How Naturalization Works, From Green Card to Oath Ceremony

The first rule the new nation wrote about who could join it fit on a single page. Signed by George Washington on March 26, 1790, the Naturalization Act said that any alien who was a "free white person" and had lived in the United States for two years could become a citizen, provided a court found them of good character and they swore to support the Constitution. Two years and a clean name. It was a remarkably open door for anyone it counted as white, and a locked one for everyone else: enslaved people, free Black residents born abroad, Asian immigrants, and, in practice, many Native Americans. It took a Civil War for Congress to open naturalization to people of African descent in 1870, and it was not until the McCarran-Walter Act of 1952 that race was finally removed as a bar to naturalization altogether. The process you face today is longer, more expensive and more paperwork-heavy than the one-page law of 1790. It is also, for the first time in the country's history, open on the same terms to people of every race and origin. Here is how it works.

In short: Most green card holders can apply for citizenship after five years, or three if married to and living with a U.S. citizen, by filing Form N-400 with U.S. Citizenship and Immigration Services. The process runs through fingerprints, an interview with English and civics tests, and an oath ceremony. This guide walks through each step; it is general information, not legal advice, and anyone with a complicated history should talk to an accredited expert first.

The long road from "free white persons"

Before the steps, a word about why this matters beyond paperwork. For more than a century and a half, the United States decided who could become a citizen partly by race. The Supreme Court upheld those limits more than once, including in 1922 and 1923 cases that held Japanese and Indian immigrants could not qualify as "white." Women's citizenship for a time depended on whom they married. Each of these rules was eventually changed by Congress, usually after years of organizing by the people they excluded.

The present system still has real barriers: fees, backlogs, a test some people fear, and the cost of a lawyer when a history is complicated. Millions of green card holders are eligible to naturalize and have not. Some do not know they qualify. Some cannot afford the fee. Some are afraid that applying will draw scrutiny to an old arrest or a long trip abroad. Those fears are sometimes justified, which is why getting a qualified opinion before filing is the single most important step for anyone with a question mark in their past.

Step 1: Check whether you are eligible

The core requirements, as U.S. Citizenship and Immigration Services describes them, are these. Check each one against your own dates.

1. Age. You must be at least 18 when you file.
2. Permanent residence. You must be a lawful permanent resident (a green card holder) for at least five years, or at least three years if you have been married to and living with the same U.S. citizen spouse for those three years and your spouse has been a citizen for that whole time.
3. Continuous residence. You must have lived in the U.S. continuously for that five- or three-year period. A trip abroad of more than six months but less than a year may be treated as breaking continuous residence unless you can show otherwise; a trip of a year or more generally breaks it.
4. Physical presence. You must have been physically in the U.S. for at least half of the period: 30 months out of five years, or 18 months out of three.
5. Local residence. You must have lived for at least three months in the state or USCIS district where you file.
6. Good moral character. Generally judged over the statutory period, though officers can look further back. Certain crimes are permanent bars; others are temporary bars; failing to pay taxes or child support, or lying to immigration officials, can count against you.
7. English. You must be able to read, write and speak basic English, unless an exemption applies (see Step 5).
8. Civics. You must pass a test on U.S. history and government, unless an exemption applies.
9. Attachment to the Constitution. You must be willing to take the Oath of Allegiance.

Special rules exist for current and former members of the U.S. military, for some spouses of citizens working abroad, and for children. Children under 18 who are green card holders living in the legal and physical custody of a citizen parent often become citizens automatically under the Child Citizenship Act of 2000, without filing an N-400; they can document that status with a separate form, the N-600.

Do not file yet if you have ever been arrested or cited for anything beyond a minor traffic ticket, have spent long periods abroad, have claimed to be a U.S. citizen, have voted in a U.S. election before becoming a citizen, or have any doubt about how you got your green card. Those situations can lead to denial and, in some cases, to removal proceedings. Get advice first.

Step 2: Gather documents and file Form N-400

The application is Form N-400, Application for Naturalization. You can file it online through a USCIS account or on paper by mail. You may file up to 90 days before you reach the three- or five-year mark; USCIS offers an early-filing calculator on its website.

The filing fee in 2024 became $760 for a paper filing or $710 online, including biometrics. A reduced fee is available for households within certain income limits, and a fee waiver is available to people who receive means-tested benefits, have low incomes or face financial hardship, using Form I-912. Check the current USCIS fee schedule before you pay; fees change.

Documents most applicants need:

1. A copy of the front and back of your green card.
2. Your travel history for the statutory period: dates you left and returned. Passport stamps and airline records help.
3. Your addresses and employers or schools for the past five years.
4. Marriage and divorce records, if you are filing on the three-year marriage basis or have been married before, and proof your spouse has been a citizen for three years.
5. Records of any arrest, citation or court case, with final dispositions, even if the case was dismissed or sealed.
6. Proof of tax filing, and of child support if it applies.

Answer every question truthfully and completely. The N-400 asks many yes-or-no questions about past conduct. A false answer, even about something minor, can be treated as lack of good moral character. When you are unsure how to answer, that is a question for a lawyer or accredited representative, not a guess.

Step 3: Biometrics

After filing, you get a receipt notice and then an appointment notice for biometrics at a USCIS Application Support Center. There, staff take your fingerprints, photograph and signature. The fingerprints are used for an FBI background check. Bring the appointment notice and your green card. If you cannot make the date, follow the instructions on the notice to reschedule; missing it without rescheduling can lead to your case being treated as abandoned.

Step 4: The interview

USCIS schedules an in-person interview at a field office. Processing times vary widely by office; the USCIS website lists current estimates by location.

At the interview:

1. You take an oath to tell the truth.
2. The officer goes through your N-400 with you, question by question. Bring updated information if anything has changed, such as a new address, a trip, a marriage or an arrest.
3. You take the English test: speaking (assessed during the conversation), reading (read a sentence aloud correctly) and writing (write a dictated sentence correctly).
4. You take the civics test: the officer asks questions aloud from an official list, and you answer aloud. Under the version long in use, the officer asks up to 10 questions from a published list of 100, and you must answer 6 correctly. In 2025, USCIS introduced a revised, longer version of the civics test for applications filed after a cutoff date. Check which version applies to your filing date and study from the official materials USCIS publishes for that version.

Bring: your interview notice, green card, passport and any travel documents, state ID, and originals of documents you submitted copies of. If an officer asks for more evidence, you may receive a written request with a deadline.

Step 5: Know the exemptions

The English requirement is waived if, when you file, you are:

1. 50 or older and have lived in the U.S. as a green card holder for 20 years, or
2. 55 or older with 15 years as a green card holder.

In those cases you still take the civics test, but you may take it in your own language with an interpreter you bring. Applicants 65 or older with 20 years as a green card holder get special consideration on the civics test, with a shorter study list.

People with a physical or developmental disability or mental impairment that prevents them from learning English or civics can ask for an exception using Form N-648, completed by a licensed medical professional. Reasonable accommodations, such as a sign language interpreter or extra time, can be requested in the application.

If you fail one part of a test, you get a second chance, usually within 60 to 90 days, on the part you failed.

Step 6: The decision

After the interview, the officer will give you a written notice with one of three outcomes:

1. Granted. Sometimes the oath can happen the same day; more often you receive a separate oath ceremony notice.
2. Continued. The case is on hold, usually for more documents or a retest.
3. Denied. You receive a written decision explaining why. You can ask for a hearing with another officer by filing Form N-336 within 30 days of the decision. After that, you can seek review in federal district court.

Step 7: The oath ceremony

You are not a citizen until you take the Oath of Allegiance at a ceremony, run by USCIS or by a federal court. Before the ceremony you complete a short questionnaire, Form N-445, about anything that has happened since your interview, such as travel or an arrest. You hand in your green card at check-in. After the oath, you receive your Certificate of Naturalization. Check it for errors before you leave.

Ceremonies are often moving in ways that surprise people: rooms full of families, dozens of countries called out one by one, new citizens waving small flags. They are the same ceremony, in spirit, that the 1790 law imagined, with the racial limit finally gone.

Step 8: After the oath

1. Apply for a U.S. passport. It is the most useful proof of citizenship.
2. Update your Social Security record, so your status is correct for work and benefits.
3. Register to vote. Some ceremonies offer registration on the spot. Otherwise, use the state-by-state voting guide for registration deadlines, voter ID rules and mail and early voting, linked to your state's election office.
4. File for family members. As a citizen you can petition for more relatives, and some wait times are shorter.

Where applications commonly go wrong

Most denials and delays come from a short list of problems. Check yourself against each before you file.

1. Long trips abroad. Add up every trip during the statutory period. A pattern of long stays outside the country can raise questions about continuous residence even if no single trip passed six months.
2. Taxes. Failing to file required federal tax returns, or describing yourself as a "nonresident" on a return to avoid taxes, can count against good moral character. If you owe taxes, a payment plan with the IRS and proof you are following it can help.
3. Selective Service. Men who lived in the U.S. as green card holders between their 18th and 26th birthdays were generally required to register with the Selective Service System. Failing to register can raise good moral character questions if you are still within the statutory period or cannot explain why you did not register.
4. Child support. Unpaid court-ordered support counts against you. Bring proof of payments or of an arrangement.
5. Old arrests. Every arrest and citation must be disclosed, including those dismissed, expunged or from when you were young. Bring certified court records. An expungement under state law does not always erase a conviction for immigration purposes.
6. False claims to citizenship and voting. Checking a "citizen" box on a job form or voter registration, or voting in a federal election before naturalizing, can have severe consequences. If any of this has happened, do not file until a lawyer has reviewed it.
7. Missing documents. An application that lacks a required copy or the right fee may be rejected or delayed. Make a checklist from the current N-400 instructions and tick each item.

What you can do

• If you are eligible, get a free screening. Many nonprofits and library systems hold citizenship workshops where volunteers and accredited representatives check eligibility and help fill out the N-400. Find groups by state under immigrants and legal aid in the organizations directory.
• If you are a citizen, volunteer. Citizenship classes need tutors for English and civics, and workshops need people to help with forms and logistics. A Saturday morning can move a neighbour toward the ballot box.
• Ask Congress about the cost and the backlog. Fees and processing time are shaped by funding decisions Congress makes. Use the representatives lookup to reach your members, and ask whether they support funding to cut naturalization waits and keep fee waivers.
• Follow changes to the rules. USCIS updates forms, fees and tests. The immigration and ICE topic page collects reporting on what has changed.

Avoid anyone who calls themselves a "notario" or immigration consultant but is not a licensed attorney or a representative accredited by the Justice Department. Their mistakes can cost far more than a fee.