Form N-400
Application for Naturalization
Apply to become a U.S. citizen through naturalization.
Filing fee
$760 (online) / $760 (paper)
Biometrics: Included
Processing time
4–12 months
Varies by service center
Online filing
Available
File via my.uscis.gov
Form edition
2024
Only the current edition is accepted
Who files Form N-400?
Lawful permanent residents who meet the residency, physical presence, good moral character, and English/civics requirements.
Where to file
Online via USCIS account, or by mail to the Phoenix, Dallas, or Lewisville Lockbox.
Always verify the current address or online filing option on the official USCIS Form N-400 page before sending — lockbox assignments change.
Common mistakes to avoid
- Filing before meeting the 30-month physical presence requirement (5-year track)
- Not disclosing arrests, citations, or tax issues
- Failing to register for Selective Service (male applicants who were LPRs 18–25)
Filing tips
- File online for faster processing and easier evidence uploads
- Use the 90-day early filing rule to file before the 5- or 3-year anniversary
- Study both civics and English test materials — free prep materials on uscis.gov
Frequently asked questions
What is Form N-400?
Apply to become a U.S. citizen through naturalization.
Who files Form N-400?
Lawful permanent residents who meet the residency, physical presence, good moral character, and English/civics requirements.
How much is the Form N-400 filing fee?
The current filing fee is $760 (online) / $760 (paper). Confirm the current amount on USCIS.gov before filing — fees changed most recently in the 2024 USCIS fee rule.
How long does Form N-400 take to process?
USCIS currently reports 4 months to 12 months for most cases. Processing times vary by service center and workload. Check the USCIS Case Processing Times tool for the latest estimates.
Can I file Form N-400 online?
Yes. Form N-400 can be filed online through a free USCIS account at my.uscis.gov. Online filing provides faster receipt notices and easier status tracking.
Related forms
Cost deep dive
Looking for a full cost breakdown including biometric fees, fee waivers, and payment methods? See the Form N-400 cost page.
Sources & Citations
All claims in this guide link to primary government sources.
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- 2USCIS Case Processing Times— USCIS
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Not legal advice. This page is a plain-English summary for educational use. Current fees, processing times, and filing locations are controlled by USCIS and may change without notice. For case-specific guidance, consult a licensed immigration attorney.