigration law.⁶ Adopted applicants must submit a certified copy of the full and final adoption decree.⁷

When the N-600 Is Not the Right Form

If the applicant is under 18, lives outside the United States, and did not acquire citizenship at birth, the right form is usually the N-600K, not the N-600. The N-600K falls under a different section of immigration law and looks at the physical presence of the U.S. citizen parent or, in some cases, grandparent. Once the child turns 18, the N-600K is no longer available.¹

What You Have to Prove

The evidence in an N-600 case builds a chain: your parent was a citizen, your parent met the physical presence or residency requirement, and you have a legally recognized relationship to that parent. Every link needs support.

At minimum, plan to submit your birth certificate showing both parents, each parent’s birth certificate or naturalization certificate, and your parents’ marriage certificate if they were married. If your case is based on derivation, add proof of your lawful permanent resident status, such as a green card or an I-551 stamp.⁷

The hardest piece is usually parental physical presence. You have to show your citizen parent actually lived in the United States for the required years before your birth. School transcripts, employment records, tax returns, leases, and medical records all help place a parent in the country during a given period. More years to cover means more documentation. Cases fall apart when applicants assume a parent’s presence is obvious and submit little proof.⁴

Filing and Fees

You can file Form N-600 online through a USCIS account or by mail. Online filing lets you pay, upload photos, track your case, and respond to evidence requests digitally. Online filing is not available if you are applying from outside the United States, requesting a fee waiver, or filing as a military member or veteran claiming the fee exemption. Those cases must be filed on paper.⁸

The filing fee is $1,170.¹ Current members and veterans of any branch of the U.S. Armed Forces filing on their own behalf pay no fee, but they must attach proof of service. This exemption does not extend to children of service members, who pay the standard fee. Applicants who cannot afford the fee and are not covered by the military exemption can request a waiver on Form I-912 by showing receipt of means-tested public benefits, household income at or below 150% of the Federal Poverty Guidelines, or other documented hardship.

What Happens After You File

USCIS issues a receipt notice with a case number once your application and fee are received. Median processing time has recently been around three months, though this shifts by field office and workload.

Applicants in the United States are scheduled at a local Application Support Center for a photograph. Applicants abroad submit two passport-style photos with the application.⁸

USCIS may schedule an in-person interview to review your originals and ask questions about gaps or inconsistencies. Not every case gets one, but expect an interview if the physical presence evidence is thin or the family relationships are complicated.

Approved applicants 14 and older take the Oath of Allegiance before receiving the certificate. If the oath is not administered at the interview, USCIS schedules a separate ceremony. Applicants under 14 are generally not required to take the oath.⁹

Why the First Filing Matters

A denied N-600 comes with an unusual consequence. Once the appeal window closes, you cannot file a new N-600 for the same claim. USCIS will reject it. That makes the N-600 different from most immigration forms, where reapplying stays open.⁹

If you receive a denial, you have 30 days from the date of the decision to file an appeal on Form I-290B. Because USCIS mails the decision, you effectively get 33 days from the decision date. There is no extension.¹⁰ Miss that window and your only remaining option is a motion to reopen or reconsider, also on Form I-290B, which requires new facts or an argument that the original decision was legally wrong.

Because of the one-shot rule, gather the parental physical presence documentation before you file, even if that takes months. A rushed application that cannot be refiled is worse than a slow one that is complete.

1
U.S. Citizenship and Immigration Services (USCIS). Form N-600, Instructions for Application for Certificate of Citizenship
2
U.S. Citizenship and Immigration Services (USCIS). Chapter 2 – Certificate of Citizenship
3
U.S. Citizenship and Immigration Services (USCIS). U.S. Citizenship at Birth for Children of U.S. Citizens Born Outside the U.S.
4
U.S. Citizenship and Immigration Services (USCIS). Chapter 3 – U.S. Citizens at Birth (INA 301 and 309)
5
Department of State Foreign Affairs Manual. 8 FAM 301.7 Immigration and Nationality Act of 1952
6
Office of the Law Revision Counsel. 8 USC 1431 – Children Born Outside the United States and Lawfully Admitted for Permanent Residence
7
U.S. Department of State. Obtaining U.S. Citizenship Under the Child Citizenship Act
8
U.S. Citizenship and Immigration Services (USCIS). N-600, Application for Certificate of Citizenship
9
U.S. Citizenship and Immigration Services (USCIS). N-600, Application for Certificate of Citizenship Frequently Asked Questions
10
U.S. Citizenship and Immigration Services (USCIS). Questions and Answers – Appeals and Motions