US Citizenship Naturalization Form N-400 Guide (2026)

Naturalization is the process of becoming a US citizen after meeting residence and physical presence rules as a green card holder. The path runs from filing Form N-400, through a biometrics appointment, a civics and English test, an interview, and finally the oath of allegiance ceremony. Most applicants qualify after 5 years as a lawful permanent resident, or 3 years if married to and living with a US citizen the entire time. You receive a certificate of naturalization that proves your citizenship for life.

This guide is informational and not legal advice. Verify the current rules on the official USCIS or travel.state.gov page linked at the end.

Naturalization eligibility under INA section 316 (general) or 319 (spouse of US citizen) has six core tests. All must be met at the time of filing N-400 and at the time of the oath ceremony.

Age: at least 18 years old at filing. Children under 18 derive citizenship through their US citizen parents under different rules, not N-400.

Lawful permanent resident status: hold a valid 10-year green card. Conditional 2-year residents must remove conditions first via I-751 or I-829. Permanent residents whose green card is expired can still file N-400, but USCIS verifies status through their internal records.

Continuous residence: have continuously resided in the United States as a lawful permanent resident for the qualifying period:

• 5 years: the general rule for most applicants under INA 316.
• 3 years: if married to and living with a US citizen for the entire 3 years, under INA 319(a). The marriage and the spouse's citizenship must both have been continuous for the 3 years before filing.
• 1 year: for asylees and refugees, with some additional rules.
• Special rules: for spouses of US citizens employed abroad in specific roles, military service members, and a few other special categories.

Physical presence: physically present in the United States for at least half of the qualifying period (30 months out of 5 years, or 18 months out of 3 years). Extended absences disrupt physical presence: a single absence of 6 to 12 months is presumed to disrupt continuity unless rebutted, and any absence of 12 months or more disrupts continuous residence entirely (with limited Form N-470 protections).

You can file N-400 up to 90 days before the eligibility date. So if your 5-year anniversary as a permanent resident is November 1, you can file N-400 on August 3 (90 days earlier). The eligibility date itself must arrive before the interview.

Good moral character: USCIS evaluates your character during the qualifying period and at the time of the oath. Criminal history, tax issues, failure to register for Selective Service (men 18 to 26), unpaid child support, immigration fraud, and certain marriages or false statements can bar good moral character.

English and civics knowledge: tested at the interview unless you qualify for an exemption (age plus length of residence exemptions, or medical disability exemption via Form N-648).

The N-400 packet is moderate in complexity. The form itself collects detailed biographic, residence, employment, travel, family, criminal, and political affiliation history. Supporting documents establish the underlying eligibility.

Core packet components:

• Form N-400: the main application. E-filing through myUSCIS is the recommended path; paper filing is available.
• Copy of green card: front and back of current or expired card.
• Marriage evidence (for the 3-year rule): marriage certificate, evidence of US citizen spouse's status (passport, birth certificate, or naturalization certificate), joint financial records demonstrating the marriage continued the full 3 years.
• Prior marriage termination documents: divorce decrees, death certificates, annulments for any prior marriages.
• Travel history: detailed list of every trip outside the US during the qualifying period. USCIS validates against I-94 records and CBP entry data.
• Tax evidence: tax transcripts for the last 3 to 5 tax years (depending on rule). Unfiled or unpaid taxes are a common naturalization issue.
• Selective Service confirmation: for men aged 18 to 26 at any time during the qualifying period.
• Criminal history evidence: certified court dispositions for any arrests, even if charges were dismissed, expunged, or sealed.
• Two passport-style photos: ONLY required if filing from outside the United States. Most domestic N-400 filings do not require uploaded photos because USCIS captures the biometric photo at the ASC.
• Filing fee: pay the N-400 filing fee plus biometric services fee (these may be bundled under current USCIS rules). Fee waiver via Form I-912 available for low-income applicants.

The N-400 form is long but most fields are straightforward biographic and travel data. The criminal and good moral character section is where applicants most often need to think carefully. Disclose every arrest, even sealed or expunged ones; concealment is grounds for denial and possible deportation. When in doubt, consult an attorney.

USCIS schedules biometrics within 4 to 8 weeks after N-400 filing. The appointment is at an Application Support Center near the applicant's US address.

What happens at biometrics:

• Fingerprinting (all 10 fingers digitally).
• Photo capture (digital, used for the eventual certificate of naturalization).
• Signature capture.
• Identity verification against the green card.

What to bring:

• Biometrics appointment notice (Form I-797C).
• Government-issued photo ID: green card, driver's license, state ID, or passport.
• Any communication from USCIS about the case (receipt notice, request for evidence response).

Biometrics is a quick visit, usually 15 to 30 minutes total. The ASC photo is captured digitally and becomes the photo on your certificate of naturalization. Dress neatly, do not wear glasses unless medically necessary, and ensure your face is fully visible. The technician will instruct on positioning.

If you have a disability that affects fingerprinting (worn fingerprints, missing fingers, severe arthritis), USCIS has alternative procedures. The ASC technician will document the issue and USCIS may approve a fingerprint waiver through its background check workflow.

Rescheduling biometrics is allowed for valid reasons. Submit a written request through myUSCIS at least 24 hours before the appointment. Persistent no-shows can lead to N-400 denial.

The fingerprints feed FBI name checks and other security databases. Most checks clear within days or weeks. A delayed background check can hold up N-400 adjudication even when the rest of the file is in order.

After biometrics, USCIS schedules the interview. Wait time from biometrics to interview varies by field office but averages 6 to 12 months in 2026, with some offices much faster and some slower.

The civics and English tests are administered at the naturalization interview. They are the most distinctive part of N-400 because they require active preparation, not just paperwork organization.

English test has three components:

• Speaking: tested implicitly through the interview itself. The officer assesses whether you can answer interview questions in English.
• Reading: read one of three sentences aloud correctly.
• Writing: write one of three sentences correctly.

USCIS publishes the reading and writing vocabulary lists in advance. The vocabulary focuses on US civics, government, and basic everyday concepts.

Civics test follows the official format:

• USCIS asks up to 10 questions from a list of 100 civics questions.
• You need at least 6 correct answers to pass.
• Topics include US history, government structure, current officeholders, civic responsibilities, and US geography.
• USCIS publishes the full 100-question list with model answers at uscis.gov.

Exemptions exist for some applicants:

• Age 50 with 20 years of permanent residence: take the civics test in your native language; English test is waived.
• Age 55 with 15 years of permanent residence: same exemption.
• Age 65 with 20 years of permanent residence: take a simplified 20-question civics test in your native language, with 6 correct to pass; English test waived.
• Medical disability: Form N-648 medical certification can waive English, civics, or both for applicants whose physical or developmental disability prevents learning these subjects.

Prepare using the official USCIS study materials at uscis.gov/citizenship. The 100-question civics list, the reading vocabulary, and the writing vocabulary are all free. Audio versions are available for the civics list. There are also free practice tests through the USCIS Civics Test Practice Tool.

If you fail the civics or English test at the first interview, USCIS schedules a second attempt 60 to 90 days later at no additional fee. Failing the second attempt results in N-400 denial, but you can refile a new N-400 later after additional preparation.

The naturalization interview is the substantive review of your N-400. It is held at a USCIS field office, typically lasting 30 to 60 minutes. The officer reviews your application, administers the tests, and decides whether to recommend approval.

What happens during the interview:

• Identity verification: officer checks your green card and government-issued ID.
• Oath to tell the truth: standard at the start of every interview.
• N-400 review: the officer reads through the application with you, asking about each section. Pay attention; the officer may correct outdated entries (new address, recent travel, recent employment changes).
• Good moral character questions: the officer asks the criminal, immigration, and good moral character questions on the form. Answer truthfully even for uncomfortable questions.
• Travel and physical presence verification: the officer cross-checks your trip list against I-94 records. Long absences require explanation and evidence of maintained US residence.
• Tax verification: the officer may ask about tax filings and unpaid taxes. Bring tax transcripts.
• English test: speaking is tested through the conversation; reading and writing are administered separately.
• Civics test: 10 questions from the 100-question list.
• Decision: the officer typically decides at the end of the interview. Possible outcomes: recommended approval (oath scheduled), continued (additional review needed), denied (with appeal rights).

Bring an updated document binder to the interview:

• Government-issued ID and current green card.
• Updated travel records since N-400 filing.
• Tax transcripts for the last 5 years.
• Selective Service confirmation for men.
• Marriage and prior marriage termination documents for 3-year rule cases.
• Court records for any arrests, citations, or charges.
• Evidence of any name changes (court orders, marriage certificates).
• Evidence of US ties (employment, property, family).

Some applicants are scheduled for a "combined" interview that bundles N-400 with the oath ceremony on the same day. Others receive an interview decision first and a separate oath ceremony notice (Form N-445) for a later date.

The oath of allegiance is the final step in naturalization. Taking the oath is what actually confers US citizenship. The interview approval recommends the oath, but you are not a US citizen until the oath is administered.

Oath ceremony formats:

• Same-day ceremony: held immediately after the interview when the schedule allows. The officer recommends approval, hands you a Form N-445 ceremony notice, and points you to the ceremony room. You walk in as a permanent resident and walk out as a US citizen.
• Scheduled ceremony: USCIS mails Form N-445 with a specific date and location. Ceremonies are typically held at USCIS field offices, federal courthouses, or large public venues for group naturalizations.
• Judicial ceremony: held in federal or state court before a judge. Some applicants prefer this format for the formality; some courts have long backlogs.

What to expect at the ceremony:

• Check-in with USCIS staff, surrender your green card (you will not need it anymore).
• Mass swearing-in ceremony with other naturalization candidates.
• Recitation of the Oath of Allegiance.
• Singing of the national anthem and Pledge of Allegiance.
• Distribution of certificates of naturalization.

What to bring:

• Form N-445 ceremony notice, completed with answers to the post-interview questionnaire (have you taken any trips, been arrested, etc., since the interview).
• Current green card (you will surrender it).
• Reentry permit or other USCIS documents you hold.
• Photo identification.
• Family members and friends as guests (most ceremonies welcome family).

The Certificate of Naturalization is the official proof of your US citizenship. Treat it like a passport: keep it in a safe location, do not laminate it (USCIS will not replace laminated certificates), and use it to apply for a US passport, update Social Security, and register to vote.

US citizenship grants substantial new rights and a few new responsibilities. Several follow-up actions matter in the first weeks after the oath ceremony.

Immediate priorities:

• Apply for a US passport: file Form DS-11 at a passport acceptance facility (most US post offices, some libraries, some county clerks). Bring your Certificate of Naturalization, a passport-style photo, and a check for the passport fee. Routine processing takes 6 to 12 weeks; expedited 2 to 4 weeks.
• Register to vote: register with your state or local election office. Many states allow online voter registration. Voter registration is a civic right and responsibility of US citizens.
• Update Social Security: visit a Social Security office or update online to change your status to US citizen. This unlocks federal benefits not available to permanent residents.
• Update employer records: complete a new Form I-9 with your employer reflecting your US citizenship.

New rights:

• Vote in federal, state, and local elections.
• Hold federal jobs, run for elected office (most positions; the presidency requires natural-born US citizenship).
• Sponsor a wider range of family members for green cards: spouses, parents, unmarried and married children of any age, and siblings. Permanent residents can only sponsor spouses and unmarried children.
• Pass citizenship to children automatically in many cases.
• Re-enter the United States after any length of absence without abandonment concerns.
• Hold a US passport, which opens visa-free or visa-on-arrival travel to many countries.

Dual citizenship: US law allows dual citizenship in practice; the US does not require you to renounce your prior citizenship at the oath. Check your home country's law because some countries automatically revoke their citizenship when you naturalize elsewhere, while others require formal renunciation. Israeli, German, Indian, and Japanese rules each differ.

Taxes: US citizens are taxed on worldwide income regardless of where they live. If you move abroad after naturalization, you continue to file US tax returns annually under the Foreign Earned Income Exclusion and other rules.

Most domestic N-400 filings do not require photo upload because USCIS captures the biometric photo at the Application Support Center during biometrics. N-400 filings from abroad (military filings from overseas, USCIS international office filings) typically require two passport-style USCIS photos with the application. If you need a passport-style photo for related filings (post-naturalization US passport, Selective Service replacement, REAL ID), use our photo validator and review the full US passport photo or green card photo rules before printing.