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N-400 Guide: How to Apply for US Citizenship

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If you seek naturalization as part of a birthright, legal status, or 14th Amendment claim, you must understand the process from start to finish. This guide outlines what steps must be taken in order to start applying for US citizenship with N-400.

The most important steps are that applicants must complete and submit Form N-400 along with supporting documentation. They must also meet requirements regarding continuous residence and physical presence, as well as knowledge of English and civics.

What is the meaning of N-400?

Check Your Eligibility for the Naturalization Process

Before you begin your application for US citizenship using Form N-400, it is crucial to determine if you meet the eligibility requirements set by USCIS. Eligibility depends on several factors, including your residency status, physical presence in the US, moral character, and other conditions.

Eligibility Criteria for Naturalization

Be at least 18 years old at the time of filing Form N-400.
Be a lawful permanent resident (green card holder) for at least 5 years, or 3 years if married to a US citizen.
Have continuous residence in the US for at least 5 years (or 3 years if married to a US citizen) before filing.
Be physically present in the US for at least 30 months within the 5 years (or 18 months within 3 years if married to a US citizen) before applying.
Have lived within the state or USCIS field office jurisdiction where you applied for at least 3 months.
Demonstrate good moral character during the statutory period.
Show an ability to read, write, and speak basic English.
Pass a civics test covering US history and government.
Be willing to take the Oath of Allegiance to the United States.
If applicable, meet military service requirements or qualify for disability exceptions with proper medical certification.
Notify USCIS of any changes in marital status, address, or other relevant information during the application process.

Gather Required Documents & Evidence

Becoming a naturalized citizen is an enormous step in your life and brings new rights, responsibilities, and an even deeper tie to America. However, certain documents will be necessary before applying. Here’s everything related to documentation and evidence gathering:

Physical Presence Requirement

Applicants must have physically lived in the US for at least half of the five-year statutory period to be eligible for naturalization. This requirement is the physical presence requirement and requires at least 30 months’ residence (approximately 913 days).

Although those applying based on marriage to U.S. citizens may meet it quickly, the N-400 form contains a chart detailing which travel days count towards meeting this criterion. Physical presence and continuous residence requirements gauge an applicant’s dedication to establishing roots and fully integrating into American society.

But these concepts should not be confused. USCIS clarifies that the definitions of physical presence and continuous residence differ, with physical presence defined as objectively measuring whether an individual has been present during a statutory period, while continuous residence looks at whether an individual maintains their residence despite any departures from the US.

English/Civics Test Requirement

Naturalization applicants must also demonstrate English proficiency during their interview and pass a civics test measuring knowledge of US history and government. USCIS offers comprehensive resources to help people prepare for this test.

In order to pass, you must answer six out of the ten questions on the standardized civics test correctly. Your immigration officer will randomly select test questions and read them out aloud before giving you time to write or phrase your answers in such a way that the officer understands them. Once this threshold has been reached, they will stop giving the exam and inform you.

Residency Requirement

Key requirements for naturalization include having been a legal permanent resident in the US for at least five years (three if married to an American citizen). Traveling can impact your ability to meet naturalization requirements.

However, in certain instances your time out of the country may still count toward naturalization requirements; for example if traveling for religious duties with a valid reentry permit and no longer than six month trips between visits could help preserve continuous residence status.

Evidence Requirement

The N-400 application requires several supporting documents to establish your identity and fulfill other eligibility criteria, so having all these materials ready before filling out the form is key to avoiding delays or rejections later in the process. These include:

Identity documents
Proof of lawful permanent resident status
Documentation supporting continuous residence and physical presence
Evidence of marital status (e.g., marriage certificate, divorce decree)
Proof of military service, if applicable
Medical certification for disability exceptions
Documentation of address history
Supporting documents for fee waiver or reduction, if applicable

How long does N-400 take?

Complete Form N-400

Candidates for naturalization must submit Form N-400, Application for Naturalization. This form can be completed either online or by mail.

Verify all information is accurate on your form. Some applicants may qualify for fee waiver or reduction; review eligibility carefully and fill out your N-400 to avoid making mistakes.

When responding to questions regarding physical address history, applicants should provide accurate addresses where they lived for most of their time in the US.

Pay the Filing Fee

Pay the Citizenship Application Fee on Form N-400 when filing electronically or using paper applications. This amount ranges between $710 for those filing online and $756.

If the filing fee is prohibitively expensive for you, based on your household income, you may qualify for a waiver or reduction based on this factor. As part of your application, you will need to present proof of income.

Does N-400 require an interview?

Attend the Biometrics Appointment

Once USCIS receives your application and supporting documents, they will schedule a biometrics appointment at an Application Support Center (ASC). The location of each ASC can be found on their receipt notice.

At their appointment, applicants for naturalization must bring valid photo identification (unless the ASC permits an alternative form of ID). Only the person applying must attend; parents or guardians may accompany children if desired.

Before attending a biometrics appointment, it’s essential to consult with an immigration attorney. Your fingerprints could reveal criminal records or issues which might make citizenship ineligible.

Receive a Decision on Your Application

As soon as your interview is over, USCIS will mail you their decision and may also notify you of a date to attend a naturalization ceremony and take the Oath of Allegiance.

Be transparent when answering each question on Form N-400 and answer fully and truthfully.
Avoid using correcting fluid or tape to hide incorrect information; USCIS’ scanning equipment will detect this and may flag it as a problem.
Citizens seeking citizenship should seek legal advice if they have concerns about their eligibility, such as failing to pay child support or taxes owed.

Legal representation will enable applicants with complex situations or arrest histories to navigate the interview process confidently and ensure they receive fair consideration from interview panels.

Take the Oath of Allegiance

Once USCIS has approved your application, they will send a notice containing information on the date and place for an Oath Ceremony where you will take an oath to defend the Constitution and immigration laws of the United States against all enemies, both domestic and foreign. At this ceremony, you will take an Oath to defend them.

USCIS may allow you to skip the oath depending on your individual circumstances; in such a situation, they require that a document from your religious organization detailing this special circumstance and attesting to your good standing within it be presented as evidence.

Before taking the Oath of Citizenship, a USCIS officer will carefully review your questionnaire on your appointment notice to make sure no answers may compromise eligibility for citizenship.

How much is the fee for N-400?

What is the minimum age to file N-400?

Conclusion

Applying for US citizenship is more than paperwork—it’s a serious commitment to your future in the United States. By carefully following the N-400 process, staying organized with your documents, and seeking legal guidance when needed, you can move forward confidently toward achieving citizenship. Mistakes and oversights can delay your dream—don’t let that happen to you.

Need Help With Your Green Card or Citizenship Journey?

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