U.S. Citizenship: The Complete Guide (2026)

What U.S. Citizenship Means

U.S. citizenship is the highest immigration status available. It grants permanent, unconditional membership in the American political community. Unlike a Green Card, which can be revoked and must be renewed, citizenship is permanent. Citizens may vote in federal and state elections, hold public office, serve on juries, petition for family members with shorter wait times, and carry a U.S. passport. Citizenship also provides protection against deportation, which Green Card holders do not have in all circumstances.

For most immigration clients, citizenship is the final destination of a journey that begins with a temporary visa, progresses to permanent residence (Green Card), and concludes with naturalization. Understanding how that final step works, what it requires, and what alternatives exist is what this guide covers.

Citizens may sponsor a broader range of family members than Green Card holders. Our Family-Based Immigration Guide covers eligibility categories and wait times.

Four Paths to U.S. Citizenship

There are four ways to become a U.S. citizen. Three are automatic or semi-automatic (based on birth or parentage). The fourth, naturalization, is the path that Green Card holders follow and the focus of this guide:

• Citizenship by birth in the U.S.: anyone born on U.S. soil (including territories such as Puerto Rico, Guam, the U.S. Virgin Islands, and the Northern Mariana Islands) is a citizen at birth under the Fourteenth Amendment. The only exception is children of accredited foreign diplomats.
• Citizenship by acquisition (born abroad to U.S. citizen parents): a child born outside the U.S. to one or both U.S. citizen parents may acquire citizenship at birth, provided the citizen parent meets specific physical presence requirements in the U.S. prior to the child’s birth. The rules differ depending on whether both parents are citizens, only one is, and whether the parents were married at the time of birth.
• Citizenship by derivation (children of naturalized parents): a child under 18 who holds a Green Card and resides in the U.S. in the custody of a parent who naturalizes automatically derives citizenship. No separate application is required.
• Naturalization: the process by which a Green Card holder applies for and obtains U.S. citizenship. This is the path relevant to most immigration clients and the core of this guide.

In short This guide covers all four paths to U.S. citizenship, with a deep focus on naturalization: eligibility requirements, the N-400 application, the citizenship test, the interview, the Oath of Allegiance, costs, timelines, dual citizenship, and common reasons for denial.

Naturalization: From Green Card to Citizenship

Who Is Eligible

Naturalization is available to lawful permanent residents (Green Card holders) who meet the following requirements:

• Age: you must be at least 18 years old at the time of filing.
• Continuous residence: you must have lived in the United States as a permanent resident for at least 5 years (3 years if married to and living with a U.S. citizen spouse). Absences of 6 months or more may break continuity. Absences exceeding 1 year generally do break it, unless you obtained a reentry permit before departing.
• Physical presence: you must have been physically present in the U.S. for at least 30 months out of the 5 years (18 months out of 3 years for spouses of U.S. citizens) immediately preceding the application.
• State residency: you must have lived in the state or USCIS district where you file for at least 3 months.
• Good moral character: you must demonstrate good moral character for the statutory period (5 or 3 years). Certain criminal convictions, fraud, or failure to pay taxes can disqualify you. USCIS evaluates this on a case-by-case basis.
• English proficiency: you must be able to read, write, and speak basic English. Exemptions exist for applicants aged 50+ with 20+ years of residence, or aged 55+ with 15+ years.
• Civics knowledge: you must pass a test on U.S. history and government (the “citizenship test”). Accommodations are available for applicants with certain disabilities.
• Attachment to the Constitution: you must be willing to support and defend the Constitution and take the Oath of Allegiance.

If you are still in the process of obtaining your Green Card through marriage, our guide on What Is the Marriage Green Card and How to Obtain It covers the I-130 to I-485 timeline.

Important The 5-year and 3-year residence rules have an early filing window: you may file Form N-400 up to 90 days before meeting the continuous residence requirement. This allows you to start the process slightly earlier, but you must meet all requirements by the time of your interview.

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The N-400 Application Process

1. File Form N-400: submit the Application for Naturalization online or by mail, along with the filing fee ($760, which includes the $710 application fee and $85 biometrics fee; fee waivers are available for qualifying low-income applicants). Include two passport-style photographs and copies of your Green Card.
2. Biometrics appointment: USCIS will schedule you for fingerprinting and a background check at a local Application Support Center (ASC). This typically occurs 2 to 4 weeks after filing.
3. Interview and tests: a USCIS officer interviews you under oath. The officer reviews your N-400 answers, asks about your background, and administers the English and civics tests during the interview. The English test evaluates reading, writing, and speaking. The civics test asks up to 10 questions from a list of 100; you must answer 6 correctly.
4. Decision: after the interview, USCIS issues one of three outcomes: approved, continued (if you failed one test and need to retake), or denied.
5. Oath of Allegiance: if approved, you attend an Oath Ceremony where you formally renounce allegiance to other countries, pledge allegiance to the United States, and receive your Certificate of Naturalization. You are a U.S. citizen from the moment you take the oath.

Critical Do not leave the United States after your interview and before taking the Oath. Extended travel between approval and the oath ceremony can create complications. Once you take the oath, you may apply for a U.S. passport immediately.

The Citizenship Test

The civics test is one of the most frequently asked-about parts of the naturalization process. USCIS provides a study guide of 100 questions covering American government, history, and civic values. During the interview, the officer asks up to 10 of these questions orally. You must answer 6 correctly to pass.

Topics covered include:

• Principles of American democracy (Constitution, Bill of Rights, rule of law)
• System of government (three branches, Congress, President, Supreme Court)
• Rights and responsibilities of citizens (voting, taxes, jury duty)
• American history (colonial period, Revolution, Civil War, civil rights movement)
• Geography and symbols (states, capital, national anthem, flag)

The English test has three components: reading (read one sentence correctly out of three), writing (write one sentence correctly out of three), and speaking (evaluated during the interview conversation itself).

If you fail either test at the interview, USCIS will schedule a second appointment 60 to 90 days later to retake only the failed portion.

For the complete question list, study strategies, and exemptions, see our guide on The U.S. Citizenship Test: Everything You Need to Know.

Citizenship by Birth and Acquisition

Born in the United States

Under the Fourteenth Amendment, anyone born on U.S. soil is a citizen at birth, regardless of the parents’ immigration status. This includes U.S. territories (Puerto Rico, Guam, the U.S. Virgin Islands, and the Northern Mariana Islands). The only exception is children born to accredited foreign diplomats who are not considered subject to U.S. jurisdiction.

Born Abroad to U.S. Citizen Parents

A child born outside the United States may acquire citizenship at birth through one or both parents, depending on the circumstances:

• Both parents are U.S. citizens and married: the child acquires citizenship if at least one parent resided in the U.S. at any point before the birth. No minimum duration is specified.
• One parent is a U.S. citizen and married to a non-citizen: the citizen parent must have been physically present in the U.S. for at least 5 years before the child’s birth, with at least 2 of those years after age 14.
• Out-of-wedlock birth to a U.S. citizen mother: the mother must have been physically present in the U.S. for at least 5 continuous years (2 after age 14) before the birth (for children born on or after June 12, 2017). For children born before that date, only 1 year of continuous presence was required.
• Out-of-wedlock birth to a U.S. citizen father: the father must meet the same physical presence requirements as married parents, plus establish paternity through legitimation, written acknowledgment under oath, or court order before the child turns 18.

Children who acquire citizenship abroad must apply for documentation (a Consular Report of Birth Abroad or a Certificate of Citizenship) to prove their status. Acquisition is not automatic documentation; the citizenship itself is automatic, but the proof must be obtained.

Derivation: Children of Naturalized Parents

Under the Child Citizenship Act of 2000, a child automatically becomes a U.S. citizen when all of the following conditions are met:

• The child has at least one U.S. citizen parent (by birth or naturalization)
• The child is under 18 years of age
• The child is a lawful permanent resident (Green Card holder)
• The child resides in the U.S. in the legal and physical custody of the citizen parent

No application is required for derivation itself, but the parent should apply for a Certificate of Citizenship (Form N-600) or a U.S. passport to document the child’s status.

Why Citizenship Matters: Benefits Over Permanent Residence

Right	Green Card Holder	U.S. Citizen
Live and work in the U.S.	Yes	Yes
Vote in elections	No	Yes
Run for public office	No	Yes (except President, unless natural-born)
Serve on a jury	No	Yes
Sponsor family members	Spouse and unmarried children only (longer waits)	Spouse, children, parents, and siblings (shorter waits)
U.S. passport	No (travel on Green Card + home passport)	Yes
Protection from deportation	Can be deported for certain crimes or fraud	Cannot be deported (except denaturalization for fraud)
Federal employment	Limited to non-security roles	Full access, including security clearance positions
Status renewal	Must renew Green Card every 10 years	Permanent; no renewal
Loss of status from long absence	Yes (abandonment risk after 1+ year)	No (citizenship is permanent)

For a deeper look at the practical differences between permanent residence and citizenship, see our guide on Permanent Resident vs. U.S. Citizen: The Essential Comparison

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Emily from Grape Law breaks down 5 fast alternatives to the Green Card Lottery, covering pathways that can get you to permanent residence and eventually citizenship.
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Dual Citizenship

The United States does not require you to renounce your existing citizenship when you naturalize. The Oath of Allegiance includes language about renouncing foreign allegiances, but the U.S. government does not enforce this against the other country’s citizenship. In practice, millions of naturalized U.S. citizens hold dual citizenship.

However, your home country’s laws determine whether you may retain your original citizenship after naturalizing in the U.S. Some countries (such as Turkey, the United Kingdom, Canada, and most EU member states) allow dual citizenship. Others (such as Japan, China, and India) do not, and naturalizing in the U.S. may result in automatic loss of your original citizenship under that country’s law.

Dual citizens should be aware of potential complications:

• Tax obligations in both countries (the U.S. taxes worldwide income regardless of where you live)
• Military service obligations in your home country
• Entering your home country on your home passport, not your U.S. passport
• Consular protection limitations when you are in the country of your other citizenship

For a comprehensive guide to dual citizenship rules, country-by-country policies, and tax implications, see our U.S. Dual Citizenship Guide.

Costs and Timeline

Fee	Amount
N-400 filing fee	$710
Biometrics fee	$85
Total	$795
Fee waiver (Form I-912)	Available for qualifying low-income applicants
Military applicants	No fee

Stage		Estimated Time
Filing to biometrics		2 to 4 weeks
Biometrics to interview		8 to 14 months (varies by field office)
Interview to oath ceremony		1 to 6 weeks (same day in some offices)
Total: filing to oath		10 to 18 months (typical)

Note on fees:

Fees reflect July 2026 figures and are subject to change. Verify current amounts at uscis.gov before filing. Attorney fees for naturalization assistance are additional.

Common Reasons Naturalization Applications Are Denied

• Criminal history: certain convictions (aggravated felonies, drug offenses, crimes involving moral turpitude) can permanently bar naturalization. Other offenses may create a temporary bar during the good moral character period.
• Failure to meet the continuous residence or physical presence requirements: extended trips abroad are the most common issue. An absence of 6+ months raises a presumption of break in continuity. An absence of 1+ year generally breaks it unless a reentry permit was obtained.
• Tax issues: failure to file federal, state, or local tax returns, or owing significant back taxes, undermines the good moral character finding.
• Failing the English or civics test: you are given two attempts. If you fail both, your application is denied, but you may refile and try again.
• Selective Service registration: male applicants aged 18-25 who did not register with the Selective Service may have difficulty demonstrating good moral character. Obtaining a Status Information Letter from the Selective Service can help.
• Fraud or misrepresentation: false statements on the N-400 or in the interview are grounds for denial and may also trigger removal proceedings.
• Abandonment of the application: failure to appear for the biometrics appointment or interview results in administrative closure.

Frequently Asked Questions

How long do I have to wait after getting my Green Card to apply for citizenship?

5 years in most cases. If you are married to and living with a U.S. citizen, the wait is 3 years. You may file up to 90 days before meeting the requirement.

Can I keep my original citizenship when I naturalize?

The U.S. does not require renunciation in practice. Whether you retain your original citizenship depends on your home country’s laws. Many countries (including Turkey, Canada, and most EU nations) allow dual citizenship. Check with your home country’s embassy.

What happens if I fail the citizenship test?

You are given a second opportunity 60 to 90 days later to retake only the portion you failed (English or civics). If you fail the second attempt, your application is denied. You may refile and start the process again.

Can I travel while my N-400 is pending?

Yes, but avoid trips longer than 6 months. Extended absences can disrupt your continuous residence and delay or jeopardize your application. Always carry your Green Card and any reentry permits when traveling.

What is the Oath of Allegiance?

The oath is the final step. You formally renounce allegiance to foreign states, pledge to support and defend the Constitution, and agree to bear arms or perform noncombatant service for the U.S. if required by law. You become a citizen the moment you complete the oath. Your Certificate of Naturalization is issued at the ceremony.

How much does the entire naturalization process cost?

The government filing fee is $795 ($710 application + $85 biometrics). Attorney fees, if you use one, are additional. Fee waivers are available for qualifying low-income applicants. Military applicants pay no fee.

Do I need a lawyer to apply for citizenship?

Not legally required. However, applicants with criminal history, extended absences, tax issues, or complicated immigration histories benefit significantly from legal guidance. An attorney can identify issues before filing that might otherwise result in denial or, worse, referral to removal proceedings.

Can my Green Card be revoked while my N-400 is pending?

Yes. Filing N-400 does not protect your Green Card. If USCIS discovers that you obtained your Green Card through fraud or that you have committed disqualifying offenses, your Green Card and your citizenship application can both be affected.

If your Green Card is approaching expiration, renew it before filing N-400. Our Green Card Renewal Guide covers the process and timeline.

What should I do if I have not lived in the U.S. continuously?

Extended absences are the most common complication. If you were absent for more than 6 months but less than 1 year, USCIS may presume a break in continuity, which you can overcome with evidence (maintained U.S. home, family, taxes, employment). If absent for more than 1 year without a reentry permit, the continuous residence clock generally restarts. Consult an attorney before filing.

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Ready to take the final step from Green Card to citizenship?
Every case is different. A Grape Law attorney will clarify whether you meet the residence and physical presence requirements, flag potential issues, and outline your timeline.
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Citizenship is the final step in the immigration journey and the only status the U.S. government cannot take away under normal circumstances. It grants rights that no visa or Green Card provides: the right to vote, the right to hold office, the right to sponsor family members without quota limitations, and permanent protection from deportation. For most Green Card holders, the path to citizenship runs through the naturalization process, and the decisions made during that process, from managing travel history to preparing for the civics test to handling the interview, determine whether the application succeeds or stalls. To evaluate whether you are ready to file, identify potential issues in your record, and build a clear timeline from N-400 to the Oath of Allegiance, reach out to the Grape Law team at info@grapelaw.com.