On this page
- Quick summary
- Overview (What is Form N-400?)
- Context and workflow
- Requirements snapshot
- Eligibility Category Codes
- Failure prevention (What causes Form N-400 rejections?)
- What it asks for (What does Form N-400 ask for?)
- What you need (What do you need for Form N-400?)
- Checklist (What is the Form N-400 checklist?)
- Processing times
- Where to file
- Fees
- Form sections (What sections does Form N-400 have?)
- Choose your path
- Category comparison
- Strategy tips
- Mistake severity
- Examples (What are examples for Form N-400?)
- Common misconceptions (What misconceptions surround Form N-400?)
- Edge cases and variations
- Scenarios
- Key differentiators
- Why it matters
- Next steps
- Verification
- Related guides
- Resources
Quick summary
#Applicants must be at least 18 years old and have been a lawful permanent resident for a certain period.
When you meet the eligibility requirements for naturalization or a certificate of citizenship
Include it with your application package and follow official instructions for submission.
Names, dates of birth, and passport details on other forms Program checklist requirements Supporting documents and translations
Overview (What is Form N-400?)
#By successfully navigating the naturalization process, applicants can achieve the significant milestone of U.S. citizenship, opening new opportunities and responsibilities as members of the American community.
First page of N-400 form
Source: N-400 PDF
Context and workflow
#Processing time for N-400 varies by case type and current workload — always check the official USCIS processing time tool.
Why this matters
- Inconsistencies often trigger returns or follow-up requests because they create uncertainty in the case record.
- This form acts as a cross-check point: details here must match other forms and supporting documents.
Where it fits in the workflow
- Initiating the naturalization process.
- Receipt Notice (a related form) confirms USCIS has received your application.
- Attend biometrics appointment (fingerprints, photo, and signature).
- Interview and testing for English and civics knowledge.
- Oath ceremony for successful applicants.
- N-400 is commonly filed alongside Form N-648.
Who uses it
Applicants must be at least 18 years old and have been a lawful permanent resident for a certain period. Common filers: 5-Year LPR, 3-Year Marriage to U.S. Citizen, Military Service.
When it is used
- When you meet the eligibility requirements for naturalization or a certificate of citizenship
- After completing the required residency or physical presence period (if applicable)
- When you are ready to apply for formal recognition of U.S. citizen status
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Requirements snapshot
#- Supporting documents must establish identity, relationship, and required physical presence.
Eligibility Category Codes
#Eligibility information for this form. Confirm your category in the official instructions before filing.
This is a shortlist of common categories. The official instructions include many more.
| Code | Who applies |
|---|---|
| General | Applicants must be at least 18 years old and have been a lawful permanent resident for a certain period. |
| Eligibility | Form N-400 is used to apply for U.S. citizenship through naturalization. It collects information about the applicant's eligibility, background, and personal details to determine if they meet the requirements for naturalization. |
Failure prevention (What causes Form N-400 rejections?)
#Technical rejections
- Submitting the application before meeting residency requirements.
- Failing to sign the application correctly.
- Ensure form edition is current
Substantive weaknesses
- To avoid filing before meeting continuous residence or physical presence: Verify you meet the 5-year (or 3-year if marriage-based) requirement before filing.
- To avoid failing the civics or english test: Study the 100 civics questions; request accommodations if you qualify for an exception.
- To avoid incorrect or incomplete biographical or travel history: List all trips outside the U.S. and ensure all addresses and employment match records.
- To avoid missing required photos or supporting documents: Include two passport-style photos and proof of status as required per instructions.
What it asks for (What does Form N-400 ask for?)
#- Biographic information including your current legal name and any other names used.
- Details about your residence and physical presence in the United States.
- Employment history and time spent outside the United States.
- Applicant biographical and contact information
- Proof of eligibility (citizenship or residency as applicable)
- Evidence of parent-child or guardian relationship where applicable
- Identity and supporting documentation
- Applicant or guardian certification and signature
What you need (What do you need for Form N-400?)
#- A copy of your Permanent Resident Card (green card).
- The current edition of N-400
- Submit a full English translation for any document in a foreign language.
- Tax returns for 5 years
- Travel records
- 2 passport photos
- Marriage certificate
- Evidence of marital union (joint taxes, lease, bank accounts)
- Spouse's citizenship evidence
- N-426 Request for Certification of Military Service
Checklist (What is the Form N-400 checklist?)
#- Download the current N-400 and instructions from the official USCIS website
- Review the N-400 instructions for statutory requirements and required evidence
- Collect evidence of your citizenship status, relationship details, and the necessary physical presence.
- Complete all required sections of N-400
- Ensure that the form is signed and dated in all necessary sections.
- Confirm your mailing address is current and correct
- Sign and date your Form N-400, ensuring that all required supporting evidence accompanies your submission.
Processing times
#| Category | Processing time |
|---|---|
| Application for Naturalization | 5.5 to 15 monthsas of January 2026 |
- Processing times for N-400 vary by eligibility category and service center. Data sourced from the official USCIS processing times tool.
- Processing times differ significantly by eligibility category. Initial applications, renewals, and replacements each go through different adjudication queues, and some categories consistently take longer than others.
- Renewal filings are often processed differently than initial applications. If you are renewing, file well before your current authorization expires — some categories allow you to continue working while the renewal is pending if filed on time.
- The service center assigned to your case affects how long it takes. USCIS distributes filings across multiple centers, and each has different workloads. You cannot choose which center processes your case.
- To check your estimated timeline: visit the official USCIS processing times tool, select your form and eligibility category, and note that the tool shows the filing date of cases currently being worked on — not a countdown from when you filed.
- While pending: track your case status online with your receipt number, respond promptly to any requests for additional evidence, and update your address through your USCIS account if you move.
Where to file
#Online filing is available for some categories — verify on the official form page. Otherwise, file by mail to the address in the instructions.
File online
Filing Your Form N-400 Online You must create a USCIS online account to file your Form N-400 online
Filing locations and procedures may change. Always verify on the official USCIS website before submitting. For related guidance, see Petition to Remove Conditions on Residence.
Fees
#| Component | Amount |
|---|---|
| Filing FeeThe standard filing fee for form n-400. Check the current fee on the official USCIS fee schedule. | See official schedule |
| Biometrics Services FeeAttend a biometric services appointment if required. | See official schedule |
Can the Form N-400 fee be waived?
Fee waivers may be available for qualifying applicants. See official instructions for eligibility.
What happens if I submit the wrong fee?
USCIS will reject your application if the incorrect fee is submitted. Verify the current fee on the official schedule before filing.
Fee waiver: Fee waivers may be available for qualifying applicants. See official instructions for eligibility. For related guidance, see Application to Register Permanent Residence or.
Fees change; always verify on USCIS.
Form sections (What sections does Form N-400 have?)
#Personal Information
Applicant identification.
- Full name and A-Number if applicable
- Date of birth and nationality
- Current address and contact
Eligibility
Basis for the application.
- Category or classification claimed
- Supporting evidence type
- Dates establishing eligibility
Supporting Documents
Required attachments.
- Identity and status documents
- Category-specific evidence
- Fee payment or waiver request
Choose your path
#Choose your path based on your eligibility category. Each block summarizes who qualifies, what to file, common mistakes, and typical processing time.
5-Year LPR
5-year
LPRs with 5+ years of permanent residence, 30 months physical presence, and continuous residence.
File with:
- Green card
- Tax returns for 5 years
- Travel records
- 2 passport photos
Common mistakes:
- Trips abroad exceeding 6 months breaking continuous residence
- Not having 30 months physical presence within 5-year period
- Failing to disclose all trips abroad
Typical processing: 8-14 months
3-Year Marriage to U.S. Citizen
3-year
LPRs married to and living with U.S. citizen spouse for 3+ years. Must still be married at time of oath.
File with:
- Green card
- Marriage certificate
- Evidence of marital union (joint taxes, lease, bank accounts)
- Spouse's citizenship evidence
Common mistakes:
- Divorcing or separating before naturalization oath
- Not maintaining marital union during the 3-year period
- Insufficient evidence of living together
Typical processing: 8-12 months
Military Service
military
Current or former U.S. Armed Forces members. Peacetime: 1 year service. Wartime: any period of service during designated conflict.
File with:
- DD-214
- N-426 Request for Certification of Military Service
- Military ID
Common mistakes:
- Not obtaining N-426 certification before filing
- Dishonorable discharge disqualifying applicant
- Not filing during or within 6 months of service for expedited processing
Typical processing: 5-8 months
Category comparison
#| Category code | Eligibility | Typical filing companion | Auto-extension? | Premium processing? |
|---|---|---|---|---|
| 5-year | LPR for 5+ years with continuous residence and physical presence | Green card copy and tax returns | N/A | No |
| 3-year (marriage) | LPR for 3+ years married to and living with U.S. citizen spouse | Marriage certificate and joint evidence | N/A | No |
| Military | Current or former U.S. military member | Military records (N-426 certification) | N/A | No |
| 1-year (military wartime) | 1 year military service during wartime | DD-214 and N-426 | N/A | No |
Strategy tips
#Mistake severity
#| Mistake type | Severity | How to avoid |
|---|---|---|
| Filing before meeting continuous residence or physical presence | Rejection | Verify you meet the 5-year (or 3-year if marriage-based) requirement before filing. |
| Failing the civics or English test | Delay | Study the 100 civics questions; request accommodations if you qualify for an exception. |
| Incorrect or incomplete biographical or travel history | RFE | List all trips outside the U.S. and ensure all addresses and employment match records. |
| Missing required photos or supporting documents | Delay | Include two passport-style photos and proof of status as required per instructions. |
Examples (What are examples for Form N-400?)
#- An applicant who has been a lawful permanent resident for 6 years, has lived in the same USCIS district for 4 months, and has demonstrated physical presence for 32 months submits a complete N-400 with all required documents, resulting in a strong application.
- A lawful permanent resident for 3 years who has traveled outside the U.S. for 8 months without proof of continuous residence submits an N-400, leading to a weak application due to unmet residency requirements.
- An applicant who has been a resident for 5 years but fails to provide the date they became a lawful permanent resident submits an N-400, resulting in a weak application due to incomplete information.
- Strong application: LPRs with 5+ years of permanent residence, 30 months physical presence, and cont submits with required evidence; receives Employment Authorization Document (EAD) in approximately 8-14 months.
- Strong application: LPRs married to and living with U.S. citizen spouse for 3+ years. Must still be submits with required evidence; receives Employment Authorization Document (EAD) in approximately 8-12 months.
- Strong application: Current or former U.S. Armed Forces members. Peacetime: 1 year service. Wartime: submits with required evidence; receives Employment Authorization Document (EAD) in approximately 5-8 months.
Common misconceptions (What misconceptions surround Form N-400?)
#- Filing this form does not guarantee approval of the underlying case
- You must meet all statutory requirements including residency, physical presence, and good moral character where applicable
Edge cases and variations
#- If you are asked to submit or update N-400, treat it as a package update: check every place the same details appear and keep them consistent.
Scenarios
#An applicant files the application with all required supporting documents and the correct fee.
Application accepted. Biometrics may be scheduled. Case proceeds to adjudication.
Follow the evidence checklist for your category. Missing documents trigger RFEs or denial.
An applicant files before the eligibility window (e.g., I-751 outside the 90 days before conditional residence expires).
Application rejected. Fee returned. Must refile when eligible.
Verify eligibility dates carefully. Filing too early is as problematic as filing late.
An applicant forgets to sign the form.
Application rejected. Must resubmit with signature. Unsigned forms are not accepted.
Sign and date the form. Review the signature block before mailing.
Key differentiators
#- Unlike Form I-485: Application to Register Permanent Residence or Adjust Status: Required for: Green card required before naturalization (Citizenship pathway)
- Unlike Form I-751: Petition to Remove Conditions on Residence: Required for: Conditions must be removed before naturalizing (Citizenship pathway)
- Unlike Form N-648: Medical Certification for Disability Exceptions: Filed together: Medical certification for disability exception if needed (Citizenship pathway)
Why it matters
#Early filing is allowed up to 90 days before meeting the continuous residence requirement.
Why it matters: Filing too early without meeting other requirements can lead to rejection or denial.
Photograph requirements differ for applicants residing outside the United States.
Why it matters: Non-compliant photos can cause delays or rejection of the application.
Translations must be certified and include the translator's contact information.
Why it matters: Incomplete translations can result in processing delays.
Conditional permanent residents must have an approved Form I-751 or Form I-829 before naturalization approval.
Why it matters: Failure to have these forms approved can delay or prevent naturalization.
Next steps
#- Receive Receipt Notice (a related form) confirming application submission.
- Attend biometrics appointment for fingerprints, photo, and signature.
- Participate in an interview and take the English and civics tests.
- Receive a decision on your application.
- Attend an oath ceremony if approved to become a U.S. citizen.
Verification
#This guide is derived from official USCIS instructions for N-400 and is updated when form editions or filing rules change. Always verify current requirements at the official USCIS website.
FAQs
What other forms are typically filed together with N-400?
Review the official N-400 instructions for your specific situation. The specific forms required vary by case type. Review the instructions for your particular immigration category to determine which forms must be submitted together.
Do I need to file N-400 if I'm only updating my address or contact information?
Check the official instructions to see which form or process applies to your type of update. Review the official N-400 instructions for complete guidance specific to your immigration case and circumstances.
Do I need to provide evidence of my spouse's U.S. citizenship?
If you are seeking naturalization through marriage, you may need to submit proof of your spouse's U.S. citizenship. For detailed instructions tailored to your specific immigration situation, consult the official N-400 guidelines.
Is it necessary to submit IRS tax transcripts?
If you have outstanding tax obligations, it is advisable to submit IRS tax transcripts.
Can a legal guardian or surrogate complete the process for me?
Consult the official instructions tailored to your specific circumstances.
Do I need to provide a mailing address for N-400?
You need a reliable mailing address for notices and card delivery. If you do not have a stable address, USCIS allows alternatives (e.g., a representative's address or safe mailing options) per official rules — review the instructions for your situation.
What happens after I submit N-400?
After submitting N-400, USCIS will issue a Confirmation of receipt confirming acceptance. You may then be scheduled for biometrics, an interview, or additional evidence requests depending on your case. You can monitor your case status online using the receipt number from your notice.
What are common reasons N-400 gets rejected?
Common reasons N-400 is rejected include missing or incorrect signatures, using an outdated form edition, incomplete required fields, incorrect fee payment, missing required supporting documents, and photographs that do not meet official specifications. Carefully review the instructions and checklist before submitting.
VisaMind provides informational guidance only and is not a government agency. This is not legal advice. Requirements can change and eligibility depends on your specific facts. If your case is complex or high-stakes, consult a licensed immigration attorney.
Next steps
Requirements vary by nationality, purpose, timeline, and case details. Use Find My Visa to get a personalized checklist with official sources and deadlines.
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