U.S. Naturalization Process: Form N-400, Interview, and Oath

The naturalization process for green card holders takes most lawful permanent residents through the same seven steps: confirm you meet the residency and character requirements, file Form N-400 with the fee, attend a biometrics appointment, pass an interview with English and civics tests, receive a decision, and take the Oath of Allegiance at a ceremony. You can apply after five years as a permanent resident, or three years if you are married to and living with a U.S. citizen.¹

When You Can Apply

The clock starts the day you became a lawful permanent resident. Five years later, you can file Form N-400. Inside that five-year window, you must also have been physically present in the country for at least 30 months total.²

If you are married to a U.S. citizen and living together, the timeline drops to three years of continuous residence and 18 months of physical presence. Your spouse must have held citizenship for that entire three years, and the marriage must be intact throughout.³

You do not have to wait for the exact anniversary. USCIS accepts applications filed up to 90 days before you first meet the continuous residence requirement, calculated by counting 90 days back from the day before you would have first met it.⁴

Eligibility Checks That Trip People Up

Trips Outside the United States

Continuous residence does not mean you can never leave, but long trips create problems. A single absence of more than six months but less than one year raises a presumption that you broke continuous residence. You can rebut it with evidence you kept ties here, but the burden sits with you.⁵ An absence of one year or more generally breaks continuous residence outright, and you may have to restart the clock.

If your work sends you abroad for a qualifying employer such as the U.S. government, a recognized American research institution, or certain private-sector or religious organizations, Form N-470 lets you preserve continuous residence. You must already have lived in the U.S. continuously for at least one year after getting your green card before this form is available.⁶

Good Moral Character

You must show good moral character during the three or five years before you file. Some offenses create a permanent bar no matter how old they are: murder, any aggravated felony conviction on or after November 29, 1990, and participation in persecution, genocide, torture, or extrajudicial killings.⁷

Lesser issues are weighed under a totality-of-circumstances review. Tax compliance is a factor USCIS treats seriously. If you owe back taxes, the standard the agency looks for is full payment of what you owe; an active installment plan alone may not be enough. Clearing tax debt before filing puts you in a stronger position.⁸

Selective Service

Male applicants between 18 and 31 must have registered with Selective Service. If you were required to register and did not, USCIS looks at whether the failure was knowing and willful. Applicants between 26 and 31 who never registered can still be approved if they show by a preponderance of the evidence that the failure was not intentional. After 31, the failure falls outside the statutory period and no longer blocks approval.⁹

Military Service

Members of the U.S. Armed Forces who have served honorably for at least one year can bypass both the residency and physical presence requirements. You must file while still serving or within six months of an honorable discharge. There is no filing fee and no certificate fee for military applicants.¹⁰ If you are later separated under other-than-honorable conditions before completing five years of service, the citizenship can be revoked.

Filing Form N-400

Form N-400 is available on the USCIS website and can be filed online through a USCIS account or mailed on paper to the lockbox for your state. The fee is $710 online or $760 by paper, and that covers the background check.¹¹

The form asks for a full picture of your life over the statutory period: every address you have lived at, a complete employment history with employer names and dates, and the dates and length of every trip abroad. You will need to submit a copy of both sides of your Permanent Resident Card and IRS tax return transcripts covering the period. If you are filing based on marriage, add your marriage certificate and proof of your spouse’s citizenship.¹¹

Names have to match your legal documents exactly, middle names and suffixes included. Mismatches between your green card, birth certificate, and application are one of the most common causes of delay. Gather your documents first, then fill out the form.

Fee Waivers and Reduced Fees

Two forms of financial help are available. Form I-912 asks for a full waiver if your household income is at or below 150% of the federal poverty guidelines; for 2026, that is $23,940 for a single person or $49,500 for a family of four in the 48 contiguous states, with higher thresholds in Alaska and Hawaii.¹² Form I-942 requests a reduced fee if your household income is between 150% and 200% of the guidelines; the reduced N-400 fee is $320, plus the $85 biometrics fee.¹³

After You File

USCIS issues a receipt notice (Form I-797C) with a tracking number you can use to check your case online. That receipt has a useful side effect: it automatically extends your green card for 24 months from the “Card Expires” date on the card, so you generally do not need to file Form I-90 while naturalization is pending.¹⁴

Biometrics and the Interview

USCIS schedules a biometrics appointment at a local Application Support Center after your application is accepted. Technicians take your fingerprints, photograph, and digital signature for the background check. N-400 applicants cannot reuse biometrics from earlier filings.¹⁵

At the interview, an immigration officer reviews your N-400 with you, going through your answers to confirm they are still accurate, and asks about your travel, employment, and background. The English and civics tests happen during this same appointment.

The English test has three parts. Speaking is assessed through the interview conversation itself. Reading requires you to read one of three sentences correctly aloud. Writing requires you to write one of three sentences correctly. The civics test is oral: the officer asks up to 10 questions from a list of 100, and you need at least 6 correct to pass.¹⁶

Test Exemptions

Federal law exempts some applicants from the English requirement:

50/20 rule: age 50 or older with at least 20 years as a permanent resident.
55/15 rule: age 55 or older with at least 15 years as a permanent resident.

Those who qualify still take the civics test, but can take it in their native language through an interpreter.¹⁷ A separate 65/20 rule lets applicants who are 65 or older with 20 years of permanent residence study only 20 of the 100 civics questions.¹⁸

If a physical or developmental disability or mental impairment prevents you from meeting the English or civics requirements, Form N-648 lets a licensed medical professional certify the disability after an in-person evaluation (or telehealth where state law allows). There is no filing fee for the form, though the medical exam itself may cost something.¹⁹

If You Fail the Test or Get Denied

Failing on the first try is not the end. USCIS reschedules a re-examination between 60 and 90 days later, and you are only retested on the sections you failed. Fail the second time and the application is denied.¹⁷ You can file a new N-400 after that, but you owe the fee again.

Any denial notice will spell out the specific grounds.²⁰ If you think the decision was wrong, Form N-336 asks for a hearing before a different immigration officer, and it must be filed within 30 calendar days of receiving the decision (33 days if it was mailed). Miss that deadline and USCIS generally rejects the filing without refunding the fee.²¹

One situation stops the process entirely: if removal proceedings are pending against you, USCIS cannot adjudicate the naturalization application and will deny it.²⁰

The Oath Ceremony

Approval brings Form N-445, the Notice of Naturalization Oath Ceremony, with a date and location. Sometimes the oath is administered the same day as the interview; otherwise you attend a scheduled ceremony. You must bring your Permanent Resident Card and turn it in at check-in. That requirement is waived only if you previously reported the card lost and tried to recover it, or if military service meant you were never issued one.²²

Taking the Oath of Allegiance is the moment you become a citizen. You renounce allegiance to foreign governments, pledge to support and defend the Constitution, and accept obligations that include bearing arms or performing noncombatant service when required by law. You receive your Certificate of Naturalization at the ceremony, and that certificate is what you use to apply for a U.S. passport.²²

If you have children under 18 who are lawful permanent residents living in your legal and physical custody, they generally acquire citizenship automatically the day you naturalize, without filing their own applications. You may still want to obtain a Certificate of Citizenship for them by filing Form N-600 as proof.²³

1
Office of the Law Revision Counsel. 8 USC 1427 – Requirements of Naturalization
2
U.S. Citizenship and Immigration Services. USCIS Policy Manual – Physical Presence
3
Office of the Law Revision Counsel. 8 USC 1430 – Married Persons and Employees of Certain Nonprofit Organizations
4
U.S. Citizenship and Immigration Services. USCIS Policy Manual – Jurisdiction, Place of Residence, and Early Filing
5
U.S. Citizenship and Immigration Services. Continuous Residence and Physical Presence Requirements for Naturalization
6
U.S. Citizenship and Immigration Services. Instructions for Application to Preserve Residence for Naturalization Purposes – Form N-470
7
U.S. Citizenship and Immigration Services. USCIS Policy Manual – Permanent Bars to Good Moral Character
8
U.S. Citizenship and Immigration Services. Restoring a Rigorous, Holistic, and Comprehensive Good Moral Character Evaluation Standard for Aliens Applying for Naturalization
9
U.S. Citizenship and Immigration Services. USCIS Policy Manual – Attachment to the Constitution
10
Office of the Law Revision Counsel. 8 USC 1439 – Naturalization Through Service in the Armed Forces
11
U.S. Citizenship and Immigration Services. N-400, Application for Naturalization
12
U.S. Citizenship and Immigration Services. Poverty Guidelines
13
U.S. Citizenship and Immigration Services. I-942, Request for Reduced Fee
14
U.S. Citizenship and Immigration Services. Extension of Permanent Resident Card for Naturalization Applicants
15
U.S. Citizenship and Immigration Services. Photograph Reuse for Identity Documents – Policy Alert
16
U.S. Citizenship and Immigration Services. The Naturalization Interview and Test
17
U.S. Citizenship and Immigration Services. USCIS Policy Manual – English and Civics Testing
18
U.S. Citizenship and Immigration Services. Civics Questions for the 65/20 Exemption
19
U.S. Citizenship and Immigration Services. N-648, Medical Certification for Disability Exceptions
20
U.S. Citizenship and Immigration Services. USCIS Policy Manual – Results of the Naturalization Examination
21
U.S. Citizenship and Immigration Services. N-336, Request for a Hearing on a Decision in Naturalization Proceedings Under Section 336 of the INA
22
U.S. Citizenship and Immigration Services. Naturalization Ceremonies
23
Office of the Law Revision Counsel. 8 USC 1431 – Children Born Outside the United States and Lawfully Admitted for Permanent Residence