U.S. Citizenship Requirements: The Complete 2025 Guide

The Five Core Requirements for Naturalization

To become a U.S. citizen through naturalization, you must satisfy five fundamental requirements established by the Immigration and Nationality Act (INA). These are: lawful permanent resident status for the required period, continuous residence in the United States, physical presence in the United States, good moral character, and the ability to read, write, and speak basic English along with a knowledge of U.S. history and government.

Each of these requirements has specific rules, exceptions, and nuances. Understanding them fully before you file Form N-400 will save you time, money, and potential heartbreak if your application is denied.

Requirement 1: Lawful Permanent Resident Status

You must be a lawful permanent resident (green card holder) to apply for naturalization. There is no minimum age requirement for filing N-400, but you must be at least 18 years old. Children under 18 may acquire citizenship automatically in certain circumstances when a parent naturalizes, under the Child Citizenship Act of 2000.

Your green card must be valid and in your possession. If your green card has expired, you should file Form I-90 to renew it before applying for naturalization, though an expired card does not affect your underlying status as a permanent resident.

Requirement 2: Continuous Residence

Most applicants must have been a permanent resident for at least five years before applying. Spouses of U.S. citizens who have been living in marital union with their citizen spouse for at least three years may apply after just three years of permanent residence, provided their spouse has been a U.S. citizen for all three of those years.

"Continuous residence" means that you have maintained your permanent resident status and have not abandoned your U.S. residence. A single trip abroad of more than six months — but less than one year — may disrupt your continuous residence. A trip of one year or more is presumed to have broken continuous residence entirely. If you have taken long trips abroad, you should consult an immigration attorney before filing.

Requirement 3: Physical Presence

In addition to continuous residence, you must have been physically present in the United States for at least 30 months out of the five years immediately preceding your application (or 18 months out of the three years for the spousal exception). Physical presence is calculated by counting the actual days you were in the United States — it is distinct from continuous residence.

Keep records of all your international travel, including dates of departure and return. USCIS will review your passport and travel history during the naturalization interview. Discrepancies between your stated travel history and your passport stamps can raise serious questions about your credibility.

Requirement 4: Good Moral Character

USCIS evaluates your moral character for the five years (or three years) immediately preceding your application. Certain criminal convictions are absolute bars to naturalization, including murder, aggravated felonies, and certain drug offenses. Other offenses — such as DUIs, theft, or assault — may or may not bar naturalization depending on the specific circumstances, the sentence imposed, and how much time has passed.

You are required to disclose all arrests, citations, and charges on your N-400, even if the charges were dropped, dismissed, or expunged. Failure to disclose is considered a misrepresentation and can result in denial and potential criminal charges. If you have any criminal history, consult an immigration attorney before filing.

Requirement 5: English and Civics

At your naturalization interview, a USCIS officer will test your ability to read, write, and speak English. The English test consists of reading one sentence aloud from a selection of sentences and writing one sentence dictated by the officer. The civics test consists of 10 questions drawn from a list of 100 possible questions about U.S. history and government. You must answer at least 6 of the 10 questions correctly to pass.

There are exceptions to the English requirement for applicants who are 50 years old or older and have been a permanent resident for at least 20 years, or who are 55 or older and have been a permanent resident for at least 15 years. These applicants may take the civics test in their native language with an interpreter. Applicants with qualifying medical disabilities may apply for an exemption from both the English and civics requirements by filing Form N-648.

The Naturalization Process Step by Step

Once you have confirmed that you meet all requirements, the process begins with filing Form N-400 along with supporting documents and the filing fee of $760 (plus $85 for biometrics, for a total of $845 for most applicants). After filing, you will receive a biometrics appointment notice, followed by an interview notice. At the interview, the USCIS officer will review your application, test your English and civics knowledge, and ask you questions about your background. If approved, you will receive a notice to appear at a naturalization ceremony, where you will take the Oath of Allegiance and receive your Certificate of Naturalization.