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How to fill out Form N-400, what it costs, which documents you need, and what happens after you file.

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Start hereHow do I fill out Form N-400?What to gather first, what each of the form's 16 parts asks, the small mistakes that can get it rejected, and how to file.8 min readLast reviewed November 2, 2026Read the guide
  1. How much does it cost to apply for citizenship, and can I pay less?The current Form N-400 fees, who qualifies for a reduced fee or fee waiver, how to pay, and the proposed fee increase.6 min read
  2. What documents do I need to apply for citizenship?What everyone sends with Form N-400, the extra documents your situation may call for, and what to bring to your interview.8 min read
  3. What happens after I file Form N-400? Timeline and processing timesThe receipt notice, biometrics, checking your case status, requests for evidence, moving while you wait, and when your interview comes.7 min read
  4. How do I avoid immigration scams and notarios?The warning signs of an immigration scam, why a notario can't help with your case, who legally can, and how to check them and report fraud.7 min read