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

The U.S. naturalization process is how a lawful permanent resident becomes a U.S. citizen: you file Form N-400 with U.S. Citizenship and Immigration Services, attend a biometrics appointment, pass an interview that includes English and civics tests, and take the Oath of Allegiance at a public ceremony. Most applicants need five years as a green card holder before filing; spouses of U.S. citizens can apply after three.¹ Start to finish, the process moves in a fixed order, and each step has its own paperwork, standards, and ways to stumble.

Who Can Apply

You must be at least 18, hold a valid Permanent Resident Card, and have lived continuously in the United States as a permanent resident for at least five years immediately before filing.² Within that five years, you need to have been physically present in the country for at least 30 months, and you must have lived in the state or USCIS district where you file for at least three months before submitting. USCIS accepts applications filed up to 90 days before you complete the five-year period, though you’re not eligible for naturalization itself until the full residence period is finished.³

You also need to read, write, and speak basic English and demonstrate knowledge of U.S. history and government.⁴ Older long-term residents and applicants with qualifying disabilities may be exempt from parts of that requirement, discussed further below.

Spouses of U.S. citizens can file after three years of continuous residence rather than five, with an 18-month physical presence requirement. You must have lived in marital union with your citizen spouse for the full three years, and your spouse must have been a citizen throughout that time.⁵ If the marriage ends before you take the oath, eligibility under this provision is lost and you fall back to the five-year track.

How Travel Abroad Affects Your Timeline

Long absences can quietly undo years of residence. A trip of six months to one year creates a presumption that you broke your continuous residence, and you carry the burden of proving otherwise with evidence like a maintained job, home, and family ties.² An absence of one year or more breaks continuous residence automatically. When it does, the clock resets: you generally must wait four years and one day after returning to refile under the five-year rule, or two years and one day under the spousal rule.

If your work requires you to be abroad for more than a year, Form N-470 can preserve your continuous residence, provided you’ve already spent at least one uninterrupted year in the U.S. as a permanent resident and your overseas employer qualifies (the U.S. government, certain American companies, or recognized religious organizations).⁶ An approved N-470 preserves continuous residence but does not waive physical presence unless you work for the U.S. government.

Good Moral Character and Common Pitfalls

USCIS evaluates moral character during the statutory period, which is the three or five years before you file. An aggravated felony conviction on or after November 29, 1990 is a permanent bar with no exception.⁷ The immigration definition of that term is broader than the criminal one and reaches offenses like fraud exceeding $10,000, certain theft convictions carrying a sentence of at least one year, and drug trafficking.⁸ Unpaid child support, outstanding tax debts, and lying to USCIS during the process also undermine character findings.

Selective Service catches many male applicants off guard. If you were between 18 and 25 while living in the United States, you were required to register. A knowing and willful failure can bar naturalization. Men aged 26 to 31 who didn’t register may still be able to explain the failure; applicants over 31 are generally past the statutory period where the failure matters.⁹

Filling Out and Filing Form N-400

Form N-400 asks for a detailed history of your employment, residences, and international travel over the relevant three or five years. You can submit it online or on paper through the USCIS website.¹⁰ Travel is where applications most often go sideways. Every trip outside the country needs exact departure and return dates. Old passports help, and the U.S. Customs and Border Protection I-94 website lets you pull up to ten years of entry and exit records, though it isn’t an official legal record and should be cross-checked against your own documentation.¹¹

Everyone submits a copy of both sides of their green card. Spousal applicants also include a certified copy of the marriage certificate, proof of the spouse’s U.S. citizenship, and divorce decrees or death certificates from any prior marriages. Foreign-language documents need a certified English translation with the translator’s signed statement of competence and accuracy.

Fees

Online filing costs $710; paper filing costs $760, and both include biometrics.¹² If your household income is at or below 150% of the Federal Poverty Guidelines, you can request a full fee waiver on Form I-912. Between 150% and 400% of those guidelines, a reduced fee of $380 applies.¹³ Waiver and reduced-fee requests must be filed on paper.

Once USCIS accepts your application, you’ll receive Form I-797C, Notice of Action, with your case tracking number.¹⁴ Your online account will show status updates, estimated completion dates, and any requests for evidence.

The Biometrics Appointment

USCIS then schedules a biometrics appointment at a local Application Support Center. Bring the notice and a government-issued photo ID. The center collects your fingerprints, photograph, and digital signature, and the prints are run against federal databases for criminal and immigration history. Missing the appointment without rescheduling in advance can cause USCIS to treat your case as abandoned. Biometrics must be completed before the case moves to the interview stage.

The Interview and Tests

At a USCIS field office, an officer places you under oath and walks through your N-400 line by line. Anything that changed after you filed, whether new employment, a marriage or divorce, or contact with law enforcement, has to be disclosed at this interview. Concealment almost always causes more damage than the underlying issue.

English Test

Your spoken English is assessed during the conversation itself. You’ll also read a sentence aloud and write one down. The standard is “ordinary usage,” not academic proficiency.¹⁵

Civics Test

If you filed Form N-400 on or after October 20, 2025, the 2025 civics test applies. The officer asks 20 questions from a bank of 128. You need 12 correct to pass, and 9 incorrect answers means a fail. This replaced the older format of 10 questions from a pool of 100 with 6 correct to pass.¹⁶ Study materials for the 128-question bank are on the USCIS website.

Testing Exemptions and Disability Waivers

Two age-and-residency rules exempt you from the English portion:

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

Both groups still take the civics test but can do so in their native language and must bring their own qualified interpreter.¹⁷ Applicants who are 65 or older with at least 20 years as a permanent resident (65/20) study a shorter set of 20 questions instead of the full bank.¹⁸

If a physical or developmental disability or mental impairment prevents you from learning English or civics, Form N-648 requests a waiver of both requirements. It must be completed by a licensed medical doctor, doctor of osteopathy, or clinical psychologist who has examined you.¹⁹

If You Fail a Test

A failed English or civics test doesn’t end the case. USCIS must give you a second attempt within 60 to 90 days, and you only retake the portion you failed.²⁰ Failing the second attempt results in denial, though you can file a new N-400.

Decisions After the Interview

The officer issues one of three outcomes. An approval sends you to an oath ceremony. A continuance keeps the case open while you supply more evidence or retake part of the exam. A denial closes it out, but not permanently: you have 30 days to file Form N-336, Request for a Hearing on a Decision in Naturalization Proceedings. USCIS must schedule the hearing within 180 days, and a different officer reviews the entire case fresh. You can submit a written brief and new evidence. If the hearing officer also denies, you can seek review in federal district court.

The Oath of Allegiance

You are not a citizen until you take the Oath of Allegiance at a public ceremony, where you renounce allegiance to foreign governments and commit to supporting and defending the Constitution.²¹ Ceremonies happen at courthouses, federal buildings, and occasionally at special events.

Before the ceremony you complete Form N-445, which asks about new arrests, foreign travel, or marital changes since the interview. Bring your green card; you surrender it before taking the oath. After the oath, you receive your Certificate of Naturalization, which is your primary proof of citizenship and what you’ll use to apply for a passport. If you miss two oath ceremonies without good cause, USCIS files a motion to reopen your case and you have only 15 days to respond.²²

A Note on the Military Path

The steps above describe the civilian path. Active-duty service members and certain veterans qualify under separate rules that are substantially more generous. Peacetime service of one year qualifies under INA Section 328; honorable service during a designated period of hostility qualifies under INA Section 329 regardless of length, with no continuous residence or physical presence requirement, no age requirement, and no filing fee.²³²⁴ English, civics, and good moral character requirements still apply. Spouses of U.S. citizen service members stationed abroad may qualify for expedited processing under INA Section 319(b).²⁵

After You’re Sworn In

Update your record with the Social Security Administration by applying online for a replacement card and scheduling an appointment to present your citizenship proof; the new card arrives within 5 to 10 business days.²⁶ Apply for a U.S. passport soon after, since it’s far more practical for daily use than the Certificate. Register to vote as well. These administrative steps are easy to defer once the process is over, but handling them in the first few weeks keeps small problems from becoming bigger ones.

1
Department of Homeland Security. Citizenship and Immigration Services
2
Office of the Law Revision Counsel. 8 USC 1427 – Requirements of Naturalization
3
U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part D Chapter 6 – Jurisdiction, Place of Residence, and Early Filing
4
Office of the Law Revision Counsel. 8 USC 1423 – Requirements as to Understanding the English Language, History, Principles and Form of Government of the United States
5
Office of the Law Revision Counsel. 8 USC 1430 – Married Persons and Employees of Certain Nonprofit Organizations
6
U.S. Citizenship and Immigration Services. Instructions for Application to Preserve Residence for Naturalization Purposes
7
U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part F Chapter 4 – Permanent Bars to Good Moral Character
8
Legal Information Institute. 8 USC 1101(a)(43) – Definition: Aggravated Felony
9
U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part D Chapter 7 – Attachment to the Constitution
10
U.S. Citizenship and Immigration Services. N-400, Application for Naturalization
11
U.S. Customs and Border Protection. I-94/I-95 Website
12
eCFR. 8 CFR 106.2 – Fees
13
U.S. Citizenship and Immigration Services. Additional Information on Filing a Reduced Fee Request
14
U.S. Citizenship and Immigration Services. Form I-797C, Notice of Action
15
eCFR. 8 CFR 312.1 – Literacy Requirements
16
U.S. Citizenship and Immigration Services. Study for the Test
17
U.S. Citizenship and Immigration Services. Exceptions and Accommodations
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 Volume 12 Part B Chapter 4 – Results of the Naturalization Examination
21
eCFR. 8 CFR 337.1 – Oath of Allegiance
22
U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part J Chapter 4 – General Considerations for All Oath Ceremonies
23
U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part I Chapter 5 – Application and Filing for Service Members
24
Office of the Law Revision Counsel. 8 USC 1440 – Naturalization Through Active-Duty Service in the Armed Forces During Time of War or National Emergency
25
U.S. Citizenship and Immigration Services. Citizenship for Military Family Members
26
Social Security Administration. Update Citizenship or Immigration Status