Becoming a U.S. citizen is one of the biggest decisions a person can make. It opens the door to voting, running for most public offices, getting a U.S. passport, sponsoring family members for green cards, and never having to worry about deportation.

But the path can feel confusing. The forms are long. The rules are detailed. And the system has changed in important ways during 2025 and 2026 — a new civics test, stricter background checks, and tighter rules around good moral character.

This guide walks you through the process in plain English. Where you start matters. Most people who want to become a U.S. citizen land in one of two scenarios — pick the one that fits you, and use the path splitter below to jump to the right section.

The Three Paths to Citizenship

There are three main ways a person becomes a U.S. citizen.

1. Birth in the United States. The Fourteenth Amendment to the U.S. Constitution says that almost everyone born on American soil is a citizen. The Supreme Court confirmed this in 1898 in United States v. Wong Kim Ark, 169 U.S. 649. Wong Kim Ark was born in San Francisco to Chinese parents. When he came back from a trip to China, the government tried to keep him out, claiming he was not a citizen. The Court ruled in his favor and made clear that birth on U.S. soil makes a person a citizen.

2. Birth abroad to a U.S. citizen parent. This is called “acquired citizenship.” The exact rules depend on when you were born and how long your citizen parent lived in the United States before your birth. People in this group often file Form N-600 to get a Certificate of Citizenship as proof. They do not need to file Form N-400 because they were already citizens at birth.

3. Naturalization. This is for people born outside the U.S. who did not get citizenship from a parent. They hold a green card, meet certain rules, and apply through Form N-400. Naturalization is the most common path, and it is the main focus of this guide.

Birthright Citizenship and the Wong Kim Ark Rule

The Fourteenth Amendment opens with a clear sentence: “All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States.”

This rule is called birthright citizenship. It has been part of American law since 1868. The Wong Kim Ark case nailed down its meaning. The Court explained that the only people not “subject to the jurisdiction” of the U.S. are children of foreign diplomats, members of an enemy invading army, and members of certain Native American tribes — and Congress fixed that last point in 1924, when all Native Americans became citizens.

If you were born in the United States, you are a citizen. You do not have to do anything special to claim it. Your birth certificate is your proof.

There has been heated public debate about birthright citizenship in recent years. Some leaders have asked Congress and the courts to narrow the rule. As of April 2026, the Wong Kim Ark rule still controls. Anyone born on U.S. soil — with the small exceptions noted above — is a citizen.

Citizenship Through a Parent

If you were born outside the U.S. but at least one of your parents was a U.S. citizen at the time of your birth, you may already be a citizen without knowing it.

The rules differ based on when you were born and whether one or both parents were citizens. For people born after November 14, 1986 with one citizen parent, the rule generally is this: the citizen parent must have lived in the United States for at least five years before the birth, and at least two of those years must have been after the parent turned 14.

If you think you may already be a citizen through a parent, you can file Form N-600 to ask USCIS to confirm it. You will get a Certificate of Citizenship if approved. This document works just as well as a naturalization certificate when applying for a passport or proving status to an employer.

There is also a rule for children who are not yet citizens. Under the Child Citizenship Act of 2000, a child under 18 who holds a green card and lives in the United States with at least one citizen parent becomes a citizen automatically when that parent naturalizes. This is called derivative citizenship. The child does not need to file an N-400.

Step Zero: How to Get a Green Card First

If you do not have a green card yet, you cannot apply for citizenship through naturalization. The N-400 application requires you to already be a lawful permanent resident (LPR) for either 5 years (general rule) or 3 years (if married to a U.S. citizen). So before you can even think about citizenship, you need to get a green card.

There are five main ways to get a green card in 2026. The right path depends on your family, your job, your home country, and your situation in the U.S.

The five main paths to a green card

Family-based green cards: the most common path

Family-based green cards split into two groups, and the difference matters a lot.

Immediate relatives of U.S. citizens. Spouses, unmarried children under 21, and parents of citizens age 21 or older. There are no annual limits in this category. Once the U.S. citizen sponsor files Form I-130 and it is approved, a visa is immediately available. If the relative is already in the U.S. lawfully, they can file Form I-485 (adjustment of status) at the same time as the I-130 — this is called “concurrent filing,” and many of these cases finish in under a year.

Family preference categories. These have annual caps, so they often involve long waits. The categories are:

• F1: Unmarried adult children (21+) of U.S. citizens.
• F2A: Spouses and unmarried children (under 21) of green card holders.
• F2B: Unmarried adult children (21+) of green card holders.
• F3: Married children of U.S. citizens.
• F4: Brothers and sisters of adult U.S. citizens.

Wait times in family preference categories vary by country. People born in Mexico and the Philippines often wait the longest — in the F4 category for siblings, the wait can be 20 years or more.

Same-sex marriages. The Supreme Court’s decisions in United States v. Windsor, 570 U.S. 744 (2013) and Obergefell v. Hodges, 576 U.S. 644 (2015) opened immigration benefits to same-sex couples on equal terms. USCIS treats valid same-sex marriages exactly the same as opposite-sex marriages for every immigration purpose.

Derivatives. When the principal applicant gets a family-preference green card, their spouse and unmarried children under 21 can usually come along as “derivative beneficiaries.” This does not apply to immediate relatives — each immediate relative needs their own I-130. But for F1 through F4 cases, derivatives can be a major reason to file early, even when wait times are long.

K-1 fiancé visa vs. CR-1/IR-1 spouse visa

If you are a U.S. citizen engaged to someone abroad, you have two options. Each leads to the same destination — a green card — but they take different routes.

Most immigration lawyers now recommend CR-1 or IR-1 (the difference is whether you have been married more than two years at the time of approval) over K-1 unless there is a strong reason to bring the partner to the U.S. quickly.

The I-864 Affidavit of Support

Almost every family-based green card requires the U.S. sponsor to file Form I-864, Affidavit of Support. The sponsor promises the federal government that they will financially support the immigrant if needed. The goal is to prevent the immigrant from becoming a “public charge” — someone dependent on government benefits.

Key rules:

• The sponsor must show income of at least 125% of the federal poverty guidelines for their household size (100% for active-duty military sponsoring a spouse or child).
• If the sponsor does not earn enough, they can use assets (typically valued at 5x the income shortfall) or add a joint sponsor who agrees to share the obligation.
• The sponsor submits their three most recent tax transcripts (free from the IRS), recent pay stubs, and proof of citizenship or LPR status.
• The I-864 is a legal contract enforceable by the immigrant, the federal government, and any state or local agency that provides means-tested public benefits to the immigrant.

The sponsor’s obligation usually ends when the immigrant naturalizes, earns 40 quarters of work credit (about 10 years of work), permanently leaves the United States, or dies. Divorce does not end the obligation. A U.S. citizen sponsor remains financially responsible for an ex-spouse until one of those events occurs.

Weak or missing I-864s are one of the most common reasons family-based cases get RFEs (Requests for Evidence) or denials. Plan early.

Employment-based green cards

If you have a U.S. employer willing to sponsor you, or you have extraordinary skills, you may qualify for an employment-based (EB) green card. The five tiers are:

• EB-1: Persons with extraordinary ability, outstanding professors and researchers, and certain multinational executives. Often does not require a labor certification.
• EB-2: Advanced-degree professionals, persons of exceptional ability, and the National Interest Waiver (NIW) for those whose work serves the national interest.
• EB-3: Skilled workers (2+ years of training), professionals with bachelor’s degrees, and certain other workers.
• EB-4: Special immigrants, including religious workers, certain juvenile court dependents, and others.
• EB-5: Investors. Minimum investment is $800,000 in a Targeted Employment Area or $1,050,000 elsewhere, and the investment must create at least 10 full-time U.S. jobs.

Most EB-2 and EB-3 cases require an extra step: PERM labor certification through the Department of Labor. The employer must prove that no U.S. worker is available to fill the role. After PERM, the employer files Form I-140. After I-140 approval, the worker files I-485 (or DS-260 if abroad) when their priority date is current.

For applicants born in India or China, the wait in EB-2 and EB-3 can stretch into many years because of per-country caps.

From H-1B to green card: the most common employment path

The H-1B is a temporary work visa for “specialty occupations” — jobs that require at least a bachelor’s degree in a specific field. It is the path most international tech, finance, and healthcare workers use to come to the U.S.

H-1B is a “dual intent” visa, which means H-1B workers are allowed to pursue permanent residence without violating their visa terms. This is critical — most other temporary visas would not allow it.

The typical H-1B to green card path:

1. Employer registers worker for the H-1B lottery (in March each year). Selected workers can start work on October 1.
2. While on H-1B, the employer files a PERM labor certification with the Department of Labor, proving no qualified U.S. worker is available for the role.
3. After PERM approval, the employer files Form I-140, Immigrant Petition for Alien Worker.
4. When the worker’s priority date is current in the Visa Bulletin, they file I-485 (or DS-260 if abroad).

AC21 portability. Under the American Competitiveness in the 21st Century Act of 2000, an H-1B worker can change jobs once their I-485 has been pending for at least 180 days, as long as the new job is in the “same or similar” occupation. This protection matters because the I-485 wait can run many years for workers from India and China — and in that time, careers change.

The H-1B visa itself is normally limited to 6 years, but workers with an approved I-140 or a pending PERM application of 365 days or more can extend H-1B status indefinitely under sections 104(c) and 106(a) of AC21. This is what keeps Indian and Chinese workers in legal status during long green card waits.

F-1 students and OPT

International students on F-1 visas have their own path. After graduation, F-1 holders can work on Optional Practical Training (OPT) for 12 months. Students with degrees in science, technology, engineering, or math (STEM) can extend OPT for an additional 24 months — up to 36 months total.

During OPT, most students aim to win an H-1B in the lottery, then transition to the H-1B to green card pathway above. The math is tough: H-1B selection rates have hovered around 25-30% in recent years. Students who do not win the lottery often pivot to other paths — marriage to a U.S. citizen, employment-based green cards through extraordinary ability (EB-1A), the National Interest Waiver (EB-2 NIW), or relocating to a country with friendlier work-visa rules.

Asylum and refugee paths

If you fear persecution in your home country based on race, religion, nationality, political opinion, or membership in a particular social group, you may qualify for asylum. The Supreme Court interpreted the asylum standard in INS v. Cardoza-Fonseca, 480 U.S. 421 (1987), holding that asylum requires only a “well-founded fear” of persecution — a lower standard than the “clear probability” required for withholding of removal.

Apply for asylum using Form I-589. There is one critical deadline: you must file within ONE YEAR of your last arrival in the U.S., with limited exceptions for changed or extraordinary circumstances. Missing the one-year deadline is one of the most common case-killers in asylum law. Save your I-94 record, plane tickets, and any other proof of when you arrived.

After asylum is granted:

• You can work immediately — no separate work permit needed. (Asylum applicants can apply for a work permit 150 days after filing I-589.)
• After one year of physical presence as an asylee, file Form I-485 for a green card.
• Your spouse and unmarried children under 21 can “follow to join” you using Form I-730, even if they are still abroad.
• Five years after green card approval, file Form N-400 for citizenship.

Refugees are processed and admitted from outside the U.S. through the U.S. Refugee Admissions Program. After one year of physical presence as a refugee, they too apply for a green card with Form I-485. Refugee status is granted before arrival; asylum is granted after arrival.

The Diversity Visa lottery

The Diversity Visa (DV) program makes about 51,600 immigrant visas available each year to natives of countries with low U.S. immigration rates. Selection is random, by computer, from millions of applicants worldwide. Fewer than 1 in 400 applicants is selected.

Key facts about the DV lottery:

• The application window each year runs from early October through early November.
• You apply free on the official Department of State website (dvprogram.state.gov). Beware of scam websites that charge fees.
• You must be a native of a qualifying country. For DV-2026, large source countries like Mexico, India, China, Bangladesh, Pakistan, the Philippines, Brazil, Vietnam, Nigeria, Canada, and others were excluded.
• You must have at least a high school education or two years of work experience in a qualifying occupation.
• If selected, you file Form DS-260 if abroad or Form I-485 if already in the U.S. legally. The whole process must finish by September 30 of the program’s fiscal year.

VAWA, U/T visas, and other special programs

Several pathways protect specific vulnerable groups. These cases are technical and almost always require a lawyer or accredited representative.

• VAWA self-petition. Despite the name, the Violence Against Women Act protects survivors of any gender who were abused by a U.S. citizen or LPR spouse, parent, or child. The survivor files Form I-360 to self-petition without the abuser’s knowledge or consent. USCIS keeps the case confidential.
• U visa. For victims of certain serious crimes — domestic violence, sexual assault, human trafficking, kidnapping, and others — who help law enforcement investigate or prosecute. Requires a certification (Form I-918, Supplement B) from a law enforcement agency. The annual cap of 10,000 U visas creates long backlogs.
• T visa. For victims of severe forms of human trafficking who help with investigation and prosecution. Capped at 5,000 per year. After 3 years on a T visa (or earlier in some cases), the holder can apply for a green card.
• Special Immigrant Juvenile (SIJ) status. For children under 21 who have been abused, neglected, or abandoned by one or both parents and have an order from a state juvenile court. Often the path to lawful status for unaccompanied minors.
• Cuban Adjustment Act of 1966. Cuban nationals who have been physically present in the U.S. for one year may apply directly for adjustment of status without a separate immigrant petition.

DACA recipients. Deferred Action for Childhood Arrivals provides temporary protection from deportation and a work permit, but it is NOT a green card and does NOT lead directly to citizenship. DACA recipients who marry a U.S. citizen or qualify through another path can sometimes adjust status — but they often hit the unlawful presence bars discussed in the “Landmines” section below. DACA cases are some of the most legally complex in immigration. Always work with a lawyer.

What documents you actually need

Most green card cases require a thick stack of paperwork from your home country. Plan for these well before you file.

• Civil documents. Birth certificates, marriage certificates, divorce decrees, and death certificates of any prior spouses. Some countries do not issue all of these — check the State Department’s reciprocity table at travel.state.gov.
• Apostilles or authentications. Many consulates require an apostille — a special certification under the 1961 Hague Convention — on civil documents. If your country is not part of the Hague Convention, the document needs full diplomatic authentication, which takes longer.
• Police certificates. You need a police certificate from every country where you lived for 6 months or more after age 16. Some countries are slow to issue these — start early.
• Certified translations. Anything not in English must come with a certified English translation. The translator signs a statement that they are competent and the translation is complete and accurate. Translations cost roughly $20–$50 per page from professional services.
• Medical exam (Form I-693). Done by a USCIS-approved “civil surgeon.” The doctor seals the form in an envelope you submit unopened (or upload, if filing online). Costs $200–$500.

Travel during a pending I-485

If you have an I-485 pending and you leave the U.S. without permission, USCIS will treat your application as abandoned. Your case is dead. The fix is Advance Parole (Form I-131). File it with your I-485 — most concurrent filers do — and you will receive a travel document that lets you re-enter while your case is pending.

Two important exceptions:

• H-1B and L-1 holders can travel on their underlying work visa while the I-485 is pending without separate Advance Parole. They are exempt from the abandonment rule.
• Asylees and refugees with pending I-485s should generally not travel to the country of feared persecution. Doing so can be treated as evidence the fear was not well-founded, undermining the asylum claim and the green card application.

The two ways to file: Adjustment of Status vs. Consular Processing

No matter which green card path you qualify for, the actual application happens in one of two ways. The right one depends on where you are.

The Visa Bulletin and priority dates

For categories with annual caps (every family preference category and most employment categories), you cannot file the final green card application until your “priority date” is current.

Your priority date is usually the date the underlying petition (I-130 or I-140) was filed. The Department of State publishes a monthly Visa Bulletin that lists cut-off dates for each category and country. If your priority date is earlier than the cut-off, your category is “current” for that month, and you can move forward. If not, you wait.

For some categories, the wait is short. For others — like F4 (siblings) for Mexico and the Philippines, or EB-2/EB-3 for India — the wait can be a decade or more. Check the current Visa Bulletin at travel.state.gov before you assume your case will move quickly.

What it costs in 2026

A typical family-based adjustment of status case — I-130 + I-485 + medical — runs about $2,300 in government and medical fees, not counting any attorney costs. Employment-based cases often have higher costs, much of which is paid by the sponsoring employer.

How long it really takes

Honest timelines, based on early 2026 USCIS data:

• Spouse of a U.S. citizen, already in the U.S.: 8 to 14 months for the green card.
• Spouse of a green card holder: 1 to 3 years.
• Sibling of a U.S. citizen (F4): 10 to 25+ years, depending on country.
• Employment-based EB-2/EB-3, India: Many years, sometimes a decade or more.
• Asylum: 1+ year as an asylee, then file I-485, then 8–14 months for the green card.
• DV lottery winner: Must finish within the fiscal year of selection.

Once you have your green card

The clock to citizenship starts the day you become a lawful permanent resident. After 5 years (or 3 years if you got your green card through marriage to a U.S. citizen and are still married to them), you can file Form N-400 and follow the rest of this guide. Spend those years carefully — keep clean tax records, avoid long trips abroad, and stay out of legal trouble. The same period that earns you the right to apply also gets reviewed for good moral character.

Three Landmines That Block More Cases Than Anything Else

Before you file anything, know these three issues. They block more green card and naturalization cases than every other problem combined. If any of them might apply to you, talk to an immigration lawyer before you submit your application. Filing first and asking later is how easy cases turn into permanent problems.

Conditional Residence and Form I-751

If you got your green card through marriage to a U.S. citizen and you had been married less than two years at the time the green card was approved, you received a conditional green card valid for only 2 years. Before it expires, you must file Form I-751, Petition to Remove Conditions on Residence.

The filing window is the 90 days before the card expires. File too early and USCIS rejects it. Miss the window entirely and your status terminates — you fall into removal proceedings.

Joint filing. The standard I-751 is filed jointly with your U.S. citizen spouse. You include evidence the marriage was real:

• Joint bank statements, credit card accounts, and tax returns filed jointly
• Joint lease, mortgage, or deed
• Joint insurance policies (health, auto, life)
• Photos together over time
• Children’s birth certificates listing both parents
• Sworn statements from people who know you both

USCIS may schedule both spouses for an interview. They may also ask each spouse the same set of questions separately to test consistency — the so-called Stokes interview, named after a 1975 case that established the procedure.

If your marriage has ended. You can still file I-751 alone, with a waiver of the joint-filing requirement, in three situations:

• The marriage was real but ended in good-faith divorce or annulment
• You were battered or subjected to extreme cruelty by your U.S. citizen spouse
• Removal from the U.S. would result in extreme hardship

Timing with naturalization. The I-751 process can take 12 to 24 months or more. While it is pending, USCIS issues a Form I-797 receipt that extends your green card for up to 4 years. You can travel and work on this extension. You can file N-400 while your I-751 is still pending, but USCIS will not approve the naturalization until the I-751 is approved. In recent years, USCIS has often interviewed both at the same combined interview to save time.

Naturalization: How to Become a U.S. Citizen

Naturalization is the legal process of becoming a U.S. citizen after birth. The Immigration and Nationality Act (INA) sets the rules, and U.S. Citizenship and Immigration Services (USCIS) — an agency within the Department of Homeland Security (DHS) — runs the process. Citizenship gives you the full bundle of constitutional rights, including the right to vote and the right to participate in debates about presidential power and constitutional limits as a member of the political community.

To naturalize, you file Form N-400, attend a biometrics appointment, pass an interview, take an English and civics test, and swear the Oath of Allegiance.

Who Can Apply

To file Form N-400 under the general five-year rule, you must:

• Be at least 18 years old.
• Be a green card holder (lawful permanent resident, or LPR) for at least five years.
• Have lived continuously in the U.S. during those five years.
• Have been physically present in the U.S. for at least 30 months — that is, 913 days — during those five years.
• Have lived in the state or USCIS district where you apply for at least three months.
• Be a person of good moral character.
• Read, write, and speak basic English.
• Know basic U.S. history and government (civics).
• Show attachment to the principles of the U.S. Constitution.
• Be willing to take the Oath of Allegiance.

If you are married to a U.S. citizen and have lived with that spouse during all three years of marriage, you can apply after only three years as a green card holder. You still need 18 months — 548 days — of physical presence. The marriage must be real. USCIS does not approve fake marriages, and the consequences for marriage fraud are serious.

You can file your N-400 up to 90 days before you reach the five-year or three-year mark. This is called the “early filing rule.” It can save several months of waiting. USCIS provides a free calculator on its website to help you find your earliest possible filing date.

Continuous Residence and Physical Presence

These two rules sound the same, but they are different — and people lose cases by mixing them up.

Continuous residence means you treated the United States as your home during the whole period. Long trips abroad can break it. A trip of more than six months but less than a year creates a presumption that you broke continuous residence; you can rebut that presumption with evidence (kept your job, kept your home, kept paying U.S. taxes). A trip of one year or more breaks continuous residence outright, unless you filed Form N-470 before leaving for certain qualifying jobs.

Physical presence is a simple count of days. You add up every day you were inside the U.S. during the period. The threshold is 913 days for the five-year path or 548 days for the three-year path.

A real-world example helps. Imagine someone on the five-year path who takes two two-week vacations abroad each year, plus a few short business trips. That can add up to 50 or more days outside the U.S. each year. Over five years, that is 250 days — well within the limit. But someone who spends four months a year abroad would fall short on physical presence, even if no single trip broke continuous residence.

Keep careful travel records. USCIS officers ask about every trip outside the U.S. during the period. Save your boarding passes, passport stamps, and travel confirmations. If you fly often, request your travel history from U.S. Customs and Border Protection through the I-94 website.

Good Moral Character — and Why Maslenjak Matters

USCIS must find that you are a person of good moral character (GMC) before your application can be approved. The law lists certain things that automatically block GMC during the statutory period — recent murder convictions, fraud, illegal voting, smuggling people into the country, and more. Other issues, like a DUI, tax problems, or unpaid child support, are weighed case by case. For a deeper look at how criminal records are evaluated, see the Landmines section above — the rules for naturalization mirror the rules for green cards.

In August 2025, USCIS issued Policy Memo PM-602-0188. The memo told officers to use a “totality of the circumstances” approach. That means officers should look at the whole picture — both negative and positive — rather than just check for the absence of bad behavior. They are now told to look for active contributions to the community, not just a clean record.

In April 2026, USCIS made tax compliance a top factor in this review. Officers now look at IRS transcripts and check whether you filed returns for the full statutory period (the 5 or 3 years before applying). Filing taxes consistently helps your case. Missing returns, or filing as a non-resident while holding a green card, raises serious questions.

The Supreme Court has been clear that citizenship is too important to be lost over small mistakes. In Maslenjak v. United States, 582 U.S. 335 (2017), the Court held that the government cannot strip citizenship for a lie unless the lie was “material” — meaning it actually affected the decision to grant citizenship. Justice Elena Kagan, writing for the Court, explained that small omissions and minor lies should not strip a person of U.S. citizenship.

A lie told in the naturalization process — even out of embarrassment, fear, or a desire for privacy — would always provide a basis for rescinding citizenship. The Government could thus take away on one day what it was required to give the day before. — Justice Kagan, Maslenjak v. United States

The Maslenjak rule matters at the front end too. While the case dealt with denaturalization (taking citizenship away after the fact), its logic reminds officers that the law is meant to keep dishonest people out, not to punish honest mistakes. Even so, you must answer every question on Form N-400 truthfully. Lying about even a minor matter creates problems that can take years to fix.

The high bar for taking citizenship away goes back further to Schneiderman v. United States, 320 U.S. 118 (1943). The Court there required “clear, convincing, and unequivocal evidence which does not leave the issue in doubt” before citizenship can be revoked. That standard still controls today.

The cases that protect naturalized citizens

The English and Civics Tests

You must take two short tests at your interview. One checks your English skills. The other checks your knowledge of U.S. history and government.

The English test

The officer will ask you simple questions in English about your application. You must understand and reply. You will then read one of three sentences out loud and write one of three sentences. The sentences focus on civics and history words. USCIS publishes the full vocabulary lists for free on its website.

The civics test — old vs. new

Which civics test you take depends on when you filed your N-400.

If you filed before October 20, 2025, you take the 2008 test. The officer asks up to 10 questions from a pool of 100. You need 6 right to pass.

If you filed on or after October 20, 2025, you take the 2025 test. This new version was rolled out under Executive Order 14161. The officer asks 20 questions from a pool of 128. You need 12 right to pass.

The 2025 test is based on the 2020 test from the first Trump administration, with some updates. About 75% of the questions are the same as the 2020 version. The new test focuses more on history and government and less on geography. It also includes some reworded questions about the Fourteenth Amendment and birthright citizenship.

Both tests are oral. The officer reads questions aloud and writes down your spoken answers. USCIS offers free study guides and a study app on its website. Many local libraries and nonprofit groups also run free citizenship classes.

Exceptions for older applicants and people with disabilities

• The 65/20 rule. If you are 65 or older and have been a green card holder for 20 or more years, you take a shorter civics test (10 questions from a special list of 20) and you can take it in your native language.
• The 50/20 and 55/15 rules. If you are 50 or older and an LPR for 20 years, or 55 or older and an LPR for 15 years, you can take the civics test in your native language and skip the English test.
• Form N-648. If you have a serious medical or developmental condition, a doctor can fill out Form N-648 to ask for a waiver of the English and civics requirements.

How to Apply for Citizenship: The N-400 Application Process, Step by Step

The Interview

The interview is the heart of the process. A USCIS officer goes through your N-400 with you, asks questions to confirm your answers, gives you the English and civics tests, and decides whether to approve your application.

Here is what helps:

• Bring every document USCIS asked for. The appointment notice lists what to bring.
• Tell the truth. If you spot a mistake on the form, fix it at the interview. Officers expect minor corrections — they do not expect lies.
• Dress neatly. The photo on your Certificate of Naturalization may come from this appointment.
• Stay calm. Officers are trained to be fair, even when they ask tough questions.
• Bring an interpreter only if you qualify for an English-test exception.

Most interviews take 20 to 40 minutes. The officer will tell you on the spot whether you passed both tests. You may also learn whether your case is approved, denied, or continued for more review.

If your case is approved, you may take the Oath of Allegiance the same day at some offices. Most people get a separate notice (Form N-445) for a ceremony within a few weeks.

A note on Stokes interviews. If USCIS suspects a marriage-based case is fraudulent, they may schedule a “Stokes interview” — separate questioning of each spouse on small details of daily life. The technique is named after a 1975 case that established the procedure. Real spouses sometimes fail Stokes interviews because they get nervous or remember small details differently. Practice answering routine questions about life together — what side of the bed each of you sleeps on, what brand of toothpaste you use, what you ate for dinner last night — but never coach false answers. Honesty even about uncomfortable details (an argument, a separation, a different version of an event) is far better than getting caught in inconsistencies.

The Oath of Allegiance

The Oath of Allegiance is the moment you become a citizen. Until you take it, you are still a green card holder, no matter how many other steps you have completed.

In the oath, you promise to:

• Support the Constitution and laws of the United States.
• Renounce any prior allegiance to other countries.
• Defend the country, in arms or in non-combat service, when required by law.
• Serve in civilian work of national importance when required.

After the oath, you turn in your green card and receive a Certificate of Naturalization. With this certificate, you can apply for a U.S. passport and register to vote that same day. Many ceremonies have voter registration tables right outside the hall.

Special Pathways: Military, Marriage, and Children

The general rules above are not the only road to citizenship.

Military service. People who serve honorably in the U.S. armed forces can naturalize on faster terms. Active-duty members during certain periods of conflict (declared by executive order under INA § 329) can apply with no minimum residence period at all. Peacetime service members can apply after just one year of honorable service under INA § 328. There is no filing fee for military applicants.

Marriage to a U.S. citizen. As mentioned, the wait is three years instead of five. The marriage must be valid under the law of the place where it was celebrated, the spouses must live together, and the citizen spouse must have been a citizen for the full three years.

Children. Children under 18 who are green card holders living in the U.S. with a citizen parent become citizens automatically when the parent naturalizes, or when they themselves are admitted as a green card holder if the parent is already a citizen. The Supreme Court explained in INS v. Pangilinan, 486 U.S. 875 (1988), that citizenship is granted only by Congress through statute, so courts will not create new pathways outside what the law allows. That is why following the right route — N-400 vs. N-600 vs. derivative — matters so much.

When Things Go Wrong: RFEs, Denials, and Court Review

Most cases do not sail through. Knowing what each kind of bad news means — and how to respond — is the difference between a fixable setback and a destroyed case.

Requests for Evidence (RFEs)

An RFE is USCIS’s way of saying “we need more before we can decide.” You typically have 87 days to respond. Common RFE triggers:

• Missing or unclear supporting documents
• Inconsistencies between your application and your evidence
• Insufficient proof of a real marriage in family-based cases (joint accounts, lease, photos)
• Unclear job duties or qualifications in employment cases
• Tax issues — missing returns, mismatched filing status, or unexplained income

A weak RFE response can sink a case that was otherwise winnable. Read the RFE carefully. Address every point the officer raised. Submit organized, indexed evidence with a cover letter that walks the reader through what you provided. Many lawyers will handle a single RFE response on a flat fee, even if they did not file the original case. If you got an RFE on a complicated issue, paying for a few hours of legal review is almost always worth it.

Notice of Intent to Deny (NOID)

A NOID is more serious than an RFE. It means USCIS is leaning toward denying your case and is giving you one last chance — usually 30 days — to convince them otherwise. The notice spells out exactly why USCIS is leaning toward denial.

Treat a NOID as an emergency. Do not respond without legal help. The arguments you make in your NOID response often become the record on appeal, so a sloppy answer can hurt you twice.

Denials and the N-336 hearing

If your N-400 is denied, you can request a hearing before a different USCIS officer using Form N-336 within 30 days of the denial. Many denials are reversed at this stage when applicants explain or correct the issue. The hearing is in person at the field office, and you can bring a lawyer.

If your green card application (I-485) is denied, the appeal route is different. There is generally no direct appeal of an I-485 denial to the Administrative Appeals Office. The usual options are to refile if circumstances have changed, to renew the application in removal proceedings (if removal proceedings begin), or in some cases to seek federal court review.

Federal court review of naturalization denials

If your N-336 hearing fails, you can sue in federal district court under 8 U.S.C. § 1421(c). This is one of the strongest review rights in all of immigration law. The federal court reviews your case de novo — that is, completely fresh, with no deference to the USCIS decision. You are entitled to a new hearing on the facts, and a federal judge can order USCIS to grant your citizenship.

You can also bring a witness, present evidence, and have full discovery. For people whose cases were denied for reasons that USCIS misread or misunderstood, federal court review is often the path that finally works.

Mandamus actions for stuck cases

If your case has been pending far longer than normal processing times — many months past the high end of USCIS’s posted estimate — you can file a writ of mandamus in federal court. A mandamus action asks the judge to order USCIS to make a decision, one way or the other.

Mandamus does NOT force USCIS to grant your case — only to decide it. But most stuck cases settle within weeks of the lawsuit being filed because USCIS does not want to litigate. The usual outcome is an interview scheduled or a long-pending case adjudicated. Filing fees for federal court are around $400, and most immigration lawyers handle mandamus on a flat fee of $3,000-$5,000.

Common Mistakes That Delay or Deny Cases

Avoid these common pitfalls.

1. Using an old version of Form N-400. USCIS rejects outdated forms. Always download the current version from uscis.gov.
2. Missing trips outside the U.S. The form asks for every trip — even short ones — during the period. Forgetting trips makes officers question your honesty.
3. Unfiled or unpaid taxes. The April 2026 USCIS guidance treats tax compliance as a top sign of good moral character. File any missing returns and set up an IRS payment plan before applying. Filing Form 1040-NR while holding a green card can be read as abandoning your LPR status.
4. Saying “no” to a question that should be “yes.” If you have ever been arrested, even for something dismissed or expunged, you must say so. Hiding it is far worse than disclosing it. Maslenjak protects against denaturalization for trivial lies, but it does not protect you from a denied application during the review.
5. Filing too early. The 90-day early-filing rule helps, but filing one day too early leads to denial. Use the USCIS early-filing calculator.
6. Failing to register for Selective Service. Men who lived in the U.S. as something other than a lawful nonimmigrant between ages 18 and 26 must have registered. If you missed it, request a Status Information Letter from the Selective Service System (1-847-688-6888) and explain the situation.
7. Marriage paper-trail problems. If you are filing through a U.S. citizen spouse and you file taxes as Single or Head of Household instead of Married, USCIS may treat that as a fraud red flag.
8. Not following pending immigration legislation. Immigration rules change with new legislation and policy memos. Track active immigration bills in Congress and policy changes that may affect your timeline.

Getting Help: How to Find an Immigration Lawyer

Not every case needs a lawyer. A clean naturalization for a long-time green card holder with no criminal history, no tax issues, no long absences, and no contested marriage history can be a do-it-yourself project. USCIS provides every form for free, and the instructions are good.

But complex cases — past arrests of any kind, long absences from the U.S., unlawful presence, prior immigration denials, marriage-based filings where the marriage has had any complication, employment-based cases of any kind, and asylum — almost always benefit from professional help. Mistakes in immigration are expensive: a denied case usually means re-filing, re-paying fees, and waiting another year or more.

Where to look

• AILA (American Immigration Lawyers Association). The professional association of U.S. immigration lawyers. Their referral service at ailalawyer.com matches you with vetted members in your area. AILA membership is voluntary, but most serious immigration practitioners belong.
• DOJ-recognized accredited representatives. The Department of Justice authorizes certain non-lawyers, working at recognized nonprofit organizations, to represent immigrants for low fees or free. The full list is at justice.gov/eoir/recognition-and-accreditation-program.
• Local nonprofits. Catholic Charities, Lutheran Immigration and Refugee Service (LIRS), Hebrew Immigrant Aid Society (HIAS), International Rescue Committee (IRC), and many state-specific groups offer low-cost or free immigration help.
• Law school clinics. Many U.S. law schools run immigration clinics that handle real cases under faculty supervision. They are free or low-cost and often handle cases other lawyers will not take.
• Pro bono panels. Most major bar associations run pro bono programs that take cases for vulnerable clients — asylum seekers, abuse survivors, detained immigrants, unaccompanied minors.
• State bar referral services. Most state bars run lawyer referral services that match you with attorneys for low-cost initial consultations (often $30-$50 for 30 minutes).

Red flags to avoid

Immigration is one of the most-scammed areas of law in the United States. Watch out for:

• Anyone who guarantees a result. No honest lawyer guarantees outcomes.
• Anyone who asks for cash only or refuses to give you a written contract.
• Anyone who calls themselves a “notario” or “notary public” and offers immigration help. In many Latin American countries, “notario” means lawyer. In the United States, it does not. Notarios offering immigration help are usually committing the unauthorized practice of law — a crime in most states — and they cause enormous damage.
• Anyone who pressures you to sign blank forms or papers in English you cannot read.
• Anyone who tells you to lie on your application. Even if it “works” short term, it can mean denaturalization or removal years later.
• Anyone who promises you a special program, an amnesty, or a path that you cannot independently verify on uscis.gov or travel.state.gov.

If something goes wrong with a person who promised to help, you can report them to your state attorney general, the FTC at reportfraud.ftc.gov, and the state bar (for actual lawyers). The damage often cannot be fully undone, but reporting helps protect the next person.

Frequently Asked Questions