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Naturalization (Form N-400): How to Apply for U.S. Citizenship

Becoming a U.S. citizen is a major milestone in an immigrant’s journey. For most lawful permanent residents (green card holders), the pathway to citizenship is through the naturalization (Form N-400) process. This application allows eligible individuals to apply for U.S. citizenship after meeting specific residency, physical presence, and moral character requirements.

In this guide, we’ll cover everything you need to know about naturalization (Form N-400), from eligibility requirements to the step-by-step application process. We’ll also briefly introduce related citizenship processes that may apply to certain individuals.

🌎 What Is Naturalization (Form N-400)?

Naturalization (Form N-400) is the legal process by which a lawful permanent resident becomes a U.S. citizen. Once naturalized, individuals gain the full rights and responsibilities of citizenship, including voting in federal elections, obtaining a U.S. passport, and sponsoring family members for immigration.

The most common path to naturalization is through Form N-400, which is submitted to U.S. Citizenship and Immigration Services (USCIS).

🔺 Naturalization (Form N-400) Eligibility Requirements”

To apply for naturalization (Form N-400), you must meet certain eligibility criteria. These vary slightly depending on your situation:

General Eligibility (5-Year Rule):

• Be at least 18 years old
• Be a lawful permanent resident for at least 5 years
• Have lived continuously in the U.S. for at least 5 years
• Be physically present in the U.S. for at least 30 months out of the 5 years
• Have good moral character (August 2025 Updates)
• Be able to speak, read, and write basic English (some exceptions apply)
• Pass a U.S. civics and history test

3-Year Rule for Spouses of U.S. Citizens:

• Be married to a U.S. citizen
• Be a permanent resident for at least 3 years
• Have lived with your U.S. citizen spouse for at least 3 years
• Meet the same physical presence, language, and civics requirements as above

Military Naturalization:

• Members and certain veterans of the U.S. Armed Forces may be eligible for expedited or waived naturalization under special laws

📆 When to File Naturalization (Form N-400)

USCIS allows applicants to file up to 90 days before reaching the required 3- or 5-year residency mark. This early filing window helps applicants avoid unnecessary delays in gaining citizenship.

📅 How to Apply for Naturalization (Form N-400)

Step 1: Prepare Your Documents

• Green card (permanent resident card)
• Marriage certificate (if applying under the 3-year rule)
• Evidence of spouse’s U.S. citizenship (if applicable)
• Tax returns and/or proof of continuous residence
• Travel records and addresses for the past 5 years

Step 2: Complete Form N-400

You can file naturalization (Form N-400) online through a USCIS account or by mailing the paper form. Take care to answer every section honestly and completely.

Step 3: Pay the Filing Fee

As of this writing, the USCIS fee for Form N-400 is $710 for online filing and $760 for paper filing (subject to change). Some applicants may qualify for a fee waiver or reduction.

Step 4: Attend Your Biometrics Appointment

USCIS will schedule an appointment to collect your fingerprints, photo, and signature for background checks.

Step 5: Complete the Naturalization Interview

You will be interviewed by a USCIS officer who will:

• Review your naturalization (Form N-400) application
• Test your English speaking, reading, and writing skills
• Administer the civics test (you must answer 6 out of 10 questions correctly)

Step 6: Receive a Decision

You may receive a decision:

• Granted: You passed and will be scheduled for the oath ceremony
• Continued: USCIS needs more documents or a second interview
• Denied: You will be told why and how to appeal or reapply

Step 7: Take the Oath of Allegiance

Once approved, you will attend a formal naturalization ceremony and take the Oath of Allegiance to officially become a U.S. citizen. You’ll then receive your Certificate of Naturalization.

🔍 Related Citizenship Options Beyond Naturalization (Form N-400)

While naturalization (Form N-400) is the most common path to citizenship, other processes may apply:

✨ Form N-600: Certificate of Citizenship

Used by individuals who acquired or derived citizenship through a parent. Not a path to citizenship but a way to obtain legal proof.

✈️ Form N-470: Preserve Residence for Naturalization

Allows green card holders who must live abroad to preserve continuous residence for future naturalization (Form N-400) eligibility.

⏳ Expedited Citizenship Under INA §319(b)

Grants spouses of U.S. citizens working abroad the ability to apply for expedited naturalization (Form N-400) without standard residence rules.

👶 Form N-600K: Citizenship for Children Living Abroad

Permits U.S. citizen parents to apply for their child’s citizenship through a temporary visit to the U.S. before age 18.

Each of these forms has its own criteria, timelines, and benefits. If you’re unsure whether naturalization (Form N-400) is right for you, a legal consultation can help determine the best option.

📢 Schedule a Consultation for Naturalization (Form N-400)

Our immigration law firm assists clients across the U.S. and abroad with naturalization (Form N-400) and other citizenship applications. Whether you’re ready to apply or just starting to explore your eligibility, we’re here to guide you.

👉 [Schedule a consultation today] and take the next step toward U.S. citizenship with expert legal support.