U.S. Citizenship and Immigration Services · Federal form
Fill out Form N-400
Application for Naturalization Edition 01/20/25
USCIS says: “Form N-400, Application for Naturalization, is an application to become a naturalized U.S. citizen.” Source
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Before you file. The form says that if your mother or father (including a legal adoptive parent) is a U.S. citizen by birth, or was naturalized before your 18th birthday, you may not need Form N-400 because you may already be a U.S. citizen; it points to Form N-600, Application for Certificate of Citizenship. Source
Facts from the official source
Quoted or closely restated from USCIS's own pages and PDFs, checked .
| Fact | What the source says | Source |
|---|---|---|
| Issued by | U.S. Citizenship and Immigration Services, U.S. Department of Homeland Security | N-400, Application for Naturalization (USCIS form page) |
| Edition | Edition 01/20/25 | Form N-400 (Edition 01/20/25), official PDF Form N-400, page 1 footer (same on all 14 pages). |
| Current edition (USCIS) | USCIS lists 01/20/25 as the edition date of the current Form N-400. | N-400, Application for Naturalization (USCIS form page) N-400 form page, "Edition Date" section. |
| Where to file | The instructions point to the USCIS N-400 page for the current filing location; the form page links the Direct Filing Addresses for Form N-400 page for mailing. | Instructions for Form N-400 (01/20/25), official PDF Instructions for Form N-400 (01/20/25), page 27, "Where To File?". |
| Earliest filing date | Applicants filing on 5 years (or, through marriage to a U.S. citizen, 3 years) of permanent residence may generally file up to 90 days before meeting the required period of continuous residence. | Instructions for Form N-400 (01/20/25), official PDF Instructions for Form N-400 (01/20/25), page 3, "Early Filing". |
| Filing fee | The instructions do not print a fee amount; they refer to Form G-1055 for the fees that apply. | Instructions for Form N-400 (01/20/25), official PDF Instructions for Form N-400 (01/20/25), page 4, General Instructions, "Filing Fee". |
| Printed pages | If you print and mail the form, the edition date and page numbers must be visible on every page and all pages must be from the same edition, or USCIS may reject it. | N-400, Application for Naturalization (USCIS form page) N-400 form page, "Edition Date" section. |
| Signature | USCIS will not accept a stamped or typewritten name in place of a signature, and will reject an unsigned application or one with an invalid signature. | Instructions for Form N-400 (01/20/25), official PDF Instructions for Form N-400 (01/20/25), page 3, General Instructions, "Signature". |
| Rejected filings | USCIS rejects any Form N-400 that is not signed or not accompanied by the correct filing fee. | Instructions for Form N-400 (01/20/25), official PDF Instructions for Form N-400 (01/20/25), page 27, "Processing Information". |
| Before you file | The form says that if your mother or father (including a legal adoptive parent) is a U.S. citizen by birth, or was naturalized before your 18th birthday, you may not need Form N-400 because you may already be a U.S. citizen; it points to Form N-600, Application for Certificate of Citizenship. | Form N-400 (Edition 01/20/25), official PDF Form N-400 (Edition 01/20/25), page 1, above Part 1. |
| Reduced fee or fee waiver | A reduced fee or fee waiver request cannot be filed online: file a paper Form N-400 with the waiver request and required evidence. | N-400, Application for Naturalization (USCIS form page) N-400 form page, "Where to File", "Reduced fee or fee waiver requests". |
| Official instructions | Instructions for Form N-400 (01/20/25), 29 pages. | Instructions for Form N-400 (01/20/25), official PDF Instructions for Form N-400 (01/20/25), page 1 footer. |
| Filing options (USCIS form page) | USCIS generally accepts Form N-400 online (through a USCIS online account) or by mail (paper). | N-400, Application for Naturalization (USCIS form page) N-400 form page, "Where to File" section. |
| How USCIS suggests filling its PDFs | For the best results, USCIS suggests downloading the PDF and completing it in the latest Adobe Acrobat Reader rather than in a web browser. | Downloading and Printing Immigration Forms (USCIS) USCIS, Downloading and Printing Immigration Forms (last reviewed 10/18/2023), second paragraph. Checked . |
| The blank form is free | USCIS forms are free on uscis.gov; USCIS warns not to pay for any USCIS form. | Downloading and Printing Immigration Forms (USCIS) USCIS, Downloading and Printing Immigration Forms, closing paragraphs. Checked . |
| Typed answers (USCIS mail filing tips) | USCIS says its forms can be completed electronically and printed to mail; typed answers should be in Courier New, size 10, bold (black ink if handwritten). PDF Tower note: PDF Tower fills the form's own fields in its own Courier font, so your copy prints like a typed form. The 2D barcode area prints blank, as it does on a hand-filled form. | Tips for Filing Forms by Mail (USCIS) USCIS, Tips for Filing Forms by Mail, "Complete Your Paper Form Accurately". Checked . |
What is on the form
- Part 1. Information About Your Eligibility
- The one basis of eligibility you are filing under, and your A-Number. Form N-400, page 1
- Part 2. Information About You
- Legal and other names, optional name change, USCIS online account number, sex, date of birth, date you became a permanent resident, country of birth and citizenship, disability exception, Social Security card request. Form N-400, pages 1-2
- Part 3. Biographic Information
- Ethnicity, race, height, weight, eye color and hair color. Form N-400, page 3
- Part 4. Information About Your Residence
- Physical addresses for the required period and current mailing address. Form N-400, pages 3-4
- Part 5. Information About Your Marital History
- Marital status, current spouse and prior marriages. Form N-400, pages 4-5
- Part 6. Information About Your Children
- Number of children and details for each child. Form N-400, page 5
- Part 7. Information About Your Employment and Schools You Attended
- Employers and schools for the required period. Form N-400, page 5
- Part 8. Time Outside the United States
- Trips outside the United States during the required period. Form N-400, page 6
- Part 9. Additional Information About You
- Yes/No questions on claims to citizenship, voting, taxes, memberships, criminal history, immigration history, military service and the Oath of Allegiance. Form N-400, pages 6-10
- Part 10. Request for a Fee Reduction
- Household income, household size, earners and head of household, if requesting a reduced fee. Form N-400, page 11
- Part 11. Applicant's Contact Information, Certification, and Signature
- Applicant phone numbers, email, certification and signature with date. Form N-400, page 11
- Part 12. Interpreter's Contact Information, Certification, and Signature
- Interpreter name, organization, contact details and signature, if used. Form N-400, page 12
- Part 13. Contact Information, Certification, and Signature of the Person Preparing this Application, if Other Than the Applicant
- Preparer name, organization, contact details and signature, if used. Form N-400, page 12
- Part 14. Additional Information
- Extra space for answers that do not fit elsewhere. Form N-400, page 13
- Part 15. Signature at Interview and Part 16. Oath of Allegiance
- Signed at the interview and before the oath ceremony, as USCIS instructs. Form N-400, page 14
Checked by PDF Tower: the official PDF has 14 pages and 440 fillable fields (237 text, 198 checkbox or radio), 758 KB. SHA-256 8b33868ba071e261…, computed .
Edition and revisions
- Edition on this page: Edition 01/20/25.
Sources
- N-400, Application for Naturalization (USCIS form page) Retrieved .
- Form N-400 (Edition 01/20/25), official PDF Retrieved .
- Instructions for Form N-400 (01/20/25), official PDF Retrieved .
- Downloading and Printing Immigration Forms (USCIS) Retrieved .
- Tips for Filing Forms by Mail (USCIS) Retrieved .
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