US citizenship application: How to fill N-400 form

By Karla Alvarez

How to fill N-400 form

Are you about to start your naturalization process? That’s great! It’s one of the best decisions you can make if you plan to live in the United States permanently. Although the process can be a bit long and complicated, it’s definitely worth it.

The first step on this journey is filling out the N-400 form. This form is essential for starting your citizenship application and plays a significant role in how long the process takes. That’s why it’s important to fill it out carefully. Any mistakes, missing information, or inconsistencies can delay your application, lead to denials, or even cause legal problems.

But don’t worry if you’re not sure where to start. We’ll walk you through the process step-by-step so you can fill out Form N-400 without stress.

What is Form N-400 and why is it so important?

Form N-400, officially called the Application for Naturalization, is the document you need to apply for US citizenship. This document collects your personal information, immigration history, residence, and employment records. It also includes details about your travel history, marital status, and other relevant information.

The N-400 form proves that you meet the requirements for US citizenship. That’s why filling it out correctly, without mistakes, and with all the required details is essential. Doing so will help you avoid delays or denials by the US Citizenship and Immigration Services (USCIS).

New version of the Form N-400 (2024)

On April 1, 2024, USCIS introduced a new version of the Form N-400 to make the process easier and more efficient. The most significant change is that the form has been shortened from 20 to 14 pages.

This new version is divided into 16 well-organized sections, making it easier to follow and complete:

Part 1: Eligibility

Part 2: Information about you

Part 3: Biographic information 

Part 4: Information about your residence

Part 5:  Information about your marital history

Part 6:  Information about your children

Part 7:  Information about your employment and schools 

Part 8: Time outside US

Part 9: Legal, threat & criminal review

Part 10: Reduced fee

Part 11: Certification & signature

Part 12: Interpreter information

Part 13: Preparer information

Part 14: Additional information

Part 15-16: Completed at interview

How to submit Form N-400

You have two options for filling out and submitting your Form N-400: online or by mail.

  • Online Submission: You must create an account on the USCIS platform. The advantage of this option is that you can complete the form at your own pace. You can also save your progress as a draft and submit it when ready.
  • Paper Submission: Download the N-400 form the USCIS website. You can either fill it out digitally and print it or by hand. Once completed, mail it to the address provided by USCIS.

No matter how you file, you must pay a filing fee. The fee is $710 if you file online, and it increases to $760 if you file by mail.

Along with the Form N-400, you must submit all required documents to the USCIS.

  • If you’re filing online, you must upload digital copies of your documents.
  • If you apply by mail, you must include photocopies of all required documents.

In some cases, USCIS may require original documents. But don’t worry – they’ll return them to you once they review them.

Tips for Filling Out Form N-400

Filling out Form N-400 correctly is key to avoiding delays or problems with your naturalization application. Even a tiny error or missing information can cause the USCIS to request more documentation, which can lengthen the process.

Here are some general tips from the USCIS to help you fill out the Form N-400 correctly:

  • Write your name exactly as it appears on your green card.
  • Include your “A-number” on each page of the form. (This is a must!)
  • Answer every question on the form:
  • Write “N/A” if a question doesn’t apply to you.
    • Use “none” if the answer is zero.
    • If you don’t know the answer to a question, explain why.
  • Be honest in answering each question.
  • Be consistent with your previous immigration applications, as the USCIS may also review them.

One of the most essential things when filling out your N-400 is to answer truthfully. If you lie or provide false information, the consequences can be severe. You could lose your chance to become a citizen now and in the future or even face criminal charges. So be very careful.

All the information you provide will be verified during your citizenship interview. A USCIS officer will ask questions about the information you provided on your form. You must answer them exactly as you wrote because the officer will check everything against your N-400. That’s why it’s so important to prepare for this moment.

Citizen Now provides examples of real questions often asked during these interviews. That way, you’ll know what to expect and how to respond with confidence. Join the hundreds of people that have used Citizen Now to become citizens. Download Citizen Now today and prepare with confidence!

A step-by-step guide about how to fill Form N-400

Filling out Form N-400 may seem complicated, but don’t worry – we’re here to walk you through the process. We’ll go step by step, section by section, to ensure you don’t miss anything and can fill it out without any mistakes.

Part 1: Eligibility for citizenship

In the first section, you must select the option that applies to your eligibility for US citizenship. Here are the choices:

  • Box A: If you’ve been a lawful permanent resident (LPR) for at least five years.
  • Box B: If you’re married to a US citizen and have been an LPR for at least three years.
  • Box C: If you received your LPR through your US citizen parent or spouse and were subjected to abuse or extreme cruelty. This allows you to apply without living together.
  • Box D: If you’re married to a US citizen working abroad for a qualifying employer.
  • Box E: If you served on active duty or in the Selected Reserve of the US Armed Forces during a specified period of hostilities.
  • Box F: If you’ve completed at least one year of honorable service in the US armed forces.

Make sure you meet the requirements for the box you select. If you check multiple boxes or none, your Form N-400 may be delayed or rejected.

Parts 2 and 3: Personal and biographical information

You must enter your full legal name exactly as it appears on your green card or birth certificate. If your name has changed due to marriage, adoption, or a court order, attach supporting documentation.

Also, list any other names you’ve used since birth, including aliases, maiden names, birth family names, assumed names, nicknames, and alternate spellings.

If you wish to change your name as part of the naturalization process, you may do so here. Just be aware that this may slightly delay your ceremony.

You’ll also be asked if you want USCIS to notify the Social Security Administration of your new citizenship. Checking “Yes” is convenient because it saves a trip to the Social Security office.

For the biographical section, you must provide physical details such as eye color, hair color, height, weight, ethnicity, and race.

Parts 4, 5, and 6: Residence, marital status, and children

List your current address and every place you’ve lived in the past five years, including exact dates. If you don’t remember a specific address or date, give your best estimate.

In the Marital History section, list your current relationship status:

  • Single
  • Married
  • Divorced
  • Widowed
  • Marriage Annulled

You’ll also need to include how many times you’ve been married and the dates your previous marriages ended. If you’re currently married, provide information about your spouse.

It’s crucial to be precise, especially if you’re applying based on marriage to a US citizen.

In the children’s section, list all your kids—biological, adopted, or stepchildren—regardless of age, immigration status, birthplace, or where they live.

Parts 7 and 8: Employment and travel abroad

You must list all jobs and schools you’ve attended in the past five years, with the exact dates for each. If you have been unemployed, retired, homemaker, or self-employed, list them as well. If you need more space, attach an additional sheet.

For the travel section of the N-400 form, you must list all trips you’ve taken outside the US in the past five years. Include each time you left the country and the dates of each trip (departure and return dates). If you don’t remember the exact dates, give a reasonable estimate.

Remember that a trip lasting six months or more may affect your permanent residency.

Part 9: Additional information

This is where the USCIS will evaluate your moral character. It’s important to answer each question honestly. If you have a criminal record or have been a member of a political group, consult an attorney before filing.

Part 10: Application for fee reduction

You may apply for a fee reduction if your family income is equal to or below 400% of the Federal Poverty Guidelines. If you’re applying for a full fee waiver, you must fill out Form I-912 along with your Form N-400.

Parts 11, 12, and 13: Contact information and signature

Provide your phone number and e-mail address. Ensure this information is accurate, as it’s the main way USCIS will contact you. While most communication will be by mail, it is crucial to have a backup phone number.

Once you finish, remember to sign your application in black ink if you send the form by mail. You’d be surprised how many forms are rejected because they’re not signed.

If someone helped you prepare or translate your application, they must fill out and sign Parts 12 and 13 of the N-400 form.

Part 14: Additional information

If you need to add any additional information, you can do so in this form section.

Parts 15 and 16: Interview and oath

Don’t complete these sections until the USCIS officer tells you to during the interview and oath ceremony.

Frequently Asked Questions about Form N-400

Where should I submit my Form N-400?

Where you send your Form N-400 depends on whether you’re filing the N-400 online or by mail. If you file online, simply upload your documents through the USCIS platform. If you prefer to mail it, check the USCIS address list.

How long does it currently take to process the N-400?

The current processing time for Form N-400 is up to 6 months. However, this may vary depending on the local USCIS office handling your case. Check out our detailed naturalization timeline guide.

What should I do if I move after filing my Form N-400?

If you change your address after filing your N-400, you must notify USCIS. You have up to 10 days after you move to do this. This is important to avoid missing important updates to your case.

Can I travel outside the US while my N-400 is being processed?

Yes, you may travel outside the US while your naturalization application is being processed, as long as you meet the Visa Waiver Program (VWP) requirements. However, your total time abroad should not exceed 90 days in 180 days. Also, ensure you do not miss any USCIS appointments, such as biometrics, citizenship exam or interview.

Summing up…

That’s all you need to know to fill out your N-400 form correctly. If you follow these tips along with the USCIS instructions, you won’t have any problems with your application. Always be honest, organized, and careful when filling out each section.

Don’t forget to download Citizen Now to practice for your citizenship interview with real questions.

And if you have any questions about your N-400 form or the naturalization process, leave them in the comments. We’re happy to help!

You’re one step closer to becoming an American citizen!

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