Form N-400N-400
Application for US citizenship by naturalisation.
Edition 01/20/25
Version last read from the agency on September 28, 2026
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About Form N-400
Who fills it in
Form N-400 is the application for naturalization — becoming a U.S. citizen for people born outside the United States who meet the eligibility requirements.
Where it goes
File it with USCIS online or by mail. People asking for a reduced fee or a fee waiver must file by mail.
When
Most applicants may file up to 90 calendar days before they complete the continuous residence requirement.
Watch out for
- The fee on the USCIS page is $760 by mail or $710 online, with a reduced fee of $380 for those who qualify.
- Use the 01/20/25 edition. USCIS may reject a form with missing pages or pages from a different edition.
- Online, each evidence file can be up to 12 MB (PDF, JPG or JPEG).
Read from the agency’s pages on October 8, 2026: USCIS — Form N-400 · USCIS — Tips for filing forms online
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