Processing time
8–24 months
Filed with
USCIS — online or by mail
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Who needs this form?
Lawful permanent residents with 5 years as a green card holder (3 if married to a US citizen).
What does it do?
If approved, grants US citizenship. Includes English and civics tests, interview, and oath ceremony.
Key requirements
- ✓ 5 years continuous permanent residence (3 if married to US citizen)
- ✓ 30 months physical presence in the US
- ✓ 3 months in USCIS district before filing
- ✓ Basic English reading, writing, speaking
- ✓ Pass civics test (6 of 10 correct)
Common mistakes to avoid
- ⚠ Filing too early — count residence carefully
- ⚠ Extended trips abroad can break continuous residence
- ⚠ Underestimating the civics test — study all 100 questions
- ⚠ Not updating address with USCIS after filing
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Official USCIS page for Form N-400
Always download the latest version from the official source.
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