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The Path to U.S. Citizenship: Naturalization Steps, Eligibility, and Requirements

Published: April 13, 2026 • 9 min read • Verified by Legal Editorial Board
The Path to U.S. Citizenship: Naturalization Steps, Eligibility, and Requirements
Quick Summary

Naturalization is the statutory legal process under the Immigration and Nationality Act (INA) through which a lawful permanent resident (Green Card holder) becomes a United States citizen. Key prerequisites include five years of continuous residence (or three years if married to a U.S. citizen), physical presence, good moral character, and passing the naturalization examination.

Statutory Eligibility for Naturalization

To qualify for U.S. citizenship through naturalization under Section 316 of the INA, an applicant must satisfy strict legal conditions prior to submitting USCIS Form N-400:

  • Age Requirement: Must be at least 18 years of age at the time of filing.
  • Permanent Residence Status: Must have held a valid Lawful Permanent Resident (LPR) card for at least five continuous years (or three years if married to and living with a U.S. citizen spouse).
  • Continuous Residence: Must have maintained continuous residence in the United States. Absences exceeding six months create a presumption of breaking continuous residence; trips over one year disrupt continuous residence as a matter of law.
  • Physical Presence: Must have been physically present in the United States for at least 30 months out of the 60-month qualifying period (or 18 months out of 36 months under the three-year marriage exception).
  • State or District Jurisdiction: Must have resided for at least three months in the state or USCIS service district where the application is submitted.

The Good Moral Character Requirement

Applicants must demonstrate "Good Moral Character" (GMC) throughout the statutory period. Statutory bars that permanently or conditionally disqualify an applicant include:

  • Permanent Bars: Any conviction for an Aggravated Felony on or after November 29, 1990, or involvement in genocide or torture.
  • Conditional Bars: Crimes Involving Moral Turpitude (CIMT), multiple gambling offenses, failure to pay court-ordered child support, willful failure to file federal income taxes, or lying under oath during immigration interviews to obtain benefits.

Step-by-Step Naturalization Process

  1. Filing Form N-400: Prepare and submit the application online or by mail, attaching evidence of continuous residence, tax transcripts, and required fee waivers or payments. Applicants may file up to 90 days prior to reaching the 5-year or 3-year anniversary.
  2. Biometrics Appointment: Attend a local USCIS Application Support Center (ASC) for digital fingerprinting and criminal background screening through FBI databases.
  3. In-Person Naturalization Interview: Meet with a USCIS adjudications officer who tests English language skills (speaking, reading, writing) and civics knowledge.
  4. Decision Notice (Form N-652): Receive approval, request for additional evidence (RFE), or notification of denial.
  5. Oath of Allegiance Ceremony: Surrender the Green Card, take the official Oath of Allegiance, and receive the Certificate of Naturalization (Form N-550).

Key Legal Next Steps

  1. Obtain official certified IRS tax transcripts for the preceding five tax years prior to submitting Form N-400.
  2. If you have any prior arrests or citations, even if dismissed or expunged, secure certified disposition records from the court clerk before applying.
  3. Consult a licensed immigration attorney if any international absence exceeded 180 continuous days.

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