How to Become a US Citizen: Naturalization Requirements and the Application Process

Becoming a United States citizen through naturalization is a significant legal process with specific requirements that must be met precisely. USCIS, the agency that processes citizenship applications, reviews thousands of cases and has little tolerance for incomplete or incorrect submissions. Understanding what is required before you apply, how the process unfolds, and what can delay or prevent approval saves time, money, and significant frustration.

Naturalization is not the only path to citizenship. Children born abroad to US citizens may acquire citizenship automatically. People born in the United States are citizens by birthright. But for permanent residents who came to the US as adults and want to become citizens, naturalization is the path, and this guide covers that process in detail. Before you apply, use our immigration fee calculator to total the application costs involved.

The Five Year Continuous Residence Requirement

Most permanent residents must maintain continuous residence in the United States for at least five years before applying for citizenship. Continuous residence does not mean you cannot leave the country. It means you have maintained your primary residence in the US throughout the period and have not abandoned your green card by moving abroad.

Trips outside the United States for six months or more create a presumption that you broke continuous residence. A single trip under six months will not automatically break residence but may still raise questions if you were out of the country frequently or had ties abroad suggesting you were not actually living in the US. Absences of one year or more generally break continuous residence entirely and require restarting the clock, though there are exceptions for certain US government employees and their families.

Physical presence is a separate requirement. You must have been physically present in the United States for at least 30 months out of the five years immediately before filing. This is calculated precisely based on entry and exit records. USCIS obtains this information from CBP and can verify your travel history independently, so accurate reporting on your application is essential.

The Three Year Rule for Spouses of Citizens

Permanent residents who are married to and living with a US citizen can apply for naturalization after only three years of permanent residence instead of five. This shortened timeline requires that you have been married to and living with the same US citizen for all three years before filing, that your spouse has been a US citizen throughout that period, and that you meet all other eligibility requirements.

The physical presence requirement is proportionally reduced for the three-year path. You must have been physically present in the United States for at least 18 months out of the three years before filing.

Age and the Civics Test Requirement

Applicants 18 years of age and older must pass a civics test and an English language test as part of the naturalization interview. The civics test covers US history and government. USCIS provides a list of 100 possible questions, and the officer asks up to ten of them during the interview. You must answer six out of ten correctly to pass.

The English language requirement assesses your ability to read, write, and speak basic English. The officer evaluates your speaking ability during the interview conversation itself. Reading is tested by asking you to read a sentence or two from a list of sentences. Writing is tested by asking you to write a sentence the officer dictates. You get three chances to pass each component.

Exemptions apply for applicants who are 50 years old or older and have been permanent residents for at least 20 years, or who are 55 or older with at least 15 years of permanent residence. These applicants may take the civics test in their native language with a translator. Applicants with certain medical conditions that prevent them from meeting the English or civics requirements may qualify for a medical exception.

Good Moral Character Requirement

You must demonstrate good moral character during the five years before your application, or three years if applying on the spousal track. USCIS defines good moral character by what you have not done rather than by what you have done. Criminal history is the most significant concern.

Certain convictions permanently bar naturalization. These include murder, an aggravated felony conviction since November 29, 1990, and being a member of or affiliated with certain totalitarian or terrorist organizations. Other offenses create a statutory bar that prevents naturalization during or for a period after the offense, including most felony convictions, two or more offenses with a combined sentence of five or more years, drug trafficking, prostitution-related offenses, and certain immigration violations.

Minor criminal history does not automatically disqualify you, but it requires careful disclosure and evaluation. Even arrests that did not result in conviction must be disclosed on the N-400 application. Failing to disclose criminal history is itself a basis for denial and can constitute fraud, which creates far more serious problems than the underlying offense would have.

Filing Form N-400: The Application for Naturalization

The naturalization application is Form N-400, Application for Naturalization. The filing fee as of 2025 is $760 for applicants filing by mail and $710 for online filers. A biometric services fee of $85 is also charged for most applicants under 79 years old. Fee waivers are available for applicants with income at or below 150 percent of the federal poverty level.

The N-400 is a detailed form asking about your personal history, residence history, travel history, employment history, marital history, criminal history, and affiliations. Accuracy matters enormously. USCIS cross-references your answers against tax records, Social Security records, CBP travel records, and criminal justice databases. Inconsistencies between your application and these records will generate questions at best and a fraud finding at worst.

Supporting documents required with the N-400 include a copy of your permanent resident card, two passport-style photos, any court records for criminal history if applicable, and evidence of marriage if applying on the spousal track. Some applicants are also asked to provide additional documentation during the review process.

The Naturalization Interview

After submitting your application, USCIS will schedule a biometrics appointment where fingerprints and photos are taken. A few months later, you will receive notice of an interview appointment at your local USCIS field office. The interview is conducted by an immigration officer who reviews your application, asks questions about your background and history, and administers the English and civics tests.

Bring your original green card, your passport, your N-400 interview notice, and any documents USCIS has requested. Answer questions honestly and ask for clarification if you do not understand a question rather than guessing. The officer is evaluating your credibility as well as your eligibility. Appearing uncertain about your own personal history or giving inconsistent answers raises concerns regardless of the underlying substance.

How Long the Naturalization Process Takes

Processing times for naturalization applications vary significantly by field office and fluctuate with application volume. In recent years, processing times have ranged from eight months to well over a year. The USCIS website publishes current estimated processing times by field office, and you can check your specific case status online after filing.

After approval at the interview, you will be scheduled for a naturalization ceremony where you take the Oath of Allegiance and receive your Certificate of Naturalization. Ceremonies may occur the same day as your interview in some offices, or weeks later in others. Once you take the oath and receive your certificate, you are a US citizen and can apply for a US passport.

What Naturalization Cannot Help You With

Naturalization resolves your immigration status permanently, but it does not retroactively eliminate consequences from prior immigration violations in all contexts. Some federal employment positions and security clearances consider your immigration history even after you become a citizen. Professional licenses in some states also consider immigration background during the application period.

Citizens can still face deportation in extremely rare circumstances involving fraud in the naturalization process itself. If USCIS can prove you obtained citizenship through willful misrepresentation of a material fact, denaturalization is possible through a civil court proceeding. This is uncommon but worth knowing, particularly for applicants who are tempted to omit unflattering but truthful information from their applications.