##  [Form N-400](/form-n-400-0) 

 Definition

An immigration filing instrument identified by a designated form number used to request a benefit, relief, or administrative action. It governs the data fields, attestations, and supporting documents required to initiate processing of the requested action. It does not by itself confer status, permission, or protection and is ineffective if required signatures, fees, or evidence are missing. It structures the administrative record and determines what issues are presented for adjudication. The instrument is generally stable, though form content and instructions are updated over time.



 

 

 

 

 

 





## Principle

Principle

N‑400 operationalizes the statutory pathway to naturalization by documenting claimant eligibility—such as residence and physical presence thresholds, good moral character, and attachment to the Constitution—and by triggering administrative checks and an adjudicative interview culminating in the oath of allegiance if approved.

 

 

 

 

 





## Demonstration

Demonstration

Illustrative scenario: A lawful permanent resident who satisfies a five‑year continuous residence requirement and passes English and civics testing files N‑400 with supporting residency and tax records, attends biometrics, completes an interview, and upon approval receives a naturalization ceremony date.

 

 

 

 

## Misapplication

Misapplication

Filing N‑400 before meeting residency, physical presence, or moral character requirements, failing to disclose arrests or extended absences, or using incorrect supporting documentation can lead to denial, delays, or allegations of misrepresentation.

 

 

 

 

 





## Consequence

Consequence

Properly filed and approved, N‑400 leads to issuance of a Certificate of Naturalization and confers U.S. citizenship, enabling rights such as voting and U.S. passport issuance, and altering immigration status permanently.

 

 

 

 

## Reversal

Reversal

The reversal is non‑application or denial of N‑400, leaving the individual as a permanent resident without citizenship; in other cases citizenship may be obtained through derivation (use N‑600) rather than naturalization.

 

 

 

 

 





## Boundary

Boundary

N‑400 is not for persons claiming citizenship by birth or acquisition through parents; it does not serve as a claim for derivative citizenship or as a replacement certificate (other forms apply), and different eligibility rules apply for spouses of U.S. citizens or military applicants.

 

 

 

 

 





## Semantic Tension

Semantic Tension

N‑400 is frequently conflated with N‑600 (certificate of citizenship) or with immigrant visa processes; the tension lies between procedural naturalization (N‑400) and documentary proof of preexisting citizenship (N‑600).

 

 

 

 

 





## Synthesis

Synthesis

Form N‑400 is the procedural instrument by which a lawful permanent resident documents statutory eligibility, submits to background checks and interview, and—if approved—transitions from permanent resident to naturalized U.S. citizen through the naturalization adjudication and oath.