Path to Citizenship: How Naturalization Works

With narrow exceptions for military service, an applicant must be at least 18 years old and already hold lawful permanent resident status, commonly known as a green card, before applying to naturalize. Naturalization is not a first step into the immigration system; it is the final step, available only after someone has already been a permanent resident for a required period of time.

Children generally do not apply for naturalization on their own. Instead, many acquire U.S. citizenship automatically when a parent naturalizes, under the Child Citizenship Act of 2000, without a separate application or civics test, provided the child is under 18, a lawful permanent resident, and living in the parent's legal and physical custody at the time.

Lawful permanent residence is itself obtained through a separate process, a family or employment petition, the diversity visa lottery, or asylum or refugee adjustment, that can take years. DHS data show the typical immigrant who naturalized in recent years had held a green card for about seven years first.

The Child Citizenship Act of 2000 replaced an older system requiring each child of a naturalizing parent to be naturalized individually. Children who do not acquire citizenship automatically, for example those who turned 18 before a parent naturalized, must file their own N-400 once eligible.

Most applicants must have held lawful permanent resident status continuously for at least five years before applying, and must have been physically present in the United States for at least half of that period, a distinct requirement from continuous residence that USCIS calculates separately using actual travel dates.

The residency requirement shortens to three years for green card holders who have been married to, and living with, a U.S. citizen spouse for that entire three-year period. Trips outside the United States lasting six months or longer can legally interrupt continuous residence, potentially requiring an applicant to restart the residency clock, which is why USCIS asks applicants to list every trip abroad on the naturalization application.

USCIS tracks three separate clocks: continuous residence (the unbroken period as a permanent resident), physical presence (total days actually in the country, at least 30 months of the 5 years), and residence in the applicant's state or USCIS district (at least 3 months). An absence of a year or more breaks continuous residence outright, absent an approved exception.

Certain workers abroad, employees of the U.S. government, recognized American research institutions, or U.S. firms engaged in foreign trade, and some clergy, can file Form N-470 to preserve continuous residence during long overseas assignments. Service members and their spouses have their own, more generous rules.

Applicants must demonstrate good moral character during the statutory residency period, a legal standard defined in the Immigration and Nationality Act rather than left to case-by-case impression alone. Certain convictions, including aggravated felonies at any point in an applicant's history and specific crimes committed during the statutory period, automatically bar a finding of good moral character.

The good moral character review also covers conduct beyond criminal history, including whether an applicant paid required taxes and complied with any court-ordered child support obligations, and whether they answered every application question truthfully. USCIS officers have denied applications specifically for providing false information during the interview, even when the underlying fact misrepresented would not itself have disqualified the applicant.

The INA lists permanent bars, chiefly a conviction for an aggravated felony on or after November 29, 1990, and murder at any time, and conditional bars that block a finding only if the conduct occurred during the statutory period, such as most controlled-substance offenses, two or more gambling offenses, or income drawn mainly from illegal gambling.

Officers may also weigh conduct outside the statutory period and consider positive factors like family ties, steady employment, and community involvement. A knowing and willful failure to register for the Selective Service, required of most men aged 18 to 25, can also count against a good moral character finding.

Applicants must demonstrate a basic ability to read, write, and speak English, and must pass a civics test on U.S. history and government, both administered by a USCIS officer during the naturalization interview. The specific content and structure of the civics and English tests are covered in detail in this page's Civics & English Test tab.

Certain older, long-term permanent residents qualify for age- and residency-based exemptions from the English requirement, and applicants with a qualifying medical disability can request a full waiver of both the English and civics requirements using a doctor-certified form, both also detailed in the Civics & English Test tab.

The reading and writing tests draw on short published vocabulary lists organized by civics themes, and the speaking ability is judged from the applicant's answers to the officer's questions about the N-400 itself rather than a separate scripted section. Applicants who fail any tested component get one retest, generally 60 to 90 days later.

The "50/20" and "55/15" rules let older long-term residents take the entire process in their native language with an interpreter, and the "65/20" rule cuts the study list to 20 questions. A medical waiver on Form N-648, signed by a licensed medical professional, can remove the English and civics requirements entirely for a qualifying disability.

Federal law requires applicants to be "attached to the principles of the Constitution" and "well disposed to the good order and happiness" of the United States, a standard that traces back to the Nationality Act of 1940 and is assessed through the application and interview process rather than through any single dedicated test.

This is also the legal basis for the Oath of Allegiance requirement at the end of the process: new citizens must swear to support and defend the Constitution. Applicants with sincere religious or moral objections to bearing arms can request a modified oath that omits those specific clauses while still affirming loyalty to the Constitution, discussed further in the Application Process tab.

Courts have read the attachment standard to bar naturalization of applicants who, during the statutory period, advocated overthrowing the government by force or belonged to a totalitarian party, provisions rooted in the anti-communist climate of the 1940s and 1950s and still in the statute.

In practice the requirement is assessed through the application questions and interview rather than a distinct test, and denials on attachment grounds are rare. The oath at the end of the process is the moment the applicant formally affirms that attachment, promising to support and defend the Constitution against all enemies.

Members of the U.S. armed forces qualify for significantly relaxed naturalization rules. Under the Immigration and Nationality Act, honorable service during a designated period of hostilities, including the current period covering the war on terrorism, allows immediate naturalization eligibility with no minimum residency period at all, even for service members stationed entirely overseas.

Service members naturalizing under these provisions can complete the entire process, including the interview and oath, at U.S. military installations and consular posts abroad, and USCIS waives the standard application fee for military applicants. Service members who die as a result of injury or disease incurred during active-duty service can also be granted posthumous citizenship under a separate provision of the same law.

Peacetime military naturalization under Section 328 of the INA still shortens the residency requirement to one year of honorable service and waives some fees. Wartime naturalization under Section 329, triggered by a presidential executive order designating a period of hostilities, which has run continuously since September 11, 2001, removes the permanent-residence and minimum-residency requirements altogether.

Posthumous citizenship under Section 329A can be granted within two years of a service member's death from service-connected injury or illness, on request of next of kin, after which certain immediate family members may become eligible for immigration benefits of their own.

The naturalization process formally begins when an eligible applicant files Form N-400, Application for Naturalization, with USCIS, either online through a USCIS account or by mail, along with supporting documents such as the green card, tax records, and, where relevant, marriage or military service records.

Under the fee rule that took effect April 1, 2024, the standard filing fee is $710 online ($760 for paper filing), though USCIS periodically adjusts fees through the federal rulemaking process, and applicants who meet specific low-income thresholds can request a full or partial fee waiver using a separate form filed alongside the N-400.

The N-400 runs about 20 pages, asking for the full residence and employment history for the past five years, every trip abroad of 24 hours or more, marital history, tax compliance, and a long list of yes/no eligibility questions on criminal history, group memberships, and prior immigration violations. Answering falsely is itself grounds for denial and, later, denaturalization.

Applicants may file up to 90 days before completing the required residency period, a window Congress added so decisions can be ready near the eligibility date. USCIS reported a median N-400 processing time of roughly 5 to 6 months in fiscal year 2023, down from a peak near 12 months in 2018, though times vary widely by field office.

After filing, most applicants receive a notice to appear at a local Application Support Center for a biometrics appointment, where USCIS collects fingerprints, a photograph, and a signature. Some applicants, generally those age 75 and older, are exempt from the fingerprinting portion of this step.

The fingerprints are run through both FBI criminal history databases and immigration records checks, a background screening process that forms part of the good moral character and national security review required before any application can be approved, and results from this step feed directly into the later interview and decision stages.

Since 2021 USCIS has reused fingerprints already on file for many green-card holders, letting it waive a separate biometrics appointment in a large share of naturalization cases and speeding up processing. Applicants who still need an appointment are usually scheduled within a few weeks of filing.

The background check combines an FBI fingerprint check, an FBI name check, and an interagency records review. A cleared or "no record" result is required before approval, and unresolved checks were a major driver of the processing delays Congress examined in 2017 and 2018.

A USCIS officer interviews every applicant individually, under oath, reviewing the N-400 application for accuracy and asking follow-up questions about the applicant's background, residency history, and eligibility. The English and civics tests, covered in detail in the next tab, are administered as part of this same interview, not as a separate appointment.

The interview typically lasts well under an hour, but wait times to actually receive an interview appointment have varied considerably over the years, covered further in the Trends & Legal Changes tab. Applicants who fail either the English or civics portion on their first attempt are given one additional opportunity to retest, usually scheduled 60 to 90 days later, before the application can be denied on those grounds.

The officer places the applicant under oath, tests English informally through conversation, administers the reading and writing sentences, and asks the civics questions: for applications filed on or after October 20, 2025, up to 20 questions from a 128-question pool, stopping at 12 correct or 9 wrong; earlier applicants take the 2008 test (up to 10 of 100 questions, 6 correct to pass). The officer also walks through the N-400 line by line, updating anything that has changed since filing, such as new trips abroad or a new address.

Applicants may bring an attorney or accredited representative, and interpreters are allowed only for those exempt from the English requirement. If everything passes and the file is clear, the officer can recommend approval the same day; otherwise the case is "continued" for a retest or additional evidence, usually with a Form N-14 listing what is needed.

Following the interview, USCIS issues one of three outcomes: approval, a "continued" status requesting additional evidence or a retest, or denial. Most straightforward applications receive a decision the same day as the interview, though complex cases involving additional background checks can take considerably longer.

Applicants whose naturalization is denied have the right to request a formal hearing before a different USCIS officer, and, if still denied, can further appeal to a U.S. district court, one of the relatively few areas of immigration law where a federal judge, rather than an immigration agency alone, has the final say.

By statute USCIS must decide an application within 120 days of the interview. If it does not, the applicant can ask a federal district court to decide the case directly or order the agency to act, under Section 336(b) of the INA, one of the few immigration matters a federal court can take over from the agency.

A denial notice must state the specific reasons. The applicant has 30 days to request a hearing before a different, senior USCIS officer using Form N-336; if that too ends in denial, the applicant may seek review in federal district court, which considers the case anew rather than merely reviewing the agency record.

Naturalization is not legally complete until an approved applicant takes the Oath of Allegiance at an official ceremony, administered either by USCIS itself or, less commonly today, by a federal or state court. The oath requires new citizens to renounce allegiance to any foreign state, support and defend the Constitution, and, unless modified for religious or moral objectors, bear arms or perform noncombatant service on behalf of the United States if required by law.

Ceremonies range from small USCIS office gatherings of a few dozen people to large public events; USCIS regularly holds ceremonies at symbolically chosen sites such as the National Archives, national parks, and, on and around July 4th, hundreds of special ceremonies nationwide. A naturalized citizen receives a Certificate of Naturalization at the ceremony, the official legal proof of citizenship.

USCIS administers the great majority of oath ceremonies itself; in about 30 jurisdictions federal courts keep exclusive authority to naturalize and hold their own. Ceremonies have run at sites like Monticello, Mount Vernon, and Yosemite, and at stadiums where thousands are sworn in at once.

At the ceremony the new citizen surrenders the green card, takes the oath, and receives the Certificate of Naturalization. USCIS naturalized about 878,000 people in fiscal year 2023; the single-year record is roughly 1,046,000, set in fiscal year 2008.

Citizenship takes legal effect the moment a new citizen takes the oath, not at some later administrative date, which means new citizens gain the right to vote in federal elections, serve on federal juries, and run for any elected office except President and Vice President, immediately.

New citizens can also apply for a U.S. passport right away and, unlike permanent residents, can no longer be deported for most criminal convictions, though naturalized citizenship can still be revoked in rare denaturalization cases, discussed in the Trends & Legal Changes tab, generally limited to citizenship obtained through fraud or concealment of a disqualifying fact.

New citizens can also petition for certain relatives to immigrate on shorter timelines than permanent residents can, hold most federal jobs and security clearances, and stop carrying a green card. The one office the Constitution keeps from them is the presidency and vice presidency, reserved for the natural-born.

Dual citizenship is permitted under U.S. law, and the oath's renunciation clause is not enforced against the new citizen's other nationality in practice. Denaturalization requires a federal court to find that citizenship was "illegally procured" or obtained by "concealment of a material fact or willful misrepresentation," a standard the Supreme Court tightened in Maslenjak v. United States (2017).

USCIS publishes a public study list of possible civics questions covering American government, history, and geography, questions such as naming the supreme law of the land or the number of amendments to the Constitution. Under the 2025 civics test, which applies to applications filed on or after October 20, 2025, the list has 128 questions, the officer asks up to 20, and an applicant must answer 12 correctly; applicants who filed earlier take the 2008 test, which asks up to 10 of 100 questions and requires 6 correct.

Because the full question list is published in advance, USCIS treats it primarily as a knowledge test rather than a test of memorization under pressure, and the questions and official study materials are freely available in multiple languages and in a fillable-flashcard format on the USCIS website for applicants preparing at home.

The questions are grouped into American Government, American History, and Integrated Civics (geography, symbols, holidays). A few answers, such as a state's current governor or U.S. senators, change by location and over time, and USCIS updates the official answer key accordingly.

Applicants 65 or older with 20 years of permanent residence study only 20 designated questions marked with an asterisk. Nationwide first-attempt pass rates for the civics test have historically been above 90 percent, which USCIS credits to the study list being public and widely taught in citizenship-preparation classes run by libraries, community colleges, and nonprofits.

The English test has three components, all assessed by the interviewing officer rather than through a separate written exam: reading one sentence aloud correctly from a list of USCIS-approved vocabulary, writing one sentence correctly from dictation, and speaking, which USCIS evaluates informally throughout the interview based on the applicant's ability to answer questions about the N-400 application itself.

There is no minimum vocabulary size required beyond the specific reading and writing vocabulary lists USCIS publishes, and applicants are given up to three opportunities each on the reading and writing portions during a single interview attempt before that specific component is marked as failed.

The reading vocabulary list has roughly 90 words and the writing list a similar number, both drawn from civics and history topics so that preparation overlaps with the civics test itself.

Spelling and grammar errors are allowed on the writing test as long as the sentence remains understandable; the reading test requires conveying the meaning without long pauses or major mispronunciations. An applicant who fails a component gets one retest at a second interview before denial on English grounds.

The civics test was informal and highly subjective for most of the 20th century, with no standard question list and wide variation between different USCIS offices and officers. The agency introduced the first standardized 100-question test in the 1980s and significantly redesigned it in 2008 to emphasize understanding of civic concepts over rote memorization of isolated facts, the version that remained in place for over a decade.

In December 2020, USCIS introduced a longer, harder revision requiring 12 of 20 questions correct from a 128-question pool. The agency suspended that version just two months later, in February 2021, citing concerns it could reduce access to naturalization for some applicants, and formally reverted to the 2008 test, which was used until the 2025 test replaced it for applications filed on or after October 20, 2025, discussed further in the Trends & Legal Changes tab.

Before standardization, an applicant might be asked anything from naming the president to explaining the Constitution, with the outcome left largely to the individual examiner. Complaints about inconsistency led USCIS's predecessor to pilot a fixed question set in the 1980s and to commission a multi-year redesign completed in 2008.

That 2008 redesign was developed with input from English-language and civics educators and pretested on volunteer applicants. It moved away from trivia toward concepts, asking why the colonists fought the British or what the rule of law means, and it is the version USCIS returned to in February 2021.

Longtime permanent residents who meet specific age and residency combinations can take the civics test in their native language, using an interpreter, rather than in English: applicants age 50 or older with at least 20 years as a permanent resident, or age 55 or older with at least 15 years as a permanent resident, qualify for this exemption from the English test entirely, though they must still pass the civics test itself.

A further exemption, sometimes called the "65/20" rule, applies to applicants age 65 or older with at least 20 years of permanent residence: they may study a shorter list of just 20 of the 100 civics questions, marked specifically for this purpose in USCIS's official study materials, while still needing to answer 6 of the 10 asked correctly (under the 2008 test).

The exemptions recognize that older, long-settled residents may have limited English yet be thoroughly integrated. Applicants using the "50/20" or "55/15" rule take the whole process, including the civics test, in a language of their choice with an interpreter they bring.

These applicants still must pass the civics test on its merits, still show good moral character and continuous residence, and still take the oath. USCIS provides official civics study materials in Spanish, Chinese, Vietnamese, Tagalog, and other languages for applicants using these exemptions.

Applicants with a medically determinable physical or developmental disability, or mental impairment, that has lasted or is expected to last at least 12 months can request a full waiver of the English and civics requirements using Form N-648, which must be completed and certified by a licensed medical professional familiar with the applicant's condition.

The waiver does not exempt an applicant from the interview itself or from other eligibility requirements such as continuous residence and good moral character; it removes only the English and civics testing components specifically, and USCIS officers receive specialized training to conduct interviews respectfully and appropriately for applicants using this waiver.

Form N-648 must be signed by a licensed doctor, doctor of osteopathy, or clinical psychologist within a set window before filing, and must explain in plain terms how the condition prevents the applicant from learning or showing English or civics knowledge. The USCIS officer, not the doctor, makes the final decision on the waiver.

USCIS revised the form in 2022 to make it shorter and clearer after advocacy groups reported that high denial rates were often tied to incomplete medical explanations rather than ineligible applicants.

Applicants with sincere religious training and belief, or a deeply held moral or ethical conviction against bearing arms, can request a modified Oath of Allegiance that omits the clauses committing new citizens to bear arms or perform noncombatant military service, while still requiring the core promises to support and defend the Constitution and renounce foreign allegiance.

USCIS requires applicants requesting this modification to submit supporting evidence of their beliefs along with the N-400 application, and officers evaluate these requests individually rather than granting them automatically to any applicant who checks a box, a process rooted in decades of federal court decisions defining what counts as a sincerely held objection under immigration law.

The modified oath traces to Girouard v. United States (1946), in which the Supreme Court held that a Seventh-day Adventist could be naturalized despite refusing to bear arms, overruling earlier decisions. Congress wrote the accommodation into the Immigration and Nationality Act in 1952.

An applicant seeking the modification submits a written explanation and supporting evidence with the N-400, and the officer weighs sincerity case by case using long-standing conscientious-objector case law. The promises to support the Constitution and renounce foreign allegiance cannot be waived; only the military-service clauses can.