N-400 naturalization and U.S. citizenship

Who qualifies to naturalize

The baseline requirements are: at least 18 years old; lawful permanent resident status; continuous residence in the United States for the required period; physical presence for at least half that period; three months' residence in the state or USCIS district where you file; good moral character; English proficiency; knowledge of U.S. civics; and attachment to the principles of the Constitution.

Five years is the standard residence period. It drops to three years for a permanent resident married to and living with the same U.S. citizen for the whole three years, where the spouse has been a citizen throughout. If the marriage ends or the citizen spouse loses citizenship before the oath, the three-year basis fails and the five-year clock applies. Separate rules exist for members of the armed forces and for spouses of citizens stationed abroad.

Continuous residence is not the same as physical presence, and the distinction catches people. An absence of more than six months but less than a year creates a rebuttable presumption that continuity was broken — you can overcome it with evidence of maintained ties: a home, employment, tax filings, family. An absence of one year or more breaks continuity outright, with narrow exceptions requiring an approved Form N-470 filed in advance. People who spent a long stretch abroad and did not know about N-470 are a recurring category of avoidable denial.

Physical presence requires at least 30 months of the five years, or 18 months of the three years, actually inside the United States. Add up every trip honestly before filing; USCIS has the travel record.

Good moral character is assessed over the statutory period and, where relevant, beyond it. Statutory bars include certain criminal convictions, and an aggravated felony conviction on or after November 29, 1990 is a permanent bar. Discretionary concerns include unpaid taxes, failure to register for Selective Service where required, failure to pay court-ordered child support, and false claims to U.S. citizenship — which can be catastrophic well beyond the naturalization application.

English and civics. You must read, write, and speak basic English and pass a civics test. Age and residence exemptions exist: 50/20, 55/15, and a partial exemption at 65/20 with a reduced question set. A medically documented disability can support a disability exception via Form N-648.

The single most important thing to understand: filing an N-400 puts your whole immigration history in front of an officer. If there is an unresolved problem — a criminal issue, a misrepresentation on an earlier application, abandonment of residence, a fraudulent basis for the underlying green card — naturalization is the point at which it surfaces, and the consequence can be removal proceedings rather than a denial. This is precisely the scenario where an attorney should look at the record before anything is filed.

• Five years as a permanent resident, or three years married to and living with a U.S. citizen.
• Physical presence for at least half the required period.
• Absences over six months raise a presumption against continuous residence; a year or more breaks it.
• Good moral character is assessed over the statutory period, with some permanent bars.
• English and civics tests apply, with age-and-residence and disability exceptions.

What an N-400 application needs

The form itself is long but not complicated. The work is in the supporting record and in identifying, before filing, anything that needs to be addressed rather than discovered.

Core documents. A copy of both sides of the permanent resident card, and where filing on the three-year basis, the marriage certificate, evidence of the spouse's U.S. citizenship, and evidence of living in marital union throughout the period.

Travel history. Every trip outside the United States during the statutory period, with dates. Reconstruct it from passport stamps, boarding passes, and the CBP travel history rather than from memory — a discrepancy between what you list and what CBP holds is an unnecessary credibility problem.

Tax compliance. Tax transcripts for the statutory period. Where taxes are owed, evidence of a payment plan in good standing. Where you filed as a nonresident or claimed to be a nonresident for tax purposes while holding a green card, get advice before filing — that fact pattern raises abandonment-of-residence questions.

Criminal history. Certified dispositions for every arrest, citation, or charge, including dismissals, expunged matters, and cases where no charge was filed. The form asks about arrests, not convictions, and omitting an arrest because it went nowhere is a misrepresentation. Anything involving a criminal record needs review by an immigration attorney before filing, because the interaction between criminal history and immigration law is not intuitive and the consequences run past the application.

Selective Service registration evidence for men who lived in the U.S. between 18 and 26, or a status information letter where registration did not occur.

Child support, where court-ordered: evidence of compliance.

Name change, where requested: naturalization is an opportunity to change your legal name through the court that administers the oath.

How naturalization proceeds

You file Form N-400 with USCIS, on paper or online, with the fee or a fee-reduction request. You may file up to 90 days before completing the required residence period, though the period itself must be complete by the time of the oath.

USCIS schedules biometrics for fingerprinting and background checks, unless prior biometrics are reused.

The interview is the substantive step. An officer reviews the application with you under oath, tests English reading, writing, and speaking through the conversation and short exercises, and administers the civics test. The officer also goes through your travel history, tax filings, criminal history, and anything unusual in your file. Answers that differ from earlier applications get examined, which is why consistency across your entire immigration history matters more than any single answer.

If you do not pass the English or civics test, you get a second attempt, generally scheduled within a defined window. Failing twice results in denial, though you may reapply.

On approval, you take the Oath of Allegiance at a ceremony, surrender the permanent resident card, and receive a Certificate of Naturalization. You are a citizen from the moment of the oath — not from the approval.

If the application is denied, you may request a hearing on Form N-336 and, if that fails, seek review in federal district court. Where a denial rests on a finding that also undermines permanent residence, the situation is considerably more serious than a lost application, and it needs counsel immediately.

What naturalization costs

The N-400 has a paper filing fee and a lower online filing fee. A reduced fee is available where documented annual household income is at or below 400% of the Federal Poverty Guidelines — that request requires a paper filing. Applicants who qualify under INA sections 328 or 329 based on military service pay nothing. A full fee waiver is available to some applicants under Form I-912. Current amounts are in the fee calculator.

Many people complete an N-400 without a lawyer, and for a clean record that is a reasonable choice — the form is answerable and USCIS publishes the civics questions. The cases where attorney review earns its cost are specific and identifiable: any criminal history at all including dismissed charges, extended absences from the United States, tax filings inconsistent with permanent residence, prior immigration applications containing anything you would not repeat today, a green card obtained through a marriage that later ended, or any prior contact with immigration enforcement.

In those situations the value is not in filling out the form. It is in finding out, before you file, whether filing is safe.

What causes N-400 problems

Naturalization issues tend to surface at interview rather than as written requests, and the recurring ones are predictable.

• Absences over six months with no evidence of maintained U.S. ties to rebut the presumption against continuous residence.
• An absence of a year or more without an approved Form N-470 filed in advance.
• Physical presence short of the required total — usually an arithmetic error discovered by the officer, not the applicant.
• Undisclosed arrests, including dismissed and expunged matters. The question asks about arrests.
• Tax problems — unfiled returns, balances owed without a payment plan, or nonresident filings while holding a green card.
• Inconsistencies with earlier applications, which raise questions about the earlier filing rather than just this one.
• Selective Service non-registration for men who lived in the U.S. between 18 and 26.
• Marriage-based three-year filings where the marital union did not continue throughout the period.

Where to look next

Common questions