Form N-400: Application for Naturalization

Filing Guide

N-400 is generally available once you've held a green card for the required period (typically 5 years, or 3 years if you obtained your green card through marriage to a U.S. citizen and are still married to them), and you meet continuous residence and physical presence requirements. It involves a civics and English test (with some exceptions for age or disability), and typically an interview with a USCIS officer.

This is usually the final formal step in an individual immigration journey, though it's entirely optional — permanent residents aren't required to naturalize.

Required Documents

• Green card (copy, front and back)
• Tax records or evidence of tax compliance for the relevant period
• Marriage certificate and, if applicable, divorce decrees from prior marriages
• Selective Service registration proof, if applicable
• Any court or police records, if you have anything to disclose
• A full, honest travel history for the required look-back period

Common Mistakes

• Filing before actually meeting the continuous residence or physical presence requirements
• Incomplete or inconsistent travel history, which gets carefully checked against your own records
• Failing to disclose past legal issues, even minor ones, out of fear rather than caution
• Not preparing at all for the civics and English test, which does have a real failure rate
• Assuming naturalization is guaranteed once you're eligible on paper — "good moral character" is a real, assessed requirement

Frequently Asked Questions

Do I need to give up my other citizenship to naturalize?

Generally no — the U.S. doesn't require renouncing other citizenships, though your home country's rules on dual citizenship may differ.

What if I fail the civics or English test?

You generally get a second attempt at a later date on the parts you didn't pass, rather than having to restart the entire process.

Can I travel while N-400 is pending?

Yes, but extended trips can affect your continuous residence, so it's worth being cautious about lengthy travel during this period.

Typical Process Flow

File N-400 → Receipt notice → Biometrics (if not already on file) → Interview (including civics/English test) → Decision → Oath ceremony (if approved) → Certificate of Naturalization issued.