Becoming a US citizen (naturalisation)

Becoming a US citizen through naturalization is one of the most significant decisions you can make as a permanent resident. Once you have held your green card for the required time and meet all eligibility criteria, you can apply to become a full US citizen with voting rights, a US passport, and the legal protections that come with citizenship. The path varies slightly depending on your personal circumstances, but the process itself is clearly defined and largely within your control.

The Basic Timeline: Five Years or Three

Most permanent residents must wait five years from the date shown as "Resident Since" on your green card before you can apply. However, if you are married to a US citizen, that period is reduced to three years, and you must be married to and living with that US citizen for the full three-year period.

You are allowed to file your naturalization application up to 90 days before your anniversary date arrives. For example, if your green card shows "Resident Since January 1, 2022," you could file as early as October 3, 2026. This 90-day window exists because USCIS processing times can be lengthy, and the agency wants applicants to hit their eligibility date by the time the interview and decision occur.

Continuous Residence and Physical Presence: Do Not Take Long Trips

The five-year (or three-year) requirement is not just about time on the calendar. You must also maintain continuous residence in the United States, meaning you have not abandoned your home here or spent extended time abroad. You must also satisfy a physical presence requirement: spending enough actual days inside the US during the required period.

Continuous Residence

Continuous residence means you have lived in the United States as your principal home without long absences. The rule is clear: a trip abroad lasting six months or less will not disrupt continuous residence. However, a trip of more than six months but less than one year is presumed to break your continuous residence, unless you can prove otherwise. A trip of one year or longer will almost certainly reset your continuous residence clock entirely. If that happens, you must start a new five-year (or three-year) period from the date you return to the US.

If you need to work abroad or engage in certain qualifying activities (such as working for the US government, a recognized research institution, or a religious organization), you may be able to file Form N-470 (Application to Preserve Residence for Naturalization Purposes) to maintain your continuous residence status while abroad. However, this must be filed before USCIS approves your naturalization application.

Physical Presence

Physical presence is separate from continuous residence. It refers to the actual number of days you have been inside the United States during your required period. For the standard five-year track, you must have been physically present in the US for at least 30 months of those five years. For the three-year track (married to a US citizen), you must have 18 months of physical presence during those three years.

Both the day you leave the US and the day you return count toward your physical presence. If you take a two-week vacation abroad, those 14 days (counting arrival and departure) do not count, but they also do not disrupt continuous residence. This is why understanding the difference between the two requirements matters: you could take short, frequent trips and remain eligible, but one long absence could reset everything.

The Application and Filing Process

Once you meet the residency requirement, you file Form N-400, Application for Naturalization, with US Citizenship and Immigration Services (USCIS). You can file online or by mail.

Filing Fee

As of April 2024, the filing fee is $710 if you file online or $760 if you mail a paper application. Neither of these includes a separate biometrics fee; both are included.

If your household income is at or below 150% of the federal poverty guidelines, you may request a complete fee waiver using Form I-912 (Request for Fee Waiver), and you would pay nothing. If your income is higher than 150% but not more than 400% of the federal poverty guidelines, you qualify for a reduced fee of $380; however, you must file on paper and submit supporting documentation of your income.

Biometrics Appointment

After USCIS receives your application, you will receive a notice to attend a biometrics appointment at an Application Support Center (ASC) near you. At this appointment, USCIS will take your fingerprints and photograph. The photograph may be used on your Certificate of Naturalization if you are approved.

The Naturalization Interview and Tests

Several months after filing, USCIS will schedule you for a naturalization interview at a local USCIS field office. This is not a court proceeding but a structured one-on-one conversation with a USCIS officer, typically lasting 20 to 45 minutes.

What Happens at the Interview

The officer will review your N-400 application with you directly, place you under oath, and ask questions about your background, residence, good moral character, and your application's contents. Your answers must be consistent with what you wrote on your form. Bring your green card and any requested documents.

The English Test

Unless you qualify for an exemption, you must demonstrate basic English proficiency. The test has three parts: speaking, reading, and writing.

• Speaking: The USCIS officer will ask you simple questions about your application and background during the interview itself. You must understand the questions and answer in English. The officer may repeat or rephrase questions, and you can ask for clarification.
• Reading: You must read one out of three sentences presented to you aloud and correctly. The sentences use everyday English and simple vocabulary.
• Writing: You must write one out of three sentences that the USCIS officer dictates to you. Again, the sentences are short and use common words.

The test does not require perfect grammar, native-like accent, or advanced vocabulary. USCIS understands that English is your second language and is looking for your ability to communicate in basic, everyday English. You have two opportunities to pass the entire English test: you can take it again at a second interview 60 to 90 days after your first interview if you do not pass the first time.

The Civics Test

The civics test examines your knowledge of US history and government. USCIS publishes all the questions and answers for free on its website, and you study from this same list that will be used for your test.

If you filed your Form N-400 on or after October 20, 2025, you will take the 2025 version of the test. You will be asked up to 20 questions from a pool of 128 civics questions, and you must answer at least 12 correctly to pass. If you filed before October 20, 2025, you take the 2008 version: up to 10 questions from 100, with 6 correct required to pass.

The civics test is oral: a USCIS officer asks the questions, and you answer aloud. The questions cover the US Constitution, the structure of government (the legislative, executive, and judicial branches), rights and responsibilities of citizens, and US history. Some answers vary by state—for example, questions about your US Senators or state governor will have answers specific to where you live. USCIS publishes updates to keep answers current.

Study materials are free and available on the USCIS website. Many organizations and websites offer free practice tests using the official questions, so you can familiarize yourself with the format and content before your interview.

Exemptions and Accommodations

Certain applicants qualify for exemptions from or modifications to the English and civics tests based on age and length of permanent residency. These include:

• 50/20 Rule: Age 50 or older and a permanent resident for 20+ years — exempt from the English test; may take the civics test in your native language with an interpreter.
• 55/15 Rule: Age 55 or older and a permanent resident for 15+ years — same exemptions as above.
• 65/20 Rule: Age 65 or older and a permanent resident for 20+ years — exempt from the English test and eligible for a simplified civics test (10 questions from a specially selected bank, 6 correct required to pass) in your native language.

If you have a physical or mental disability that prevents you from taking the test in the standard way, you may request reasonable accommodations or a medical waiver. Any exemption or accommodation request must be approved before your interview.

What Comes After: The Decision and Oath

After your interview and tests, USCIS will issue a decision on your naturalization application. If you are approved, you will be scheduled for a naturalization ceremony where you take the Oath of Allegiance to the United States. At that ceremony, you will receive your Certificate of Naturalization, the official proof of your US citizenship.

Once you have taken the Oath, you are a US citizen. You can apply for a US passport, vote in federal, state, and local elections, serve on a jury, and hold certain public offices. You will also receive the full legal protections and rights afforded to all US citizens.

Good Moral Character

Throughout the process, USCIS must determine that you are a person of good moral character. This is assessed based on your background, any criminal history, payment of taxes, compliance with immigration law, and overall conduct. The officer will review your N-400 application and may ask about specific concerns during the interview.

Minor traffic violations typically do not affect your eligibility. However, felonies, crimes of moral turpitude, fraud, or serious immigration violations can prevent you from naturalizing. If you have any criminal history or concerns, consult an immigration attorney before filing.

Timeline and Costs

From the time you file Form N-400 to receiving your Certificate of Naturalization, the process typically takes 8 to 12 months, though this varies by location and USCIS workload. Processing times are longer in some cities and shorter in others, so check USCIS's official processing times for your field office.

Your main costs are the filing fee ($710 online or $760 by mail, or reduced/waived if you qualify), biometrics (included in the fee), and any optional costs for legal help or translation services. You have two chances to pass the English and civics tests per application. If you fail on your first try, you will be retested 60 to 90 days later at no extra fee.

If you fail the tests a second time, your application will be denied. In that case, you would have to wait and reapply, which means filing a new N-400 and paying the fee again.

Before You File: Final Checklist

1. Check the "Resident Since" date on your green card and count forward to see when you reach five (or three) years.
2. Review your travel history for the entire residency period. Note any trips of six months or longer—these could affect your eligibility.
3. Verify you have been physically present in the US for at least 30 months (five-year track) or 18 months (three-year track) during the required period.
4. Check your state residency requirement: you must have lived in the USCIS state or district where you are filing for at least three months immediately before you file your application.
5. Gather documents proving your residency, identity, and good moral character (lease agreements, utility bills, tax returns, etc.).
6. Review your N-400 application carefully before submitting it. Make sure all answers are truthful and match the documents you submit.
7. Decide whether to file online ($710) or by mail ($760), or to request a fee waiver or reduction if you qualify.
8. Begin studying for the civics test using the official USCIS question list well in advance.

Becoming a US citizen is an important milestone. Take your time, ensure you are truly eligible, gather thorough documentation, and prepare well for the civics and English tests. USCIS provides free study materials and makes the process transparent—the information you need is publicly available on their website, so use those official resources.