The Peng Law
N-400 Naturalization / US Citizenship
Naturalization is the legal process by which a permanent resident (green card holder) obtains U.S. citizenship.
Naturalization is the legal process by which a permanent resident (green card holder) obtains U.S. citizenship. Eligible green card holders apply by filing Form N-400 with USCIS. General requirements include holding a green card for at least 5 years (3 years if married to a U.S. citizen), meeting physical presence requirements, passing English language and U.S. civics/history tests, and demonstrating good moral character. Upon naturalization, citizens gain the right to vote, travel visa-free to many countries, petition for a wider range of family members, and protection from deportation. The U.S. permits dual citizenship, though some countries do not.
Must be at least 18 years old and a permanent resident (green card holder)
Must have held a green card for at least 5 years (3 years if married to and living with a U.S. citizen spouse)
Must have been physically present in the U.S. for at least 30 months during the 5-year (or 3-year) period before filing
Must have resided in the state or USCIS district of filing for at least 3 months
Must have maintained continuous residence in the U.S. since obtaining the green card, with no single absence exceeding 6 months
Must demonstrate good moral character — no serious criminal record, no outstanding tax issues, no immigration fraud, etc.
Must be able to read, write, and speak basic English (50/20 and 55/15 exemptions apply to elderly applicants)
Must pass the U.S. civics test (6 out of 10 questions from a pool of 100)
Must be willing to take the Oath of Allegiance to the United States
Confirm Eligibility
Verify that all requirements are met — time as a green card holder, residency, good moral character, etc. Filing is permitted up to 90 days early (i.e., at 4 years and 9 months of holding a green card).
File Form N-400
Submit Form N-400 to USCIS online or by mail with the $760 filing fee (the separate biometrics fee was eliminated by the 2024 fee rule).
Biometrics Appointment
Attend a designated ASC for fingerprints and photographs for the background check.
Naturalization Interview
Attend the USCIS interview, which includes an English language test (reading, writing, speaking) and civics test (6 out of 10 questions). The officer will also review the N-400 application.
Receive Decision
A decision is provided on the day of the interview or shortly after: Approved, Continued (for additional testing), or Denied.
Oath Ceremony
Attend the Oath of Allegiance ceremony. Upon taking the oath, you officially become a U.S. citizen and receive a Certificate of Naturalization.
| Stage | Duration |
|---|---|
| File N-400 | At 4 years 9 months or later |
| Biometrics | 3–8 weeks after filing |
| Interview | 5–12 months after filing |
| Oath Ceremony | 1 day to 3 months after passing the interview |
| Overall Timeline | Approximately 6–15 months |
U.S. law permits dual citizenship — you are not required to renounce your original nationality when naturalizing. However, important considerations include: (1) China does not recognize dual citizenship — Chinese nationality is automatically lost upon U.S. naturalization (household and passport cancellation at a Chinese consulate is required); (2) some other countries also prohibit dual citizenship; (3) the Oath of Allegiance includes language about "renouncing allegiance to foreign states," but this does not automatically cancel foreign nationality as a matter of law. Understanding your country of origin's nationality laws before naturalizing is recommended.
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Reviewed March 2026. This page is general information, not legal advice; rely on written attorney guidance for your own matter.